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02-10-2010, 11:38 AM   #16
Igilligan
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I agree... completely

Even at the wide end this a very nice lens....



02-10-2010, 11:43 AM   #17
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QuoteOriginally posted by Igilligan Quote
Even at the wide end this a very nice lens....
Try it on a human being. At 55mm and ~f/8, it's actually an alright portrait lens.
02-11-2010, 11:15 AM   #18
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I used to use my Tammy 70-300 until I found that it was not very good once I got to my typical outdoors bird and nature shots. I went to the 55-300, and I found it night and day. The 55-300 seems to have the 300 in mind, and I get fantastic shots with it at that range. I also find it does well at the wide end.

I've gotten so acustomed to the camera that I had forgotten about the Tammy, but recently remembered that its strength really is for the closer shots. At a short range it does out perform my Pentax 55-300 at the long end, but the differences aren't that big.
02-11-2010, 11:58 AM   #19
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I find Photozones test of the lens to be a bit strange. I've seen amazing pics around 300mm from this lens. And yet Photozone rates Nikons 70-300 much higher on the MTF.

They must have gotten a bad sample of the Pentax lens?

02-11-2010, 05:12 PM   #20
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QuoteOriginally posted by the swede Quote
I find Photozones test of the lens to be a bit strange. I've seen amazing pics around 300mm from this lens. And yet Photozone rates Nikons 70-300 much higher on the MTF.

They must have gotten a bad sample of the Pentax lens?
I am not that happy with the results from mine between 200 and 300mm - you have to stop down to f11 to clean it up fully at 300mm, which makes it a very slow lens for practical purposes. It went back to Pentax twice who declared it 'within spec'. So clearly some variation is permitted with the manufacturers' tolerances.

With several lenses I have found my experience differs from test results - sometimes better, sometimes worse.
02-12-2010, 12:54 PM   #21
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Wow. Thanks for the pix. I've decided to order another 55-300 and test it accordingly - indoors and out this time. I'll also do a ff/bf test (any links to a primer on conducting such a test would be appreciated - I'll be searching for a one over the next few days) I've read and re-read almost every review of this lens on the web so I may have had a less than stellar copy. I guess my next lens would be a fast 300mm prime but considering the prices I'll be using the 55-300 for some time. Thanks for all the great insight.


Mick
02-12-2010, 01:00 PM   #22
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QuoteOriginally posted by newarts Quote
Photozone.de test results show that at 300mm, wide open, the DA-55-300 on a Pentax is significantly sharper than the Sigma 70-300 on a crop Canon both center and edges.
No, no, no and no. Please read the signs on photozone.
02-12-2010, 01:02 PM   #23
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QuoteOriginally posted by the swede Quote
I find Photozones test of the lens to be a bit strange. I've seen amazing pics around 300mm from this lens. And yet Photozone rates Nikons 70-300 much higher on the MTF.
Does no one read the bloody big warning on Photozone not to compare results across different mounts. Short of a Chuck Norris chin punch whenever you view the site, i am not sure what else klaus is supposed to do to make people aware.

02-12-2010, 11:15 PM   #24
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Makes one wonder. On a Pentax, could the Sigma be sharper than the 55-300mm? "The world may never know."
02-13-2010, 05:05 AM   #25
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What happened to people testing their lenses in a real world shooting scenario? If it is sharp, produces excellent colors and contrast, the rest is up to your skills and how you apply them.

Jason
02-14-2010, 01:33 AM   #26
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Here are some links on front / back focusing test procedures and charts......
I have never done the test, but am interested in seeing the results....
02-14-2010, 07:20 AM   #27
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QuoteOriginally posted by Alfisti Quote
Does no one read the bloody big warning on Photozone not to compare results across different mounts. Short of a Chuck Norris chin punch whenever you view the site, i am not sure what else klaus is supposed to do to make people aware.
Of course I read the cross-mount warning and understand it.

That's why I specifically said "Photozone.de test results show that at 300mm, wide open, the DA-55-300 on a Pentax is significantly sharper than the Sigma 70-300 on a crop Canon both center and edges."

You are right, the 6% difference in wide open center sharpness measured between the Sigma on Canon and Pentax on Pentax sensors may not be significant, but I'll bet the relative edge sharpness is significant:

Center/Edge:
Pentax on Pentax 1769/1557
Sigma on Canon 1676/955

Dave

Last edited by newarts; 02-14-2010 at 10:51 AM.
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