I also agree that new lenses are better, even on APS-C. I use almost
exclusively new lenses on my K-5IIs (DA 12-24 + DA 17-70 + DA* 50-135, all
together exceeding 95% of my shots ), with the FA 31 and FA 77 Limiteds as
the few noticeable exceptions to my all-digital approach.
However, I have the feeling that many FF lenses are more troubled when
dealing with modern digital FF cameras than they are on APS-C models.
But the very point is "once you buy a FF DSLR now, you have to buy new
lenses too".
Dario
-----Messaggio originale-----
From: Paul Stenquist
Sent: Wednesday, October 16, 2013 8:53 PM
To: Pentax-Discuss Mail List
Subject: Re: Old/new lenses on FF (was K3 problem using flash and AA)
My first digital experience was with Pentax full frame lenses on an *istD.
It was not pleasing. CA and fringing were frequently a problem. I never
owned some of the best full frame lenses, but I came away from my early
digital efforts convinced that new lenses designed for APS-C digital were
the way to go. I now use DA* lenses almost exclusively on my K-5, and I'm
extremely pleased with the performance. Looking forward to trying them on
the K-3. I expect they'll make a great team.
Paul
On Oct 16, 2013, at 1:21 PM, Dario Bonazza <[email protected]>
wrote:
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
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J.C. O'Connell
[email protected]
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