On 4/22/2015 1:19 AM, Hughes wrote:
I have always avoided reflex lenses, because of the well known bad bokeh and
lower contrast issues.
Here you can compare it to other mirror lenses.
<http://web.archive.org/web/20110720030720/http://brashear.phys.appstate.edu/lhawkins/photo/mp-cat-tests.txt>
Contrast isn't much of a problem with digital. Here's Ian's windmill image with simple PS adjustments.
<http://www.moosemystic.net/Gallery/Others/Swiss/Llandudno_Windmills.htm>
And an image of mine, taken with the Sigma 600/8, which you'll see in the tests linked above is lower contrast, although
slightly higher resolution, than the Oly - shooting through 8 miles of air doesn't improve contrast, either.
<http://galleries.moosemystic.net/MooseFoto/index.php?gallery=California/Yosemite/Yosemite_2011/Yosemite_Valley&image=_MG_0382oof80m.jpg>
As you can see from the above samples, bokeh isn't a problem at long distances with nonexistent or minimally detailed
backgrounds.
Here, in some relatively ancient shots with 600/8 on Canon 300D, you can see again how nicely it works with distant
subjects and the ring bokeh in the shots of marmot and squirrels; not necessarily a deal breaker.
<http://www.moosemystic.net/Gallery/MPhotos/Maine/Sigma600/>
Try to use one to get even closer to something close, with foreground and background stuff, and thing scan get surreal,
with doubling of lines, etc. Sometimes artistic. ;-)
However, they have huge advantages in size and weight over conventional lenses
and don't suffer from out of focus color fringing. I was traveling last year
and was thinking that maybe a reflex lens, makes sense for travel.
With a high ISO setting on my A7R they might even be handholdable as they are
not long,heavy and unwieldly.
I'm not convinced. I did try the considerably smaller, lighter Tamron 350/5.6 handheld. My hit rate with 500 mm would be
quite low. An A7 II, with IBIS, could be a different story.
Looking at the nature of the beasts and the Modern tests, I suspect my experience with the Sigma 600/8 will be close to
what you would find with the Oly 500/8.
Info by Analogy Moose
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