26mm or 31mm

[Damo636]

Just curious as to how many of you guys would consider swapping the 26mm Nagler for the 31mm if you had my current setup? Having both is not an option.

Edit: I should have added that the 8" is an f6 and the 12" an f5.

[WayBig]

Not sure on the focal length of your dob's, or whether exit pupil is of concern, so I've voted for the 26 in case it is!

[michael.h.f.wilkinson]

I chose the 26 for much the same reasons (assuming the dobs are F/4-F/5) I used Olly's 26mm in his 20" F/4.1 dob and it is a stonkingly good combination. I do not know if the 31mm (7.56 mm exit pupil) would give a somewhat washed out image. If the 8" is an F/6, then the 31 is the perfect match for it, as I know from experience my little APM 80mm F/6. The best option is therefore: both

I am not being helpful, am I

[spaceboy]

Best dropping the details in here Tele Vue Optics: Calculator and see what the figures say.

[Damo636]

Unfortunately that calculater tells me what I already knew, i would get away with owning both

[spaceboy]

As much as I like the 31mm Nag if I were in your shoes I would stick with what you have. The 13 Etho and 31 T5 would leave a huge gap in the middle that may end up costing you a 20 T5 or 22 T4. With your current set up at worst it's going to cost you is a pair of 15x70's.

[Damo636]

You are absolutely right Nick, I have decided to nip this notion in the bud and settle for what I have. I never even considered a pair of bins and they could well provide that wide field fix that I don't get with the dobs. Good advise mate, cheers.

[John]

I'v gone the 31mm / 20mm T5 Nagler approach. The 20mm gets more use from my moderately light polluted back garden but the 31mm is pretty awesome than it does see use

I've sometimes thought about swapping both for a 21mm Ethos or a 26mm Nagler but I've always liked to have "lowest / widest" eyepiece in the toolkit and the N31 did not cost me much (honestly !) so I can't see the point in changing at the moment.

[Adz]

I've gone with a 31 Nagler because apparently its a classic eyepiece and I wanted the biggest field of view possible. I also have young eyes so exit pupil doesn't matter so much for me.

I have a 24 Pan which bridges the gap between 13 eth and 31 nag, when I don't feel like killing the focuser.

[Damo636]

Nice one Adam, i bet the "Terminagler" will knock your socks off the first time you look through it.

[Adz]

Thanks Damo, I hopefully can get it to arrive before SGL7 but communications via email via abas is not exactly quick or easy...!

[michael.h.f.wilkinson]

Thanks Damo, I hopefully can get it to arrive before SGL7 but communications via email via abas is not exactly quick or easy...!

Hope it will arrive in time. Whenever it does arrive, I have no doubt you will love it! It is an absolute cracker of an eyepiece.