Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

sgl_imaging_challenge_celestial_motion.thumb.jpg.a9e9349c45f96ed7928eb32f1baf76ed.jpg

Recommended Posts

Dilemna time......

I've realised that I'm not a fan of barlows, I'm also not loaded with cash. I love my two BST's 8mm and 25mm, I'm not so keen on my 15mm meade.

I've recently expanded my scope collection due to some inheritance with a 127 Mak, so my question is what would be a benefit to my eyepieces, replace the 15mm with a BST? Go lower than my 8mm? Go higher than 25mm? With BST's I would easily get two below £100 or go for something different and spend up to £100 on one eyepiece? Have a wide range of focal lengths and ratios over my three scopes, do I plan for different eyepieces per scope or stick to common eyepieces? Before anyone suggests Televues, I'll need to spend a fair bit on the wife before they turn up in the post? unless of course someone knows of deals going round

Share this post


Link to post
Share on other sites
Posted (edited)

There are 4, 7 and 16 mm Nirvana eyepieces (82°) available that might fit the bill. I have a 16 mm and it is a really nice eyepiece. Better than anything you currently have, I guess.

see here: https://www.firstlightoptics.com/ovl-eyepieces/ovl-nirvana-es-uwa-82-ultrawide-eyepieces.html

 

 

 

Edited by Ruud
  • Like 2

Share this post


Link to post
Share on other sites
22 minutes ago, Ruud said:

There are 4, 7 and 16 mm Nirvana eyepieces (82°) available that might fit the bill. I have a 16 mm and it is a really nice eyepiece. Better than anything you currently have, I guess.

see here: https://www.firstlightoptics.com/ovl-eyepieces/ovl-nirvana-es-uwa-82-ultrawide-eyepieces.html

 

 

 

16mm sounds good, would the 4mm be a stretch on magnification with my scopes?

Share this post


Link to post
Share on other sites
14 minutes ago, DavidJM said:

16mm sounds good, would the 4mm be a stretch on magnification with my scopes?

Not on the two Dobs as long as their figures are good.  However, I wouldn't typically go above 5mm on the 200P.  Never having had an f/4 scope, I can't advise there.  It comes down to a matter of how well corrected it is.  If it had a Zambuto level of correction primary, I'd say go for it for sure.  However, commercial grade fast primaries are rarely figured that finely, so very high powers may not be possible.  Besides, you've got plenty of other scope options for higher powers.

I would go for a widest field 2" eyepiece for the 200P Dob since you don't have anything below 25mm.  Something like the 35mm OVL Aero ED.  It works really well in my 8" Dob (with a GSO/Revelation coma corrector).

  • Like 1

Share this post


Link to post
Share on other sites

4mm should be usable on f/8 and faster, but you also have to consider how much magnification the atmosphere allows.

I'll include my telescope and eyepiece spreadsheet. I prefer exit pupils between 1 and 5 mm, but on solar system targets I will go down to 0.5 mm. The atmosphere rarely allows magnifications over 250x here.

Especially when the telescope has a central obstruction, the exit pupil should not be larger than your own pupil (that's when the shadow of the secondary begins to fill your pupil, while at the same time the illuminated part of the exit pupil begins to get blocked by your iris).

ScopeCalculatorV2.xlsx

Stellariun has a nice oculars plugin. Try it. It'll help you estimate the sort of views you get from any prospective eyepiece.

  • Like 1

Share this post


Link to post
Share on other sites
7 hours ago, Ruud said:

4mm should be usable on f/8 and faster, but you also have to consider how much magnification the atmosphere allows.

I'll include my telescope and eyepiece spreadsheet. I prefer exit pupils between 1 and 5 mm, but on solar system targets I will go down to 0.5 mm. The atmosphere rarely allows magnifications over 250x here.

Especially when the telescope has a central obstruction, the exit pupil should not be larger than your own pupil (that's when the shadow of the secondary begins to fill your pupil, while at the same time the illuminated part of the exit pupil begins to get blocked by your iris).

ScopeCalculatorV2.xlsx 254.22 kB · 4 downloads

Stellariun has a nice oculars plugin. Try it. It'll help you estimate the sort of views you get from any prospective eyepiece.

