Re: [APML] (OT) IC1396 CCD with Schmidt-like FOV

["Joseph O'Neil" <joneil@multiboard.com>]

>I would bet that the best Nikon lenses do not produce 1/4 wave images on 
>axis at full aperture. Sure, you can stop them down, but then you are 
>making the aperture the size of a binocular lens.

-snip-

Hi Rolland;
         No arguement from me there, I would cover your bet to be sure, I 
was only pointing out that some exceptions occur.  In the case of that one 
lens I was talking about, I believe the news source quoing about it pointed 
out it was basically a one of a kind made for a specific industrial use, 
and by no means  an "off the shelf" lens.
         My problem is (or one of many :)  I am a natural born scrounger, I 
love to stick my nose into things, and it's amazing what shakes loose from 
time to time.   In my limied experience, I run across some weird 
stuff.  Almost everything I am thinking off is from heavy 
commercial/industrial or military application, and some of the stuff is 
rather esoteric.  Some of it is sad too - in the rush to digital, I have 
seen some equipment,  where the oringal cost of the optics alone probally 
cost more than my car,  headed for the dumpster.

         The other thing I have noticed - if I am not wandering off too far 
off topic - is that pound for pound (or inch for inch), telescope optics, 
good optics that is, are a lot less money than optics in any other area of 
industry.    For example, a 6" AP refractor, sold say for industrial use, 
would probally fetch $20G - or more.
         That may jolt some people, but I have a large format camera lens, 
(supposed and APO lens) 6 element, and physically the size of the glass is 
about the same as a 32mm plossl.  Price was $1,000 for the little lens.  LF 
camra lense that approach the physical size of a 31mm Nagler sell for 
around $-$5G, depending on what you are looking at.
         Imagine public reaction if somebody started selling a wide angle, 
1.25", 6 element eyepiece for $1,000 no matter how good it was.  :)

joe




http://www.oneilphoto.on.ca
http://www.multiboard.com/~joneil
"Una salus victus nullam sperare salutem"


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