I had good luck with the 8x21 Olympus, but a light
film formed and the contrast faded when I left them in the car at 95F outside
(parking lot...probably 125F inside).
I'm guessing it was some condensed outgassing from the grease.
I got another pair....It's excellent, but I don't leave it out.
The 7x18 Carsons were interesting.....very sharp at best but
hard to get both sides perfect. I cycled the focser full-length 30 times
and that cleared up most of the issue....there was a bit of drag.
Was looking at the Carson yesterday. I had taken the rubber cover off the focus and filed a bit off the metal center post to be able to get my eyes nearer to the eyelenses without the focus wheel pressing into my forehead and this helped.
The Visionary doesn't have this problem because although it also has little eye relief the focus wheel is offset enough to let your eyes get close enough to get the full view with the rubber eyecups folded down.
So I looked at the Carson again and this time sanded down the open end of the rubber cover by a mm or two and now the whole thing is really much better and I can also use it now with the eyecups folded as with the visionary. When you can get your eyes right up to the oculars then the edge softness is very much reduced. The resolution and clarity from that little bin is really very impressive. I may yet buy another of different size but it's definitely a design fault that the eye lenses are not offset more from the end of the focus wheel and it looks to be the same with all three sizes that they do in that model. The focus mechanism is very primitive and a bit sloppy but mine really are very sharp.
If they fix that simple thing (or add some eye relief) and make the focus to a higher tolerance then that series will be fantastic. Equally all the Visionary had to do was use decent glass oculars such as whatever the Carson uses.
Now how do I transplant the Carson oculars to the Visionary?.....hmmmm
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