Practical experience shows that the best old FF lenses are quite decent
performers on APS-C sensors, sometimes comparable to good 'digital'
lenses
(at least up to 12-16 megapixels), except for a typical higher CA and
purple
fringing. That's because you get rid of the weaker part of their image
field. Oh, and that only applies to focale lengths around 35mm or longer
(most if not all older wide-angle lenses are much overperformed by
current
APS-C digital sensors).
On the other hand, I still have to find a single 'analog' lens which is
comparable to newer lens designs on FF sensors with a pixel count of
24 or
36 MP.
Heck, even most FF digital designs cannot cope with the D800 sensor!
Sure
you can use whatever lens you like on a modern FF DSLR (provided you
can fit
and focus it), but don't expect to exploit their potential.
Dario
-----Messaggio originale----- From: J.C. O'Connell
Sent: Wednesday, October 16, 2013 6:57 PM
To: Pentax-Discuss Mail List
Subject: Re: K3 problem using flash and AA
My Reply : I disagree with regards to full frame. As long as the corner
performance of the FF lenses
matches 2/3 of the performance of the APSC lenses the overall system
performance of FF will
be equal to or greater than the Aps performance. Generally speaking,
you dont need as high a
performance FF lenses for better overall system performance than apsc.
Its a larger format, it has
more overall lines of resolution even if the absolute line pairs/mm is
lower.
Regard no AA filter, aliasing occurs when the incoming spatial
frequencies are too fast
for the sampling. With a high resolution sensor and cheaper lower
resolution lenses,
NO aliasing will likely occur. Aliasing is more likely to occur with
super high spec ultra
high resolution * or APO lenses, not average or poor ones.
On 10/16/2013 9:38 AM, Dario Bonazza wrote:
Darren Addy wrote:
Cameras with no AA filter are going to separate the "men from the
boys" as far as lenses are concerned. It is going to make APO and Star
lenses almost mandatory. Either that or you are going to have to
"enjoy" a lot more time in post-processing. This problem is
exacerbated by a full frame sensor which uses the corners of the image
circle that are getting cropped out by an APS-C camera. In short,
those who want a full frame DSLR are either going to have to use their
best lenses with it, or procure some.
My reply:
I keep telling that to all those funky boys begging Pentax for a full
frame camera and counting on good lenses of the past they already
own and
treasure. Once FF will be available, you'll have to buy a whole new
lens
outfit based on new-generation lenses (provided they will be made
available) or be satisfied with so-so performance.
That's well known by Canon and Nikon shooters, and mostly neglected
among
dreaming Pentaxians. In brief, putting together a Pentax FF outfit
won't
cost you less than switching to Canon or Nikon, the advantage being you
won't have to do that all at once.
Dario
--
J.C. O'Connell
[email protected]
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