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shanmac

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Posts posted by shanmac


  1. 46 minutes ago, cloudsweeper said:

    Great news!  I recently acquired a Meade 5000 UWA 24/82 for my Bresser - it gives a decent field of view, without excessive exit pupil.  I'm sure you'll enjoy your new toy.  Going back a bit, you mentioned a 30mm EP.  That would be a good idea for finding your way round.  A Revelation 30 would not give much more than your new 24mm, but since you're into the ES 82 series, the ES 30/82 would give a handy 2 deg.  A lower cost/weight alternative is the Baader Aspheric 36/72.

    Have fun!

    Doug.

    I actually opted to invest (in the near future) in decent Binos instead of the 30mm. After using an app for AFOV vs DSO's, I decided I would probably get better use from the 24mm. If the 24mm is not low powered enough for finding my way around I'll have too look at maybe the ES30. I'm gonna wait for clear sky before my next move, which may also include the 14mm Morpheus ? 


  2. Well, I got to try my 13mm Hyperion out tonight. Moon was the focus as it was full and drowned almost everything else out. The Hyperion performed poorly in my Dob. Brightness was poor, and there was an obvious glow around the outer 20%. It would seem that all the advice given to avoid these in a fast scope is very good advice indeed. 

    I compared every eyepiece I had, even the stock EP’s that came with my mak performed better than the Hyperion @ f/5.

    My personal experience with the Hyperion in an f/5 Dob was not a good experience at all.


  3. 3 hours ago, NGC 1502 said:

     

    I fully respect the above advice. However, my local club has a 16” F4.3 Dob, and the member who looks after that scope usually brings along the Hyperion 17mm to use with it.  I have to say that I’ve been positively impressed with how well the 17mm performs in that scope, especially towards the edge of field of view.

    Perhaps the 17mm is the best of the Hyperions ?

    Ed.

    There are many opinions on these Hyperions, from what I am gathering the majority 70/30 are negative in reguards to the use in a fast scope. I have no complaints when using the 13 in my f/11 mak, f/5 could be different.

     

    I will reserve my judgment untilI I get a chance to try my 13mm out for the first time in my f/5. All that’s needed now are clear sky’s..


  4. 19 minutes ago, rwilkey said:

    Hi Shanmac, I used Hyperions in my f/5 scope and found them soft at the edges, there are lots of other good ep's out there that will work very well.  My advice is not to risk it. 

    Yes I definitely wouldn’t take the chance on them after reading reviews and from the advice given. The fact that I already have the 13 + fine tuning ring for which I use with my mak , is why I was considering using them in my f/5. I haven’t had the chance to try the 13 out yet but it’s looking very likely it will be in the f/5 only once ☹️. Thanks for the advice rwilkey

    • Like 1

  5. 50 minutes ago, bomberbaz said:

    Hyperions are best suited to scopes of F8 and above imho. I used them in an F10 celestron nexstar and was very happy with the views it gave.  When I got myself a F4.7 dob the views were drastically poorer and so ended up selling all my hyperions.

    Yea, it would seem f/4.7 would be too fast to get on with the Hyperions. To think that I could possibly get quality performance from the Hyperions in my f/5 scope is likely wishful thinking.


  6. 41 minutes ago, bomberbaz said:

    +1 for the ES range of eyepieces.  FWIW I have 3 of the BST eyepiece and find them very easy to get on with in my mac, so although they lack the fov of the es eyepieces, they are very cheap and offer great value for money.

     

    Yea, I do though want to get the best out of my 10" Dob, i'm not sure if i could accomplish that with the BST. But i am no expert so I may be wrong.


  7. 57 minutes ago, cloudsweeper said:

    Excellent choice of telescope!  For finding your way round, an ES 82 30mm would be great, giving about 2 degrees of field.  Larger focal lengths would give a poorer view in terms of contrast/background brightness.  And Yes, coma will be noticeable at the edges, but it doesn't diminish the experience or detract from the enjoyment of nebulae and galaxies.  And with large clusters for example, you only focus on the central region anyway.  I personally prefer the less-than-sharp edge clarity to putting in more glass and weight.  (Not to mention more expense.)

    Doug.

    Cool, cheers Doug.

    • Like 1

  8. 1 hour ago, Stargazer McCabe said:

    Two things:

    1) These may save you a few shillings. I believe they are the same, or very nearly the same as the ES82* range. If anything differs it might be something like coatings perhaps. But do have a look. http://www.opticstar.com/Run/Astronomy/Astro-Accessories-Telescopes-Opticstar.asp?p=0_10_5_1_8_322

    2) You'll be on the cusp of where Coma might start to be noticeable to you (depending on how critical you are). I have a 4.7 Dob and a ES82* 30mm. Some nights I don't use the Coma Corrector and some I do. On the nights I do I can reduce the coma towards the edge of the FoV. On the nights I don't the views are still mighty fine with a little more coma visible, but it certainly doesn't spoil my enjoyment. @Littleguy80 raised the same question a while back and I'd tell you what I told him; buy the eyepiece, enjoy it, if the coma is an obvious intrusion, get a coma corrector. If it doesn't bother you, happy days... :thumbsup:

    Thanks for that. I will take a look at those Opticstars for sure, though I would be a bit cautious on having faith in a clone but yea, worth a look.


