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11-08-2007, 04:13 PM   #16
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QuoteOriginally posted by offertonhatter Quote
I have just bought the Sigma 70-300 DG (non APO) and I have not had any purple fringing with it.

It has replaced my old Sigma 100-300 DL lens which was too slow

It is a great lens and worth considering.
Thanks. I'm learning toward the Sigma (over the Tamron). I like Sigma equipment, having owned some in the past. I know things change as the DECADES go by() but one tends to stick with what one knows, right?

11-08-2007, 08:45 PM   #17
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I've found increasing the contrast +2 or more likely +3 makes a world of difference with the Sigma. Otherwise, the images are pretty flat and lifeless. Have not noticed a PF issue.
11-09-2007, 04:04 AM   #18
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Today I borrowed a Tamron 70-300 lens from a colleage to try out at home, so that I can gauge the difference in reach between a 300mm lens and my DA50-200mm lens.

Surprisingly, I find that at maximum zoom, a 200mm lens can achieve the same reach (somewhat) as a 300mm lens by just walking 2 steps forward. Is my observation correct?
11-09-2007, 06:08 AM   #19
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"..I've found increasing the contrast +2 or more likely +3 makes a world of difference with the Sigma. Otherwise, the images are pretty flat and lifeless. Have not noticed a PF issue..."

I'll keep that in mind, thanks. I think to an extent the amount of pleasing contrast is subjective. I've noticed that some people like more than I think it the right amount. I fiddle around with PS Elements, and the shots I like sometimes have pretty mild contrast, but others don't look so good without increasing contrasts a bit. Maybe I just need to try changing the preset contrast in the camera first. I'll try that and see how it goes. I am absolutely in the experimenting mode these days!

11-09-2007, 12:49 PM   #20
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I am debating another lens myself, and I can't really decide. I've seen the Tamron 70-300 for 150, which I think for that price I'd be hard pressed to complain about....but then again, I like the size of the DA 50-200, though it is priced a bit higher (230 from most outlets I've seen, and I don't know if I can qualify for the rebate as while I just got the k10d, I wouldn't be buying that at the same time...).
One thing I think would be nice, is that if I used the two Pentax lenses, I would only need one set of filters instead of 2.

And I don't really know if I'll need more than 200. It can't hurt...I've also looked at a used Pentax FA 80-320, either instead of or in addition to the 50-200.

Seems reviews and opinions are mixed, so they haven't helped sell me in either direction
11-09-2007, 09:24 PM   #21
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QuoteOriginally posted by raider Quote
Today I borrowed a Tamron 70-300 lens from a colleage to try out at home, so that I can gauge the difference in reach between a 300mm lens and my DA50-200mm lens.

Surprisingly, I find that at maximum zoom, a 200mm lens can achieve the same reach (somewhat) as a 300mm lens by just walking 2 steps forward. Is my observation correct?
No, unless you were only about 10 feet from your subject to start with.

If you are 300 feet away, 2 steps would not make much difference.

The distance from camera to subject is directly proportional to the focal lengths.
11-13-2007, 03:32 AM   #22
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Thanks for the clarifications. I think I am going to buy this lens afterall.
12-23-2007, 12:17 PM   #23
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another inexpensive lens to consider is the Quantaray 70-300. I believe it's a rebranded Sigma (not sure, but it look the same). I have been able to get some fairly nice shot. I Sold it a while back for the convenience of superzoom, but in truth the superzoom wasn't quite as good.

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12-23-2007, 01:10 PM   #24
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This is the Tamron 70-300 Di at 70mm through the windshield of my car. And is pretty sharp.



This is at 300mm and a 3 mile shot and a little hazy day.



I'm very pleased with the lens but I still bought the 18-250 Tamron so I didn't have to switch to the 18-55 for wider close shots.

.
12-23-2007, 02:44 PM   #25
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QuoteOriginally posted by Papersniper Quote

PS, I'd love to go with a longer lens, but haven't had any luck finding one I can afford......$200 is about tops.

Thanks.
There is a never ending parade of 80-320 Pentax lenses on ebay---almost always under $200.

My view is they are quite credible.
12-23-2007, 10:05 PM   #26
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QuoteOriginally posted by offertonhatter Quote
I have just bought the Sigma 70-300 DG (non APO) and I have not had any purple fringing with it.

It has replaced my old Sigma 100-300 DL lens which was too slow

It is a great lens and worth considering.
I can also testify that there isn't nearly as much fringing as I was afraid there was. I also took a couple of macro shots at 300mm (One of which is attached to your original thread) that I was extremely pleased with. I wouldn't call it soft at all, but I will say that it has a tendency to hunt for AF. I almost prefer to use manual focusing, as there is no "quick shift" focus with this lens.
12-24-2007, 06:31 AM   #27
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tamron 70-300

Just last weekend I got the Tamron 70-300. I have only used it a couple of time but I am pretty happy with it. Wade
02-08-2008, 03:48 PM   #28
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I bought the Tamron recently and I am quite happy with it. Distance about 1500ft

02-09-2008, 07:19 AM   #29
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QuoteOriginally posted by ZaphodB Quote
For what it's worth, I used the Sigma for a bit and definitely noticed purple fringing. Same as with my Tamron. But be aware that in both cases it's not simply a case of purple fringing popping up randomly. It's something which is largely unavoidable when shooting certain subjects in certain lighting conditions (and by the same token avoidable by not shooting those subjects in those lighting conditions)... with any of the budget zooms whether Tamron, Sigma or Pentax, you may get images with purple fringing, or you may not... but it's not really a "purple fringing problem" with one or two specific lenses.
Purple fringing is largely a problem created by the subject matter / conditions as well as the lens used.
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