I agree with what Chuck has to say.
I would add that actual lens performance is usually not the limiting
factor at greater distances. Atmospheric contamination, thermal movement
and subject movement all have an effect and the donut OOF highlights are
a constant bother.
I have a Meade telescope that is also a 1000/11 lens. With the proper
scope to T and T to OM mount adapters, it makes a nice, solid
connection. The finder scope is a real help. Focusing is not bad in
bright light with standard 1-13 screen. I found the 1-7 and 1-8 screens
both helped. I liked the 1-8 better.
Taking pictures of nesting hawks, I found the swaying of the trees in
even tiny breezes was a real problem.
I think you may have a problem with focusing on any of the E-thingies,
alhough the E-3 should be best. Maximum aperture of F11 is really
outside their design criteria.
Moose
Chuck Norcutt wrote:
> I checked the old Modern Photo tests of mirror lenses and there's no Yashica
> of any focal length and the only 1000mm tested was a Meade. But Yashica
> generally made good stuff so I wouldn't be too concerned about purchasing it
> if it's in good condition and you get a good price.
>
> But some other thoughts. There's a reason why you only see Meade listed
> in the 1000mm range. At 1000mm you are basically in telescope
> territory. Given the narrower angle of view of the e-camera it will be
> more like using a 2000mm lens on a 35mm camera. Been there, done that
> with my 2000mm Celestron 8. When you get that long and with that narrow
> a field of view it is extremely important to have
> 1) a massive tripod and sturdy head
> 2) a wider field finder to be able to locate your viewing target.
>
> If you're intent on 1000mm or above I think I'd skip the "lens" designation
> and go straight to a true telescope which is designed to resolve points 1)
> and 2) above. Meade and Celestron are the principal
> and low cost purveyors of same.
>
> Chuck Norcutt
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