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03-22-2008, 10:44 AM   #1
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SMC Pentax F 35-105mm F4-5.6

I asked about the A version earlier and just noticed they have the F version for half the price. Granted the F doesn't have the constant f/3.5 the A does however, the F does have AF. In terms of IQ, with the F be close to the A?


03-22-2008, 10:52 AM   #2

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I don't own the A or the F but I imagine the optical formula would be the same or nearly so as I don't know how constant vs. variable aperture affects optical formula but the IQ should be virtually the same. (if both lenses are in excellent shape)
03-22-2008, 09:01 PM   #3
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Hi Andrew,
No first hand experience here but just want to point out that the optical formula is quite different between the two lenses. A has 15 elements in 13 groups with a min focus distance of 1.5m and a filter ring of 67mm. Whereas F has 14 elements in 12 groups with a min focus distance of 0.25m and a filter ring of 58mm.

03-23-2008, 12:04 AM   #4
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The F 35-105 is a very good performer. It's also relatively uncommon, so I suggest picking it up

Unfortunately, I only have two small snapshots taken with this lens online. But maybe they'll be of some help to you (taken with the K10D):

03-23-2008, 03:08 PM   #5
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Here's a shot taken with this lens.

K100D Super, 105mm, F5.6, 1/125s, ISO 800.

Processing in Pentax Photo Lab was: Sharpening +1, Contrast +1. I don't have the RAW file anymore, but if I did, I'd reduce the sharpening.

Dan Bridges.

Last edited by dosdan; 03-23-2008 at 03:18 PM.

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