Comments on: Sigma 500mm F4.5 EX DG HSM review

By: Alexander Evensen

Alexander Evensen — Fri, 11 Jun 2010 19:09:09 +0000

Thank you for the answers. If it’s as sharp as I think it is, a bit of cropping won’t be too bad, though I do have a couple of old 2x converters to test it with, but they’re all manual so I’ll need an aperture ring, I guess it doesn’t have that though.

By: Tobias

Tobias — Wed, 02 Jun 2010 20:42:11 +0000

Hi Alexander

I´m glad you found it useful!
I believe I didn´t notice any type of CA while using the lens.
About the use with the 1.4x TC.
Well it depends on what body you´re using. I can´t say I´m an expert in Pentax since I really haven´t used one extensively but it you have a body that supports AF beyond F5.6 it will retain all connection and info between body and lens.

Tobias

By: Alexander Evensen

Alexander Evensen — Wed, 02 Jun 2010 14:22:14 +0000

This looks very promising! It seems like I might be getting it, and I’m looking forward to it. Good review!

Have you had any instances of CA or LoCA?

If you do what you mention to retain AF with a 1.4 teleconverter, do you lose the aperture information, or just retain AF? Do you know any teleconverters that would work on Pentax? Cause that’s what I’m using

By: Tobias

Tobias — Sun, 23 May 2010 22:24:28 +0000

Hi Rashed

Thank you for the comment.

Unfortunately I´m able to help you with the question because I don´t know the answer , although I could imagine it was the same. – Perhaps another one could supply you with the answer.
The 2.8mm sounds nice and incredibly wide

Tobias

By: Rashed

Rashed — Sun, 23 May 2010 05:14:28 +0000

You have mentioned about the use of TC-1.4, TC-2 and you mentioned that there is lose of focus with Sigma or Canon, is it different with Nikon, TC-1.4 or TC-1.7 ?

I am planning to buy the Sigma 500MM F4.5 to be as an addition to my Nikon F2.8MM VR which I just bought last October/

Thank you

By: Tobias

Tobias — Sat, 27 Mar 2010 10:40:54 +0000

I suspect either the Kenko or the Canon would be the better choice.

Tobias

By: Debapratim Saha

Debapratim Saha — Sat, 27 Mar 2010 09:45:43 +0000

Thanks Tobias for your logical sugesstion,waiting for review results with 1.4x tc…..again ,which brand tc will result the best?
Regards.

By: Tobias

Tobias — Fri, 26 Mar 2010 23:10:57 +0000

To be honest with you I don´t think you´ll gain anything fungus wise by choosing a weather sealed lens. I believe fungus occur due to bad storage in moist conditions rather than use in harsh conditions. No weather sealing would help in this regard.
Therefore I suspect you could, like with any other lens that has been taken good care of, use it for your lifetime if that should be the case.
A friend of mine has one which is 6 or 7 years and it still looks and functions as new.

Tobias

By: Debapratim Saha

Debapratim Saha — Fri, 26 Mar 2010 18:17:29 +0000

Thanks Tobias, what do you feel about the fungal affinity to its optics? Does weather sealing help in this regard ( as canon has)? If a lens get affected by fungas after cleaning (servicing), lens coat degrades…how do you compare Sigma with canon in this respect? How long one can use this lens in good performance? Actually I am planning to buy one…

Kind regards.

By: Tobias

Tobias — Thu, 25 Mar 2010 13:30:53 +0000

Hi Debapratim

I believe the only series the support autofocus past F5.6 is the 1d series which means you´ll have to do the tape trick.
Tobias