theknopsy

1 minute ago, bosun21 said:

You already have a nice selection and range of eyepieces for magnification. I would personally be happy with this unless you definitely want a wider field at 30mm. Take into consideration that the wider 82 degrees 30mm will provide this but not without some aberrations in the additional FOV gained.

Thanks, yes that is my deliberation, perhaps the 24mm would be slightly redundant in my current setup. 

Just now, bosun21 said:

What is the focal length of your scope(s) as with longer focal lengths it becomes somewhat diminishing returns for eyepieces that are too close together in focal length. For example it makes more sense to say have an 18mm , skip the 24mm and go straight to a 30mm. This is applicable for longer focal length scopes. What other focal lengths do you have at or below 24mm?

I have an 8 inch 1200mm dob (f/6). I have a  68° 30mm as my largest focal length and  then 16mm, 12mm, 8mm and 7mm (16mm & 7mm are Nirvana 82° EPs and 12mm & 8mm are BST’s).

6 minutes ago, bosun21 said:

The ES 30mm 82 degrees suffers from aberrations in the outer part of the field. The APM(Stella Lyra) 30mm UFF is a better corrected eyepiece albeit 70 degrees. They are also much cheaper and better value for money IMO. Good luck with whichever you choose.

Hi Bosun, I am currently looking at a used ES 82 23mm which is at a similar price to the 30mm UFF on FLO. Which actually has quite an informative review on it- perhaps a contender! 

12 minutes ago, Zermelo said:

Hello, welcome to SGL.

One advantage of having the same true field of view at a higher magnification (i.e. the ES 24mm in your example) is that it reduces the effect of light pollution in the background sky, helping with the visibility of fainter, extended objects like galaxies.

Were you particularly wanting the 82 degrees? There are the various "ultraflat" clones at 24mm/65° and 30mm/70° - for example the Stellalyra versions, or those by APM and Altair. These are very well corrected, even in fast scopes. The Superviews are cheaper, but do show aberrations towards the edges. I wrote up a quick comparison of the Altair UFF and Superview 30mm here.

The 24mm UFFs are in 1.25" format, hence the limitation on the field compared with the 2" EPs.

Some more discussions:

https://stargazerslounge.com/topic/400497-wide-field-eyepiece-for-fast-scopes-any-suggestions/#comment-4295371

https://stargazerslounge.com/topic/403780-celestron-ultima-edge-30mm-apm-uff-stellalyra-uf/

 

Hi @Zermelo thanks for that-I didn’t know that about reducing the background light so good to keep in mind, especially when not in lower Bortle skies! Thanks also for the links you posted. Really useful reading! Also yes I was ideally looking for an 82° EP in a 2 inch format.

2 minutes ago, Ratlet said:

Why are you wanting to get the 24mm?  You looking for a wider FOV, sharper image?

Hi, yes both really the large FOV and a sharper image as others have said in other discussions. The 30mm does suffer a bit round the edges. 

Hi all, I am deliberating purchasing the ES 82* 24mm eyepiece, however is there much point having this larger AFOV at 24mm as according to the astronomy FOV simulator each eyepiece would give a similar field of view as a result of the different magnifications. So I was wondering if it would be best to wait and get the 30mm ES 82*. Thanks for any advice!

On 20/02/2023 at 08:39, Mr Spock said:

They don't have exactly the same case anymore but the equivalent is this one https://www.cases-and-enclosures.co.uk/hard-cases-protective-storage/flight-cases/roc-cases-small-grey-storage-case-l250-x-w200-x-h125mm-with-cubed-foam-insert

@Mr Spock Took your advice and glad I did, great case! Thanks.

Hi there,

I was hoping someone could give me some insight into whether I can use this filter wheel for visual astronomy? It of course fits into my telescope but I’m struggling to figure out whether it’s possible for it to hold an eyepiece, as is it cannot. 
 

Thanks in advance.

On 26/11/2022 at 11:08, Mr Spock said:

Here's my 'little' collection 😜

What case are you using? 

Hi all, 

Thanks a lot for all the advice, it has been really useful in gauging the strenghts and weaknesses of a range of EPs. I decided to go for the 8mm and 12mm BST coupled with the 2x Barlow that I already have I feel will give a good range of magnifications as @Mr Spock said. 

Thanks again to everyone who replied!

Hi, first time posting. 

I recently got the StellaLyra 8" Dobsonian (which comes with a 9mm Plossl and 30mm 2" EP) for Christmas and looking at upgrading from the stock Plossl.

I'm thinking of the 8mm and the 12mm which would give 150x and 100x respectively. But was then thinking would the 5mm a good choice instead of the 8mm or would it just not see that much use due to unstable atmosphere. Then regarding the 12mm would it be better to go for the 15/18mm to give a bit of a wider view (I have a 2x barlow so have the option to add some more power). 

Thanks for any info.