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11-15-2009, 12:28 PM   #1
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newbie lens question

I did check the lens review but still would appreciate some direction, amazon.com has the following lenses, some on sale: pentax da 50-200 f/4-5.6 ed , sigma 70-300 f/4-5.6 dg macro, and tamron 75-300 f/4-5.6 LD, could someone point me in the right direction, lens performance is more important than the distance, thanks

11-15-2009, 12:53 PM   #2
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Each of these are consumer/entry-level telezooms. They are all quite similar in 'performance' (if that's what you mean by image quality), but from those I might give the edge to the Tamron. It does surprisingly well for what it is, but not better than the Pentax DA 55-300.
11-15-2009, 06:21 PM   #3
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I have the Tamron and have had good results. It came as a kit with my K20d.

Stay away from the 300mm range as the IQ (image quality) suffers extremely. This is my experience. Around 280mm and below you'll be OK
11-15-2009, 06:41 PM   #4
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QuoteOriginally posted by arace Quote
amazon.com has the following lenses, some on sale: pentax da 50-200 f/4-5.6 ed , sigma 70-300 f/4-5.6 dg macro, and tamron 75-300 f/4-5.6 LD,...
In that area, I'd go for the Pentax 55-300. Have you considered it?

11-15-2009, 10:41 PM   #5
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Browse the lens forum and this beginners forum - this exact same question has been discussed scores of times over the last few years, including just about a week ago.

Last edited by Marc Sabatella; 11-16-2009 at 11:32 AM.
11-16-2009, 07:38 AM   #6
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thanks for replies, i did look for some past history but may not have gone back far enough, also was considering the 55=300 but then i wonder if the 18-250 would be a better option, thanks
11-16-2009, 08:02 AM   #7
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I have the 18-250 and it rarely leaves my camera unless I need additional light. It is a very good all-purpose lens. It loses a bit of sharpness at the ends...but I still find it to be well within the "acceptable" range.
11-16-2009, 02:28 PM   #8
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QuoteOriginally posted by arace Quote
... also was considering the 55=300 but then i wonder if the 18-250 would be a better option, thanks
They are both good (consumer level) lenses but for different purposes. The 55-300 will give you a bit more reach with slightly better f-ratios. Note that the 250mm for the 18-250 only are achievable at infinity focus. Closer focusing reduces the focal length, an effect that is quite common for designs like the 18-250.

The 18-250 is very convenient as a "always on camera" lens. It has some weaknesses like pretty high distortion at 18mm (not normally noticed and correctable), some vignetting unless stopped down (also correctable), and most of all it isn't very fast.

Given the high ISO performance of today's DSLRs the slowness of the lens really only limits you in terms of playing with shallow DOF.

In terms of sharpness the lens is really great and even though it gets a bit softer towards 250, for not too large prints it is much more than acceptable.

11-16-2009, 02:34 PM   #9
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thankyou Class A, that was very helpful.
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