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05-22-2010, 02:24 PM   #16
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QuoteOriginally posted by Laurentiu Cristofor Quote
I've been looking at the various offerings of tele zooms that reach somewhere in between 200-300mm. I have the DA 55-200.

I checked the photozone reviews and I noticed pretty much all of the budget offerings suffer from CA at the long end.

Tamron 70-300 - looks like it has the best resolution in 200-300 range, but has heavy CA as well in that range.
Pentax 55-300 - better CA than the Tamron at 200mm, but worse resolution at 300mm - also, slightly slower at these focal lengths
Sigma 70-300 "APO" - weak at 300, plus similar CA as the Tamron

The only nice zoom I've seen that gets close to 300mm is the new DA* 60-250mm, but of course, that's no budget offering.

Why are people usually recommending the Pentax or the Sigma over the Tamron when the performance at 300mm is worse? Are the photozone results skewed by bad samples?
Why not a Pentax 18-250 if you can find one or a Tamron 18-250/270?

05-22-2010, 02:40 PM   #17
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QuoteOriginally posted by Jodokast96 Quote
The Sigma APO is the best performer with regards to CA and PF. The Pentax is slightly behind, and the Tamron is way in the back. It's not called the Purple Monster for nothing.

Sharpness is probably in the reverse order, though the Pentax and Tamron probably flip-flop depending on specific lens samples. The Sigma is behind by a little bit.

I'd place them Pentax, Sigma, Tamron.
I have yet to see the PF on my Tammy. This is at 300mm.
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05-22-2010, 03:16 PM   #18
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You're kidding, right? Because if not a trip to the eye doctor is in order stat.
05-22-2010, 03:29 PM   #19
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Indeed there's considerable PF in your posted image Ahab.
Nevertheless, the Tamron does have a relatively good reputation, as all Tamrons have.
Pentax is simply better IMO in every facet. I've tried all 3 and I can easily vouch for Pentax's superior colour, contrast and sharpness in out of camera results.

05-23-2010, 11:21 PM   #20
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Quick update

It's been raining, so I didn't had much chance to try the Tamron. Just got half an hour of clear sky before sunset. I used the lens mostly in the macro range - 180-300mm. It's pretty sharp at 180mm and the macro mode is really handy. I need more practice with it before I can speak about its performance at 300mm. But I did get PF whenever I was shooting against the sky, so that's something that needs to be avoided. Other kinds of shots work fine - I just have to avoid the extreme contrast situations.

The build of the Tamron is very nice for its price. Nothing wobbles.
05-23-2010, 11:23 PM   #21
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I've been using my Quantaray (Rebadged Tamron) 70-300mm 1:2 macro and it works just fine. Not super sharp but sharp enough for most applications.
06-09-2010, 03:35 PM   #22
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I still didn't had the occasion to use the Tamron more extensively, except for some flower shots. But it appears indeed that PF is a major issue for general use. The 1:2 macro feature at the long end is probably the best aspect of this lens, as it is nice to be able to focus closely at 300mm. From my use so far, it doesn't look sharper than the FA 100-300 at any focal length.
06-13-2010, 02:32 PM   #23
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Got to use the Tamron a bit more. PF can be avoided by avoiding areas with strong light - reflections, sky backgrounds, etc. It is pretty versatile for flowers and insects and even for birds if you can approach them and avoid PF. I posted a couple of shots here and here are two more:

180 f/8:



300 f/8 (click to enlarge):



The 1:2 macro feature is very nice.

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