On 12/16/2016 2:11 PM, Mike Gordon via olympus wrote:
AG on one post:
<Unless stopped down, the 50/1.4 is almost worthless on the 6D.
next post:
<<But when you stop it down, the smearing goes away as it
<<behaves at F5.6 like an F5.6 lens
Ah, yes it goes away on OM5DII quite enough at F2.8, IMO. Rather looks like
veiling flare but can PP out of it stopped down a tad. Rendering is MUCH nicer
than 24-105/4 at 50mm. Autofocus, shmadofocus.
Yawn - - no DSLRs here.
I do love AG's detailed posts on this stuff.
They are interesting, although I don't know what he means by 'better' or 'worse' about half the time. And, as mentioned,
my digital menagerie is all mirrorless, so all the stuff about lenses on his cameras is not relevant here.
I think the direct optical effects of the sensor/sensor stack besides
vignetting/veiling flare were underplayed. Very fast lenses have reduction in
MTF even in the CENTER with wrong sensor stack thickness, others may just
suffer off axis astigmatism.
Admittedly the exit pupil distances of most film slr lenses is long enough to
largely mitigate these effects, though there remains some noticeable badness
for the fast WA lenses in the corners at least. I am unsure about the origin
of the odd color smearing in the corners
People are paying good money for old lenses (and one new one), with swirly,
smeary corners. :-)
but have not seen any reports of this except WA RF lenses.
I follow the KISS principle. All my lenses used for photography where this stuff matters are µ4/3 AF lenses, so designed
for the sensor stacks they encounter. All of the rag tag group that work on the A7 are already, through maker intent, or
mine in acquisition, seriously flawed, so stack thickness is not a problem. ;-)
If the Minolta Varisoft 85/2.8 isn't as good at zero softness setting as it was on film, it doesn't matter. The Holga
and pinholes don't notice. The '70s T-mount 28, 35 & 135 mm f2.8s wouldn't know a sensor stack if it bit them. None of
the LensBabys care.
Vampire Moose
--
What if the Hokey Pokey *IS* what it's all about?
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