Thanks for the spreadsheet, hadn't thought of Stellarium

Share this post


Link to post
Share on other sites

A 4mm in an 8" F/6 scope is roughly equivalent to a 7mm in my 8" F/10 SCT. I use the latter quite a lot on lunar and planetary observing. Should be useful.

  • Like 1

Share this post


Link to post
Share on other sites

The problem of having multiple scopes (a nice problem to have) is having the smallest number of EPs that are usable in all scopes. I figure you could use a higher power EP for good nights with the 8" Dob (5/6mm - ish)  but that may well be too much for the mak. The Nirvana has been mentioned and I'd second that, the 7mm I have is brilliant, and based on that a 16mm Nirvana would be a good replacement for your Meade.  If super wide isn't your thing then the Vixen SLVs are very good. Bottom line is that a couple of EPs would be good! 

  • Like 1

Share this post


Link to post
Share on other sites

At some point I gave up having EPs that would be useful in ALL scopes in the house (from F/5 to F/10). My XW 5mm (and SLV 5mm) work fine in the APM 80mm F/6 or ST80, but only make occasional appearances in the C8 at F/10 (and then only for the moon). By contrast, the LVW 42 mm works fine in the C8 but only works in the APM 80mm F/6 if skies are particularly dark, due to the 7mm exit pupil. The Nagler 31T5 (a.k.a. Panzerfaust) is much better in the latter scope.

One thing to consider is the eye relief. The BSTs have decent eye relief, I believe the shorter Nirvanas don't. If you wear glasses their eye relief might be too tight.

  • Like 3

Share this post


Link to post
Share on other sites
3 hours ago, michael.h.f.wilkinson said:

At some point I gave up having EPs that would be useful in ALL scopes in the house (from F/5 to F/10). My XW 5mm (and SLV 5mm) work fine in the APM 80mm F/6 or ST80, but only make occasional appearances in the C8 at F/10 (and then only for the moon). By contrast, the LVW 42 mm works fine in the C8 but only works in the APM 80mm F/6 if skies are particularly dark, due to the 7mm exit pupil. The Nagler 31T5 (a.k.a. Panzerfaust) is much better in the latter scope.

One thing to consider is the eye relief. The BSTs have decent eye relief, I believe the shorter Nirvanas don't. If you wear glasses their eye relief might be too tight.

I think that its inevitable that with 'scopes of differing focal lengths/apertures/ratios not all EPs will work with all scopes, and this is certainly so for me. However, I'm always mindful when contemplating buying an EP as to getting the best out of it in terms usage and with respect to this my comment "having the smallest number of EPs that are usable in all scopes" was probably badly worded! The 16mm Nirvana's eye relief is given as 12mm and I would agree that for use with specs' it  might be just a tad tight. I'm fortunate in that although I wear specs' I don't need them at the eyepiece and find the 7mm Nirvana nicely comfortable to use.

Share this post


Link to post
Share on other sites
1 hour ago, Alfian said:

I think that its inevitable that with 'scopes of differing focal lengths/apertures/ratios not all EPs will work with all scopes, and this is certainly so for me. However, I'm always mindful when contemplating buying an EP as to getting the best out of it in terms usage and with respect to this my comment "having the smallest number of EPs that are usable in all scopes" was probably badly worded! The 16mm Nirvana's eye relief is given as 12mm and I would agree that for use with specs' it  might be just a tad tight. I'm fortunate in that although I wear specs' I don't need them at the eyepiece and find the 7mm Nirvana nicely comfortable to use.

Hi Ian

I have specs for reading but don't use with scopes (at the moment), the Nirvana's certainly seem to be getting good responses, will likely go for the 16mm to replace the Meade, that will likely spur more purchase ideas knowing me 

  • Like 1

Share this post


Link to post
Share on other sites

If there's nothing physically wrong with the Meade, I'd fill the gaps before replacing eye pieces and the it would be the 10mm SW that would go first!

You can't really have too many eyepieces at the shorter focal lengths as the small change in mm has a much bigger impact on magnification.

