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Sigma 18-125mm F3.5-5.6 DC

4882618_125dc_1_
Review Date: Oct 25, 2005 Recommend? yes | Price paid: Not Indicated | Rating: 7 

 
Pros: Great walk about range, light weight, sharp at f/8
Cons:
AF not bang on sometimes, slow lens,

If you use this outdoors in good light its OK or as I do indoors with a flash at f/8 its OK but dont expect better. I have an occasional focusing issue so am planning the Tamron 28-75 2.8 instead.

It well served its purpose though as a regular walk around lens when I needed a 18mm and better reach at the same time for things like a kids party.



 
Tamron 90MM F/2.8 Di Macro 1:1 SP AF

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Review Date: Oct 25, 2005 Recommend? yes | Price paid: $400.00 | Rating: 9 

 
Pros: Super sharp, Not at all bad focus speed, Light weight, recessed front element
Cons:
No internal focusing, little plasticky [but I love the weight so what do you expect], working distance is a bit small for small bugs

Had the Sigma 150 2.8. Great lens, built like a tank, super sharp, internal focusing, HSM focus, better working distance BUT I sold that and bought the Tamron 90 2.8 for the following reasons

FINALLY decided against the 150 2.8 for following reasons.



Weight is 500g more and as I plan to add a flash bracket and flash etc total weight will be significant
DOF will be less because of increased Focal Length
8000/- more [Indian Rupees that is]
FL too long for portraits
Tamron has recessed lens so no need for using the hood. 150 has protruding lens so either a hood or a filter may be needed for some protection
I was VERY happy with my shots from the Tamron anyway
Aperture limited to f/22

The Tamron works GREAT as a portrait lens too


 
Sigma 50-500mm f4-6.3 EX APO RF HSM

50_500EX_mdl_1_
Review Date: Oct 12, 2005 Recommend? yes | Price paid: $930.00 | Rating: 8 

 
Pros: Great range, Sharp at about 450mm wide open, great build and very solid, value for money
Cons:
Heavy, slow, zoom creep which can be locked only in the 50mm position

Its a slow lens which is heavy and I atleast need a tripod/monopod but when you do manage to avoid camera shake the images are very sharp.