Forum: Monthly Photo Contests
11-08-2020, 04:28 PM
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detail! focus and symmetry
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Forum: Post Your Photos!
07-02-2013, 12:02 PM
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My pet cockatiel Snoopy... not camera shy.
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Forum: Monthly Photo Contests
11-28-2006, 09:19 AM
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Portrait of pet cockatiel
Jack
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Forum: Pentax SLR Lens Discussion
10-22-2006, 12:24 PM
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The reason the front element doesn't move while focusing is because it is an internal focus lens (IF), that is, the elements move within the barrel rather then moving the external front element. Many lenses have this feature and it is handy when using a Polarizer that must be turned to acheive maximum results. That's why one can use a "Petal" type hood... if you notice the bottom petal of the Pentax kit lens comes off to allow easier rotation of a polarizing filter.:rolleyes:
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Forum: Pentax SLR Lens Discussion
10-05-2006, 06:57 PM
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Thanks Jeff for the reply... I bought the Tamron 28-300 AF LD XR DI from KEH but they sent me a regular XR instead of the DI, for the price of a "BGN" Di... so I returned it for an exchange and KEH said there wasn't a DI available for the price I paid. So I purchased a new Sigma 28-300 AF 3.5/6.3 DG SLD Macro with IF instead, from Sigma4Less. Just curious if anyone had used one.
Jack
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Forum: Pentax SLR Lens Discussion
10-05-2006, 12:56 PM
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Has anyone had any experience with this lens, Sigma F3.5-6.3 DG SLD Macro with internal AF on a *IstDL It's not a true macro with 1:1 or 1:2, but it will close focus. I have not had a chance to use it often enough outside make a determination of it capabilities although, it does pretty well with flash and low light. :D but not as good as my old Asahi M-50mm 1:2 f2.0... sure like that old lens.
Jack
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Forum: Pentax DSLR Discussion
10-05-2006, 09:47 AM
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How far away is the object that you are trying to bring into focus and does it have sufficient contrast?
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Forum: Pentax DSLR Discussion
10-03-2006, 04:59 PM
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Leaton
I too made a "cable" release from RS parts. You have to utilize 2 buttons... 1 for shutter and 1 for autofocus. Auto forcus works just fine.
Jack
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Forum: Pentax SLR Lens Discussion
09-28-2006, 10:56 AM
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Hello All! This is my first post here been lurking in the wings reading all the good comments and info. I thought I would throw in my 2 cents. An important point to remember, make sure the lens on which you are installing a petal type hood is an internal focus (IF) lens, or that the front element does not rotate while focusing. Otherwise, the hood will never be correctly oriented in relation to the vertical or horizontal.:D
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