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.

Recommended Posts

Thinking of getting a planetary EP to use, and like the look of this EP, http://www.firstlightoptics.com/skywatcher-eyepieces/skywatcher-uwa-planetary-eyepieces.html, which would give me x240 on my Skywatcher Startravel 120 refractor (max x240), so at the maximum level of magnification for this scope, and x260 on my Celestron Astromaster 130 EQM (max x306), which is still well under for this scope. Read a few mixed reviews on them, so any feed back would be grateful, especially if you have used this EP on one of the above scopes too.

Cheers,

Gus

Edited by Knighty2112
spelling

Share this post


Link to post
Share on other sites

Hi Gus,

I think it may be overkill and only suited when skies are perfect.

GB/UK skies tend to be more :clouds2: or  :clouds1: 

Edited by Philip R
  • Like 1

Share this post


Link to post
Share on other sites

Which other eyepieces at the high mag end do you have Gus? I agree that this will probably be too much for your scopes and the seeing for most occasions, so unless you already have x180 through to x220 covered I would look at slightly longer focal lengths

  • Like 1

Share this post


Link to post
Share on other sites
41 minutes ago, Stu said:

Which other eyepieces at the high mag end do you have Gus? I agree that this will probably be too much for your scopes and the seeing for most occasions, so unless you already have x180 through to x220 covered I would look at slightly longer focal lengths

I have a Celestron Omni 6mm EP already, plus a stock 4mm by Skywatcher.

Share this post


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

Hi Gus,

I think it may be overkill and only suited when skies are perfect.

GB/UK skies tend to be more :clouds2: or  :clouds1: 

So is perhaps a 5mm or 4mm better suited pushing the magnification to x120 & x150, rather than trying to coax x240 mag on the ST120?

Share this post


Link to post
Share on other sites

I just bought an ST120 and even under decent clear skies I thought 120x to 150x was about it for the detail I could see on Jupiter (got to see a double shadow transit the other night and that was at 120x). Its more to do with exit pupil than magnification I assume. I also felt that the chromatic abberation this scope shows around the edge of Jupiter interfered more with the view when the planet appeared smaller in the eyepiece. So maybe the 4mm is a good middle ground, but I'd defer to folks who have had longer with this scope. I only have a 5mm and  barlowed an 8mm to get to 150x.

  • Like 1

Share this post


Link to post
Share on other sites
5 minutes ago, Brasspoodle said:

I just bought an ST120 and even under decent clear skies I thought 120x to 150x was about it for the detail I could see on Jupiter (got to see a double shadow transit the other night and that was at 120x). Its more to do with exit pupil than magnification I assume. I also felt that the chromatic abberation this scope shows around the edge of Jupiter interfered more with the view when the planet appeared smaller in the eyepiece. So maybe the 4mm is a good middle ground, but I'd defer to folks who have had longer with this scope. I only have a 5mm and  barlowed an 8mm to get to 150x.

Yeah, just did an Excel chart to lay out all the options for magnification on all my telescope against EP sizes from 2.5mm upto 6mm, and the 4 or 5mm EP comes up better to work with on most of them. In fact if I go with the 5mm EP I could with my 2x Barlow reach the theoretical  maximum magnification on all but one of my scopes, so on the odd night that the seeing is near perfect then I could use that route. Plus the 5mm EP will be a little easier to look through over any smaller ones. :)

  • Like 1

Share this post


Link to post
Share on other sites

These F/5 achromats are just not designed for high power observing. They are great for low to medium power and wide / rich field views - thats their forte.

The theoretical maximum magnification of 240x assumes perfect conditions and perfect optics and we rarely have those luxuries so the practical max is somewhat lower.

I reckon 120x - 150x would be pushing the scopes personally.

 

 

  • Like 1

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 Piero
      As part of my equipment reduction, I'm selling the following items:
      Vixen HR 3.4mm (like new) £200 Vixen HR 2.4mm (like new) £200 1.25" Lunt Herschel Wedge (prism, ND filter, and wedge housing structure like new. Locking screw requires tapping and threading. Hence the discount) £80 SOLD The Vixen HR are the best eyepieces I have ever owned. A few members on CN matched them with the Pentax XO. No light scattering and incredibly sharp. In my opinion colour tone is neutral and sits in between the Docter UWA and my Zeiss Zoom eyepieces. Eye relief is comfortable if spectacles are not used (which should not at high magnification).
      The Lunt Herschel Wedge is an excellent tool for white light solar observing using a refractor. It works even better when combined with a Baader solar continuum filter in my opinion. The hole of the locking screw of the solar wedge requires tapping/threading. Apart from that, everything is in excellent conditions, essentially indistinguishable from new items.
      Caps and boxes (hard case for the wedge) are included, of course.
      Price includes 1st class RM signed-for. Payment via PayPal (as friends) or bank transfer. Collection from Cambridge also available if preferred.
      Thanks for looking,
      Piero
       



       


       
    • By Space_man
      Hey everyone
      I am very new to everything to do with astronomy/looking through a telescope and I have recently bought my first scope (a 8" dob) which came with a 25mm and a 10mm eyepiece but I am looking to upgrade but don't know what is good.
      Any help or advice on what eyepieces I should be looking at buying would be much appreciated (budget is anywhere form 0 to 100 pounds per eyepiece)
    • By Simon Dunsmore
      Hi, 
      I'm looking for a Panaview wide angle eye piece. 32 or 38mm. Willing to pay up to £50 or would consider swapping Canon 1000d.
      Thanks 
      Simon 
    • By Kronos831
      Hi there! I’m looking forward towards purchasing a new wide FOV eyepiece from FLO (first light Optics ) and I do to know which one to pick!
      i will be using it on my f/6 8” Skywatcher dob and hoping to get good views of the Orion’s nebula , (large nebulae in general) andromeda and others.
      I ve heard the panaview 32mm is a good choice but I d like to know about the other options as well. I would like the budget to be around 100€
      Clear skies, Kronos.
    • By redhat
      Hello everyone,
      Bit of a backround: I've been a keen stargazer when in my teenage years, then couldn't pursuit my passion, but recently, in my forties, it hit me again, as I moved  and life is good (South facing large garden, obstructed only from the North by our house, but then I just move the scope further and viola!). Started with 90mm refractor, but was always thinking of reflector.
      Long story short, I've got my SkyWatcher Star Discovery 150P GOTO a week ago. Bought it second hand, very good condition, and good mirror. Have got two nights stargazing, cought cold and I AM LOVING IT.
      Now I would like to get me a nice wide angle ep for DSO spotting.
      The scope is 150mm / 750mm f5. I've done some reading obviously, and Explore Scientific 82 degree series have all good reviews and fit within my budget. I can afford only one, and apparently  the best for DSOs is the one that gives 2mm exit pupil. Now, for my scope that would be 10mm piece, and that is not within ES 82 degree range, so it's down to 11mm (2.2mm exit pupil) or 8.8mm (1.76mm exit pupil).
      My question is: which one would be better for my rediscovered passion? I'm gonna be using that ep for faint mostly.
      Thanks to  everyone in advance for any kind advise.

×
×
  • Create New...

Important Information

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