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Pentax SMC DA* 60-250mm f4 ED (IF) SDM is a STAR!

Started 4 months ago | User reviews thread
flektogon
flektogon Veteran Member • Posts: 6,226
Re: The Detail is Tremendous

DougOB wrote:

flektogon wrote:

DougOB wrote:

flektogon wrote:

Well, there are many reviews of this lens out there, and with pretty mixed conclusions. Especially in the corner performance. The center performance is usually always good. And for many lenses. It would be interesting to see the same picture taken with different lenses. I noticed that you have few Sigma zooms, just it's not clear for which camera.

If there are negative comments about edge/corner performance I would double check to confirm that they are using it on an APSC camera and not FF. Many people do use this lens on the K-1i/ii especially after removing the baffle.

Doug

Doug, look here for example:

https://www.ephotozine.com/article/pentax-da--60-250mm-f-4-ed--if--sdm-lens-review-25682

And it was reviewed on K-5/IIs

And yet this test shows a completely different result. Tested at 10MP (K10D) but the relative results (centre vs edge) should be consistent.

Not really. The lower pixel density the lesser demand on the lens resolution. The central part, as it is already sharp, won't improve. But the edges yes. Thus the relative results are different, showing "improved" edge resolution.

https://www.opticallimits.com/pentax/479-pentax_60250_4?start=1

Most tests/results that I have seen have been good. I am curious why the ephotozine MTF tests show edge fall off.

Doug

Here is another, not great review (i.e.resolution results):

https://www.pcmag.com/reviews/pentax-smc-da-star-60-250mm-f4-ed-if-sdm

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Regards,
Peter

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