I don't know about the others, but a 6mm rather than a 4mm would be more use in the 8". :)

  • Like 2

Share this post


Link to post
Share on other sites
1 hour ago, bingevader said:

If there's nothing physically wrong with the Meade, I'd fill the gaps before replacing eye pieces and the it would be the 10mm SW that would go first!

You can't really have too many eyepieces at the shorter focal lengths as the small change in mm has a much bigger impact on magnification.

I don't know about the others, but a 6mm rather than a 4mm would be more use in the 8". :)

Hi Ben, that's a really good point, I don't use the SW standard eyepieces I had with my scope, hadn't considered that a 10mm and an 8mm would give more options

Share this post


Link to post
Share on other sites
Posted (edited)
11 hours ago, michael.h.f.wilkinson said:

At some point I gave up having EPs that would be useful in ALL scopes in the house (from F/5 to F/10). My XW 5mm (and SLV 5mm) work fine in the APM 80mm F/6 or ST80, but only make occasional appearances in the C8 at F/10 (and then only for the moon). By contrast, the LVW 42 mm works fine in the C8 but only works in the APM 80mm F/6 if skies are particularly dark, due to the 7mm exit pupil. The Nagler 31T5 (a.k.a. Panzerfaust) is much better in the latter scope.

One thing to consider is the eye relief. The BSTs have decent eye relief, I believe the shorter Nirvanas don't. If you wear glasses their eye relief might be too tight.

Starting out, I would pick my eyepieces first of all for the scope I use for serious viewing, not the most used scope.  While it's true I have used my small 5 inch Dob more than the bigger 10 inch over the years , it has been totally worth it  to optimise my set around the bigger scope first of all. The smaller scope has mostly been a secondary consideration in my choice.  

It is often said that 3 magnifications for each scope will go a long way, something in the range of high, medium and low power, I think there is a lot of truth in that.

Edited by AlexB67
  • Like 1

Share this post


Link to post
Share on other sites

In my opinion, barlows are great with zoom eyepieces. 

  • Like 2

Share this post


Link to post
Share on other sites

There is a lot of good advice in the above posts. They do though demonstrate that an eyepiece to suit one user, does not necessarily suit another.

May I suggest a strategy to reduce risk?

Buy used eyepieces from SGL members. Look in the 'for sale' section.
Items there are generally in good condition, or like new. If not, the descriptions are generally honest.
An eyepiece in good order is going to be about 2/3 of new price.

Try out your almost new eyepiece(s).
If they work out well, keep them.
If they don't work out well, sell them on.

By doing this your cost is basically postage. The sale price from you is going to be similar to your purchase price - unless you have degraded the eyepiece.

When uncertain about any astro kit, I always try to buy used. Sometimes it can take a while to complete a sale on something that does not work out.

Hope this helps, David.

 

  • Like 2

Share this post


Link to post
Share on other sites
7 hours ago, Carbon Brush said:

There is a lot of good advice in the above posts. They do though demonstrate that an eyepiece to suit one user, does not necessarily suit another.

May I suggest a strategy to reduce risk?

Buy used eyepieces from SGL members. Look in the 'for sale' section.
Items there are generally in good condition, or like new. If not, the descriptions are generally honest.
An eyepiece in good order is going to be about 2/3 of new price.

Try out your almost new eyepiece(s).
If they work out well, keep them.
If they don't work out well, sell them on.

By doing this your cost is basically postage. The sale price from you is going to be similar to your purchase price - unless you have degraded the eyepiece.

When uncertain about any astro kit, I always try to buy used. Sometimes it can take a while to complete a sale on something that does not work out.

Hope this helps, David.

 

Great advice, tbh I do tend to look at second hand, that's how I got my 200P, 2/3 price seems to be the recommendation, have to say I'm a bit of a squirrel and tend to struggle to let go of things☺

Share this post


Link to post
Share on other sites
On 23/03/2019 at 12:00, DavidJM said:

have to say I'm a bit of a squirrel and tend to struggle to let go of things

If you don't really need the money and have a place to store them properly, go ahead and be a pack rat.  I tend to only sell on large or very expensive things I no longer use.  Cars and furniture come to mind.  Houses can be rented out, so selling them on isn't always the right answer in a growth market.

