Interesting results. I am surprised by the 50mm f2.8 macro - I never had
that lens but figued ti would be really sharp.0. Is the Sigma you tested
the f2.8 lens or another?
I once did a detailed test of 50mm primes including my A 50 f1.4, M50
f1.7 and Rikenon XR 55 f1.2. The results were that I eventually sold the
Rikenon (I held out till I needed the money though) and opted for an FA
50 f 1.7 for auto focus.
Mark
On 4/12/2013 9:26 AM, Collin Brendemuehl wrote:
http://www.flickr.com/photos/55001392@N08/8643040116/in/set-7215763322447340
7/
Distance it iPhone is about 8 feet.
Not the detail of the side switch on top and the bottom connector.
#1 Sigma 70-300 DG APO zoom at 70mm. With that much extra length I would
expect it to have more information. Still, it is also at one end of the
range so images are often softer. Yes, this is dead-center in the image.
But it's all there.
#2 Pentax DA 18-55 WR at 55mm. Not as sharp as the Sigma, but not too bad.
#3 Pentax-F 50/1.7. The best of the batch. Almost wish I'd not promised it
to someone. But that's ok.
#4 Pentax FA 50/1.4. The worst of the batch. I tried several shots to see
if the results would be consistent. They were. I'm disappointed. It's not
bad; it's just not as good as I'd hoped.
#5 Pentax-A 50/2.8 Macro. Again, several shots to check to see if I'd
done something wrong. As before, not as good as hoped for, though certainly
acceptable.
Ok -- resolution is not everything. Having done a bunch of LF I have a
greater appreciation for image rendering than for resolving power. But
since rendering options are not available concerns on miniature cameras,
resolution is the only question available.
I was pleasantly surprised by the Sigma. It's a good zoom, though certainly
not a great one. Next I'll take it outside and check the corners at various
lengths.
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