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Old Jan 17, 2007, 11:40 PM   #31
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robar wrote:
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Russ,

CA is a piece of cake to get rid of in an image program that allows 'hue/saturation' adjustments. 30-45 sec is all it takes..

roy
That's good to hear. I haven't really messed around with CA corrections since my other lenses don't seem to have the same problem. I was disappointed that this one has it since it's a fairly nice, though old, Pentax SMC prime lens.

Here's an example with what I consider bad CA:



But then, I also got this shot at the same time which didn't have it:



I think it's an exposure problem and user error, since I'm not experienced enough with manual exposure to be sure I'm doing it correctly.

I'll run these back through PPL3 or PSE5 and see how the CA cleans up. Thanks for the suggestion.

Russ
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Old Jan 18, 2007, 6:05 PM   #32
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Russ

Your 2nd pict has shown what the lens is worth.

Even the first is not not bad at all as I believe you had that handheld

Daniel
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Old Jan 18, 2007, 8:26 PM   #33
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I managed to buy my Sigma 100-300mm lens for $(US) 87.00 on E-Bay. It has been a good to very good, but not really great lens. It is fairly short and you can find it fairly easily.

MT/Sarah
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Old Jan 20, 2007, 12:06 PM   #34
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rfortson wrote:
Quote:
robar wrote:
Quote:
Russ,

CA is a piece of cake to get rid of in an image program that allows 'hue/saturation' adjustments. 30-45 sec is all it takes..

roy
That's good to hear. I haven't really messed around with CA corrections since my other lenses don't seem to have the same problem. I was disappointed that this one has it since it's a fairly nice, though old, Pentax SMC prime lens.

Here's an example with what I consider bad CA:



But then, I also got this shot at the same time which didn't have it:



I think it's an exposure problem and user error, since I'm not experienced enough with manual exposure to be sure I'm doing it correctly.

I'll run these back through PPL3 or PSE5 and see how the CA cleans up. Thanks for the suggestion.

Russ
it may very well be the angle of the light hitting the subject. is this any better?
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Old Jan 20, 2007, 5:37 PM   #35
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Yes, Robar, I can see the difference. I think I also overexposed a bit, which is compounding the problem. If we were talking about computers, I'd say PEBKAC (problem exists between keyboard and computer). :lol:

Time for me to quit buying lenses and start learning how to use them.

Russ
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Old Feb 3, 2007, 6:55 PM   #36
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Interesting I bought this off ebay for $100, not much of a deal I think as retail seems to be about $100. I haven't used it yet as I haven't purchased a camera yet!

I was wondering if I should keep it or flip it. I guess I can't expect miracles from $150 value lens, on the other hand seeing your pictures I can see having fun with it.

Cheers
Guy


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Old Feb 4, 2007, 5:19 AM   #37
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Even the non APO version (specific light conditions that is of real benefit)
even the $120 (vs $200+ APO) Sigma 70-300 is an outstanding bargain.

Having had a couple of them both Canon and Pentax (abandoning Canon) versions.

PS the Pentax K10D or the Pentax version performs amazingly better.... almost NEVER even in lowest light full zoom ever gets AF lost.
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