  • Like 1

Share this post


Link to post
Share on other sites

So rightly or wrongly I've ordered a couple more BST starguiders because the two I have have given so much pleasure, and have set my sights on getting a second hand televue plossl; I've only recently added my 127 Mak and have found the 25mm BST pretty good but still love my faster scopes and really want to test out with a tv, also 32mm tv plossl maybe useful with the Mak, just need to decide on focal length, more decisions?

Share this post


Link to post
Share on other sites

If you go for a Tele Vue 32mm plossl, budget for an eye guard extender as well:

https://www.firstlightoptics.com/tele-vue-eyepieces/tele-vue-twist-on-style-eyeguard-extender.html

Without the extender, you can find the eye relief of the 32mm TV plossl hard to hold. With the extender the eyepiece becomes really comfortable and easy to use.

Share this post


Link to post
Share on other sites
7 hours ago, John said:

If you go for a Tele Vue 32mm plossl, budget for an eye guard extender as well:

https://www.firstlightoptics.com/tele-vue-eyepieces/tele-vue-twist-on-style-eyeguard-extender.html

Without the extender, you can find the eye relief of the 32mm TV plossl hard to hold. With the extender the eyepiece becomes really comfortable and easy to use.

Thanks John, I'm learning ever day ☺

Share this post


Link to post
Share on other sites

Also, be aware that the BST Starguiders are pretty good eyepieces and compare well with TV plossls so don't expect startling differences. Subtle, maybe. :smiley:

I've owned many TV plossls and quite a few BST Starguiders so have been able to compare them a fair bit. The Starguiders are actually easier to observe with in some ways.

Nothing like finding out for yourself though :smiley:

  • Like 1

Share this post


Link to post
Share on other sites
14 hours ago, John said:

If you go for a Tele Vue 32mm plossl, budget for an eye guard extender as well:

https://www.firstlightoptics.com/tele-vue-eyepieces/tele-vue-twist-on-style-eyeguard-extender.html

Without the extender, you can find the eye relief of the 32mm TV plossl hard to hold. With the extender the eyepiece becomes really comfortable and easy to use.

What's the usable eye relief on the TV 32mm Plossl?  Design ER is 22mm, and there appears to be a bit of recession to the eye lens, so is it closer to 20mm?  My 32mm GSO Plossl has only 15mm of usable eye relief due to eye lens recession, so it's a bit tight with eyeglasses.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By Fo_Cuss
      The scope spec is firming up to be d93/f1000.
      I'll either use flocking material or create a trillion indentations in the surfaces (with peening machine), and use matt barbeque paint.
      A laser calibrator is on the aquisition list.
      Consequently, everything should ultimately be at 'best possible'.
      I will likely need some guidance on the doublet air gap.
      Other than that ... with trembling anticipation...
      May I ask for views on suitable eyepieces?
      I've read a few of the threads on this forum.
      It seems that many eyepieces fall short of expectations.
      Also, Ive noted that people have talked about the effect of long focal lengths on specific designs.
      Either way, I have an initial list, made up from what seems available at reasonable cost.
      I intend to carry out both terrestrial, and extra-terrestrial viewing.
      Perhaps these different fields require different eyepieces?
      ***
      TMB/Burgess Planetary II
      I've read the 'touchy subject' thread.
      I understand the issues, but I'm not in any position to take sides.
      The design seems to offer a 'free lunch', with remarkable 58 deg viewing.
      However, I've read reviews on this forum, talking of ghosting, and scattered light.
      My intention is to blacken the scope internals as much as is possible - perhaps this will be enough?
      Kson Super Abbe
      4 lenses - apparently popular for over a hundred years.
      Celestron 1.25" Omni Plossl
      4 lenses - apparently popular for a longer period than the Abbe.
      In the same Omni range, Celestron offer a 2x Barlow (2 lens).
      ***
      They all purport to be good lenses.
      The Celestron range is cheaper, but hey, they might be just fine.
      Are any of them good for both day and night viewing, or should I be looking for specific day and night eyepieces?
      ... and which eyepieces are better suited to a 93/1000 refractor scope?

