Chuck Norcutt wrote:
>> Hmm. If this was the determining factor, you'd think that
>> medium-format SLRs should have had really bloody bright
>> viewfinders.
>> AG
>
> No, regardless of the size of the viewfinder and a whopping big mirror
> you can't have a really bloody bright viewfinder with an f/4 lens.
>
> Chuck Norcutt
But comparing:
35mm camera, 100mm/f2 lens, 1/2" square viewfinder to
6x6mm camera, 100mm/f2 lens, 1/2" square viewfinder,
the latter would have a brighter viewfinder, because a 100mm/f2 lens
that covers the image circle of 120 film is letting in more light, so
there's more of it to be concentrated onto the viewfinder (if the
viewfinder's the same size).
Presumably there's some sort of optical reason it's hard to find 120mm
100/2 lenses -- though Hasselblad make a 100/2.2:
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=362306&is=REG&addedTroughType=categoryNavigation
That takes 77mm filters, whereas a 100/2 in 35mm size takes a 55mm
filter. I'm not sure if I understand the optics well enough to know if
that makes sense or not, to be honest..
-- dan
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|