Quote:
Originally Posted by AstroJunk
As for exit pupil - I thought 6mm was more like it for a middle aged bloke? Is there a doctor on the forum??
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It would be interesting to find a simple test by which people could survey their pupil diameters. I always err on the side smaller side, as I doubt most observers have the ambient conditions to achieve a maximum pupil. The eye is pretty poor quality at maximum aperture : contrast and sharpness are well down, so I rarely use those mags despite th efield of view.
Binoscopes make even more sense when you consider that you can have 40% less focal length for an equivelent monocular aperture allowing you to see twice the sky area when comparing true field at the focal plane. Just because you have a large scope doesn't mean you want to give up on the big pretty stuff, and I find a 25" F5 allready getting too restrictive in field for a lot of the showcase objects.