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[OM] Re: WTB a lens to replace the other

Subject: [OM] Re: WTB a lens to replace the other
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 02 Mar 2007 22:43:30 -0500
Thanks, CH.  I note that the primary mirror diameter for a 350/5.6 is 
62.5mm.  I also note that the primary diameter for a 500/8 is also 
62.5mm.  Same mirror blank, different curve ground in.

My guess is that it would be very difficult to make a 350/8.

Chuck Norcutt

C.H.Ling wrote:
> Tamron has a 350/5.6 and there is also a Russia 350/4.5 which seems pretty 
> good in resolution, I have tried it once on my E-1.
> 
> C.H.Ling
> 
> ----- Original Message ----- 
> From: "Chuck Norcutt" <chucknorcutt@xxxxxxxxxxxxxxxx>
> 
>> Mirror lenses of less than 500mm focal length are quite rare as are
>> apertures larger than f/8.  I think someone made a 350mm mirror lens
>> long ago but I can't remember who it was.
>>
> 
> 
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