When is the exit pupil too small?

[DJVege]

Hi guys,

More questions! :D

How small is too small for an exit pupil? I've been doing some maths, and if an exit pupil is 1mm....isn't that kind of small? What about 0.5mm???

Thanks.

[merlin8r]

Well, if the eyepiece difficult to use, it's too small. I find a 6mm plossl is very uncomfortable. Any of the long eye relief eyepieces like Televue's or the Vixen LV/LVW range make high-power viewing far more relaxing.

Clear skies,
Shane

[rmcpb]

There are many discussions on this over on CN. Here is one (http://www.cloudynights.com/ubbthreads/showflat.php?Cat=&Board=beginners&Number=1552985&Forum=f76&Words=exit%20pupil&Searchpage=0&Limit=25&Main=1551481&Search=true&where=bodysub&Name=&daterange=1&newerval=1&newertype=y&olderval=&oldertype=&bodyprev=#Post1552985).

Cheers

[DJVege]

Thanks guys. I'll be able to practically test this when my 7mm EP arrives!

Cheers.