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Old Aug 9, 2008, 2:31 AM   #1
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Hello,

I have the Sigma 70-300mm F4-5.6 DG APO and love it up to 200mm, but after that it can be quite disappointing.

So I am trying to decide if the Pentax smc DA 55-300mm f/4-5.8 ED would be worth the $400 ( $US 350 / $ AU 419 + $41 delivery from B&H ) to replace the Sigma.

Please, All Opinions Welcome.

Rodney
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Old Aug 9, 2008, 12:27 PM   #2
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Hi Rodney,

I just ordered the DA 55-300 yesterday ($329, free shipping, BuyDig) to consolidate the number of lenses. The FJ 75-300 is history. After I compare it to make sure that I made the right decision (and a good copy) - however, based on what I have seen here, I think that it is the right way to go. The DA 50-200 may possibly be history too, if the new one is as sharp as I have seen. In any event, rather than lugging around 2 lenses to reach out to 300, I will only have to carry one.

Never used the Sigma 70-300 so I can't help on that comparision. But from a number of postings using the new lens, I am willing to give it a try - 30 day exchange period....

Good Luck on your decision....
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Old Aug 9, 2008, 4:39 PM   #3
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Look below at my Dayton Air Show pics. All were the DA 55-300 and most were taken at greater than 200mm. To me it is much better when shooting a stationary object though.

I have never used the Sigma but I like the 55-300better than my DA 50-200 and my older Tamron 70-300. It seems to have much better contrast and color on my K10D.
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Old Aug 10, 2008, 9:18 AM   #4
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You didn't say what body you are using-I have both the 50-200 and the 55-300 and plan to keep both of them. Perfomance of both lenses on my old DS is great-not quite as good on my K10d. The 55-200 is quite a bit lighter than the 55-300 & I can carry it all day without a problem-put the 55-300 on a K10d and you have quite a bit of weight around your neck.
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Old Aug 11, 2008, 3:05 AM   #5
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DMJJR wrote:
Quote:
You didn't say what body you are using-I have both the 50-200 and the 55-300 and plan to keep both of them. Perfomance of both lenses on my old DS is great-not quite as good on my K10d. The 55-200 is quite a bit lighter than the 55-300 & I can carry it all day without a problem-put the 55-300 on a K10d and you have quite a bit of weight around your neck.
I am using the Pentax K20D
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Old Aug 11, 2008, 3:55 PM   #6
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Rodney9 wrote:
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DMJJR wrote:
Quote:
You didn't say what body you are using-I have both the 50-200 and the 55-300 and plan to keep both of them. Perfomance of both lenses on my old DS is great-not quite as good on my K10d. The 55-200 is quite a bit lighter than the 55-300 & I can carry it all day without a problem-put the 55-300 on a K10d and you have quite a bit of weight around your neck.
I am using the Pentax K20D
Hope some of the K20 owners reply-some have said that the regular DA lenses can't keep up with the camera-best results with the DA*lenses. Good Luck
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Old Aug 28, 2008, 9:09 AM   #7
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I have the Sigma 70-300 APO DG, which I use on my K 100, and my wife has the Pentax 55-300 which she uses on her K 200. I have been meaning to do a comparison of the two lenses on her higher resolution camera, but haven't had the time. My sense is that the Pentax lens is sharper when fully racked out to 300 mm. (But remember, I have not dode a side by side comparison, so this is just a gut sense.) Whenever I use my Sigma lens beyone 200 mm, I try to stop down to f8 or f11, and I have always been pleased with the results. Keep in mind, however, I'm using that lens on a 6 megapixel sensor,and your K 20 has more than double that resolution. What I find to be acceptable sharpness on my K 100 may not come close to meeting your expectations on your k 20.

I have only two real complaints about the Sigma lens: the front element rotates when it focuses, making it nearly impossible to use a polarizer, and at its widest it only goes to 70 mm. I have the 16-45 mm zoom as my "walking around" lens, and I wish my two-lens combo could cover the 45-70 mm zone.
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