The telephotos are not. Only when you get into focal lengths that will 
not cover 6x7 (or whatever), do the lenses get smaller for a smaller 
formats.

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Jostein Øksne wrote:
> Then tell me, guys,
> Why are the medium format optics so much larger for corresponding
> focal lengths and max apertures?
> 
> Jostein
> 
> On 9/2/06, K.Takeshita <[EMAIL PROTECTED]> wrote:
>> Adam Maas mykroft at mykroft.com Sat Sep 2 08:49:28 EST 2006
>>
>>>> 400/4 with SSM would be neat. Can't see any good reason to make it
>>>> DFA, though. DA will make it smaller, cheaper and just as good.
>>>>
>>>>
>>>> Jostein
>>>>
>>> Actually, the size constraints on a 400 are all in the glass diameter
>>> (for a given aperture), format is essentially irrelevant to this, at
>>> least until you start talking LF, so there's zero reason to make it a DA
>>> lens since it will be the same size anyways.
>> Exactly.  After certain size (say 200mm or so), there is no reason to make
>> it a DA.
>> Still some hope for FF wishers :-).
>>
>> Cheers,
>>
>> Ken
>>
>>
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> 

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