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03-19-2010, 04:48 PM   #1
Pentaxian




Join Date: Feb 2009
Location: Alameda, CA
Posts: 3,194
Test Photos: DA* 60-250mm, Pentax-F 1.7X AFA, and Tamron-F 1/4X Pz-AF MC4

I happened to have my DA* 60-250mm, Pentax-F 1.7X AFA, and Tamron-F 1/4X Pz-AF MC4 here with me. So I took a few quick test shots.

I don't have time for a detailed analysis right now. Here are JPEG files directly from the K10-D body.

DA* 60-250mm at 250mm, no TC:

- Lens at F/4.0
- Lens at F/5.6

DA* 60-250mm at 250mm, with Pentax-F 1.7X AFA. The AFA corrects the f-stop setting (e.g. camera sees F/10 when lens is set at F/5.6) but focal length has to be entered manually for SR purpose:

- Lens at F/4.0
- Lens at F/5.6

DA* 60-250mm at 250mm, with Tamron-F 1/4X Pz-AF MC4. The TC feeds the lens data through. The camera sees unmodified f-stop and focal length settings of the lens:

- Lens at F/4.0
- Lens at F/5.6

03-19-2010, 05:03 PM   #2
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cupic's Avatar

Join Date: Apr 2008
Location: Australia-NSW
Photos: Gallery
Posts: 4,726
Interesting as I have recently bought the Pentax TC and was surprised that the FL displayed f/2.8 even though I was using the sigma 100-300mm f/4.So basically its MF with the Tc on,this I will try,just to point off was there extra noise coming from the lens ,I deducted that the noise was coming from the screw drive of lens.the Pentax TC performed great TFS


cheers
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250mm, 60-250mm, afa, da*, f/4.0, f/5.6, k-mount, lens, mc4, pentax lens, pentax-f, pz-af, slr lens
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