  9. 1 hour ago, Nyctimene said:

    Slow down, please. You are already owner of a decent 32 mmf Plössl, and I'd try out first, if it works well with your 10" scope at your given location.The magnification with the 32 mmf will be almost the same- it's just the field of view that will be more extended with the 30 mmf/2". If you are suffering from light pollution, the brightness of the sky background might reduce the contrast of certain DSO's markedly (esp. galaxies, gaseous nebulae). In this case, your eyepieces from 20 down to 10 mmf would be more suitable; just try out.

    Your f/5 scope will, as any fast Newtonian, suffer from coma (a comet-like distortion at the field's edges; have a look at this: http://umich.edu/~lowbrows/reflections/2007/dscobel.27.html). A coma corrector can diminish this inherent optical fault; but the degree of "coma-tolerance" seems to vary considerably from observer to observer. I for myself have no problems with coma notion when observing with my f/4 to f/5 scopes; others claim, that anything faster than f/5 needs a coma corrector for them at any rate.

    Hth.

    Stephan

     

    Yea, Im getting great results with the Revelation Astro 32mm on my 5" MAK. Its the ES's 82° FOV for the 10" Dob that prevents me from slowing down ?

    • Like 2

  10. 52 minutes ago, rwilkey said:

    Hi Shanmac, your plan to invest in the 30mm ES82 would be great for DSO's which thrive at low power, the only thing is that it does not have the eye-relief specified on the ExSc website, it is slightly shorter so you have to get the eye a bit closer to see the whole view.  Your idea to get 3 eyepieces in total is the best way to go, I think.  I suggest something like the 18mm, 12mm or 8mm StarGuiders.  Good luck with your choices!

    The ES82 30mm has 22mm eye relief, so it’s in the lead at the mo ?


  11. 35 minutes ago, rwilkey said:

    Hi Shanmac, the BST StarGuiders are pretty good all-rounders and excellent value for money, good sized eye lens and good eye-relief with twist-up eyeguard found here:

    https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=Bst+starguider&_sacat=0

    For a wide field 2" ep I would go for the 28mm Explore Scientific 68° Series Eyepiece found here:

    https://www.firstlightoptics.com/explore-scientific-eyepieces/explore-scientific-68-degree-series-eyepieces.html

    If you can afford it the ES82 series 30mm is even better with its wider AFoV, but not good if you wear specticles.  

    BTW, the 13mm Baader Hyperion does not work so well in a fast scope like yours

     

    Thanks man. Yea the ES82 30mm seems great value alright. I’m wondering if I was to buy one EP for viewing DSO’s would a low power 30mm be the first one to invest in, and also would 3 in total, low, mid and high power be the way to go? 


  12. Hey Guys, I’ve recently purchased a 10” Bresser Messier Dobsonian f/5, I need some advice on eyepieces. It would seem these type of scopes are quite picky in reguards to eyepieces. It is mostly going to be used for observing DSO’s. The Scope can accommodate both 1.25” and 2” eyepieces. I am a total newbie to the world of Dob’s and 2” eyepieces so all help will be appreciated. Budget is not set in concrete but value for money is a must.

    I also have a 5” Mak for which I use - Revelation Astro 32mm plossl - Baader Hyperion 13mm - VixenNPL 10mm and 20mm.

     


  13. Thanks for that guys. I think I have now removed the 8" from the equation. I have plenty of room for storage, and have no worries about it being too heavy as I wouldnt have to move it too far from where it will be stored. Budget is a bit of a concern but not strict. I think my main concern is the price difference between the 10" and the 12".

    Is the 12" worth the extra £300+ ?


  14. Hi everyone..

    I need some advice on cleaning my lenses and primary mirror...

    I only have my telescope 2 weeks so I am sure they do not need any attention yet, but the thought has crossed my mind.....

    As the telescope is a very sensitive peace of kit ,I am very cautious on the do,s and don,t on this subject..:icon_eek:


  15. Try Saturn and the moon again!

    Your new scope will blow the socks off the Tasco on both these objects.

    As soon as you can get yourself a good 32mm EP for low power and a good 8 or 9mm for high power.

    The moon with a decent 8mm EP is just incredible. Feels like you're floating about a hundred miles over the surface.

    I have a good 6mm EP but the atmospheric conditions are seldom good enough to use it so I wouldn't recommend buying one till you have at least the other two in your collection.

    Can I use any type of EP with the skymax 127??

    Could you recomend a good quality 32mm EP..??

    Or should I buy a set?

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