       
    • By Lozscott1971
      Hi there people, 
      Firstly can I say what a joy it has been reading and learning from some great posts by your community. 
      My question (as a complete newbie) has probably been asked and answered many times before but some posts are quite old so I hope that you don't mind me re-asking in case there are more upto date answers.
      Ok, I am looking at purchasing the SkyWatcher heritage 130p as I want a portable telescope to take to South Africa with me and after reading the forums it seems like a good option. I will be there for a few months including being next to the Kruger National Park where light pollution will be at an absolute minimum so I am hoping for good results . 
      I have read that a 150mm would obviously be preferable but is there one that is portable  ?? I carry very little luggage so I can accommodate a reasonable size perhaps upto around 10 kilos or so if such a scope exists and would fit into a case that can go into cargo or would this be a no-no ?
      If there are any options please can someone advise. 
      If I do end up with the 130p then I will have a budget of upto £150 to get any additional equipment (ie :- eyepieces) that may be required or would I be better of spending £300(approx) on a different scope with little to no budget for extras ? My intention initially and perhaps ultimately with a travel-scope would be observing the planets only and would obviously like as much planetary detail as feasibly possible but I certainly don't expect Hubble like images !
      I have intentions of purchasing a larger scope at a later date for home use so it really is just about a portable telescope at this stage. 
      Can I say many thanks already in anticipation of some quality feedback from you lovely people !!
      Laurence 
    • By Joaquim Q
      Hi, i..m on Stargazers Lounge for long time ago, but now i have a new scope at last!!! The scope is a Skywatcher classic200p dobsonian, and i received it just one month ago. I.m really happy with it. For now, i.m using the stock eyepieces that come with the scope, a 25mm and 10mm super plossl 52. Yesterday i was received a Celestron Omni barlow, and that expands my magnification range. I posted some pics with my set. 
      Congratulations to Stargazers lounge team, this is one of the best sites to learn about astronomy and equipment. 
      Besf regards to everybody 




    • By Kronos831
      So, i have settled between 2 eyepieces for my scopes.
      The explore scientific 6,5 mm 52degree 
       
      and the Skywatcher UWA Planetary 6mm
       
      I have read that the explore scientific gives better contrast and views.
      The explore scientific will give me 184x and barlowed 369x So should i trade less magnification for more detail?
    • By Kronos831
      Heyaaaa. Its been a long time!(not really its been 5 days :P) its me againn ! As you have seen by the title i am in a delleema (misspells ftw) between eyepieces
      Here are 2 eyepieces i can buy with my budget
      https://www.amazon.co.uk/Prettyia-Eyepiece-Telescope-Skywatcher-Astronomy-Multicolor/dp/B012JC3274/ref=sr_1_9?s=electronics&ie=UTF8&qid=1547060539&sr=1-9&keywords=prettyia+eyepiece (ik its 3 eyepieces but there is no other pack that delivers to my location than only includes one)
      and https://www.firstlightoptics.com/skywatcher-eyepieces/skywatcher-uwa-planetary-eyepieces.html
      But with that excact same money i can buy this! 
      https://www.firstlightoptics.com/skywatcher-eyepieces/sky-watcher-sky-panorama-eyepieces.html
      holy moly 82 degrees!
      Something is telling me to ditch the cheap Zoom eyepiece and the planetarys and  just buy the panorama eyepiece from the money i would use on the planetarys and the 8-24 instead.
      Does anyone have any expirience with that particular price range zoom eyepieces or the planetary or the panoramas?
      Also can you reccomend me a size (7mm 15mm)?(there is no way i m buying the 22mm one) my main targets will be dsos as well as planets so. I will be using those in my Celestron firstscope and in my future ( i ll buy it in like 3 months lol Skywatcher heritage 130p)
      telescopes: Focal lenghts :Current telescope:Celestron firstscope 300mm FL
      Future telescope:Skywatcher heritage 130p 650mm FL 
      To sum up:Get the 2 or the panorama?
      If i get the panorama which lenght?(7mm or 15mm)? (i want a size that compliments planets and most dsos ) ( i live in the southern hemisphere {so no orion nebula for me} (my favourite DSO)   for now atleast) 
      Thanks for your time !
      Kronos!
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.