That's right, I tested some 645 lenses on the *istD.
The FA645-35/3.5 and the A645-45/2.8, to be exact.
I have played around with my other 645 lenses as well, but not in a
very systematic way. I'd really like to repeat the test with all the
645 lenses I have, and compare them to the K-mount lenses I have
available in the same AOV.
It may be a while before I get around to that, though. :-(
Meanwhile, let me share with you a slightly different finding. I have
been experimenting with different optical solutions for shooting snow
crystals at around 4x life size. I've tried 4-5 different setups with
K-mount lenses.
Currently, I use a 645-A*300/4 with a reversed 645-FA75/2.8, a #2
extenstion tube, and K-mount adapter. This solution gives a very good
optical quality. However it would probably be awkward on a 645-based
camera because of vignetting.
Jostein
----- Original Message -----
From: "Sylwester Pietrzyk" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Friday, February 10, 2006 10:39 PM
Subject: Re: Lenses for 645D?
On 2006-02-10, at 20:27, jtainter wrote:
By reputation, the very best 35 mm. lenses are said to be sharper
than corresponding medium format lenses because they have to be
(i.e., to get good image quality in the smaller negative). For the
reason given in the first paragraph, I don't know this personally.
It is just something I have read.
But if MF lenses are less sharp than 35 mm. lenses, I wonder if
existing MF lenses will be good enough for a digital sensor? As we
know, some lenses that do well (or okay) in 35 mm. do not perform
so well on APS-C. Will 645D buyers need new lenses?
Jostein made some tests. FA645 35/3.5 is about as sharp as 31/1.8
Ltd. Most of lenses for 645 is of very high optical quality, just a
few are weak - for instance FA 45/2.8, which is actually worse than
FA 45-85/4.5 zoom... So I think majority of P645 lenses will work
very good on big sensor.
--
Best regards
Sylwek
