If you're only allowed one eyepiece per session...

[emadmoussa]

I personally find  either a 13mm or 15mm enough to go throughout the session without having to swap eyepieces. I'm talking DSOs..

On my 4" apo, I'm happy with only the Baader zoom.

What about you?

[Qualia]

10mm Delos: 125x; 2mm exit pupil; 0.57º Tfov.

[Luke]

In my 10 inch dob, 14mm Delos (90x) and in my 16 inch, 17.3 Delos (104x). Some nights it's nice to just view for an hour without messing around changing eyepieces

[ronin]

If I can only have one eyepiece then can I swap it between all 5 scopes?

Waiting for the "If you can use no eyepiece and no scopes which would you choose?"

[Bart]

20 mm ES 100* = x90

Barry

[itmo]

my 9mm omegon 100 deg  on a 12" F5. It is surprisingly sharp and wide enough to locate and view  most stuff i watch. 

[John]

The 13mm Ethos serves well in all my scopes for DSO viewing.

[Naemeth]

I often go for a whole session with only the 24mm Panoptic in. So, that counts right?

[estwing]

13 ethos just fits the bill nice......

[Mike73]

17.3MM Delos / x109 / 3.8mm exit pupil

[Mr Flibble]

Well it would have to be my 28mm Nirvana otherwise I'd never find anything!

Unless what I was looking for was something big like andromeda or the plaiedes, etc..........in which case I'd still keep the Nirvana in to view it

[swamp thing]

Often use one eyepiece.

It's normally my 20mm Nagler I do use a 2x Powermate too.

[avtaram]

Baader Zoom.

Avtar

[scarp15]

20mm nagler T5, 

[RikM]

14mm Pentax XW.

This gives me 86x magnification, a 3mm exit pupil and a true field of 0.82°

[YKSE]

The only session I used only one EP was a trip to dark site for about two hours observing, 31mm aspheric was in the focuser to get as many Messiers as possible.

[dkbender]

My last session was all done with a TV 6mm Delos and my 152mm f/8 triplet.

[Mark in Macc]

30 mm ES 82 deg, giving approx 80x. Superb.

[Charic]

8 mm for me ?

My 8mm BST Starguider? (60°AFOV) 150x  (0.4 TFOV )  gets used the most from my light polluted observatory in any one session. The 25mm was better at the darker site for DSO, M31,  but from home observatory, its just a  little smudge due to skyglow, So 8mm for the Moon, Jupiter, Stars, satelites!!

Pondering on a 40mm purchase so that the full exit pupil is available to younger members of family, or a 35mm EP for DSO. Barlow first, but now Im off on a tangent here.

Ans: 8 mm for me ?

[Joves]

Either the 13mm or 17mm Ethos here. Very versatile EP's.

[fondofchips]

32mm Bresser to check finderscope alignment & then Baader Hyperion 13mm.

[SimonfromSussex]

My 21mm Ethos for me, definitely the eyepiece that spends the longest in my focuser when I'm out.

With my 1829 focal length it gives 1.15deg TFOV so most DSOs fit in the FOV but a magnification of x87 so your close enough into the target for some nice detail.

I owe Estwing a big thank you for introducing me to the Ethos wonders, although my wallet might think otherwise!

[Pig]

17.3mm Delos here

[crashtestdummy]

20mm explore scientific 100° for me,it's what I use for about 95% of my viewing

[emadmoussa]

20mm explore scientific 100° for me,it's what I use for about 95% of my viewing

I'm thinking about buying the 14mm version for my 10" Dob. Just out of curiosity, how's the coma since you're using it in a Dob as well?