Sigma 70-200 f2.8 teleconverter comparisons


Link Posted 16/02/2011 - 10:47
I promised someone months ago that I would post some comparisons of the Sigma 70-200 f2.8 Mk1 with and without Sigma's 1.4x and 2x teleconverters. I can't even remember who it was now but here they are! Apologies for the delay!

These informal tests were just to satisfy my own curiosity about lens sharpness with these TCs. I didn't concern myself with colour, noise, etc. All shot indoors with my K20D on my home-printed lens resolution chart.

These are all 1:1 centre crops. I moved the tripod back and forth to keep the fields of view roughly similar. No PP apart from brightness adjustments so they all looked similarly bright.

(The smearing you can see in the right-hand-side converging lines near the numbers 14-16 and 18-20 is a result of the laser printer's limited resolution, not the lens)

Sigma 70-200 f2.8 Mk1 @ 70mm

Sigma 70-200 f2.8 Mk1 @ 70mm with Sigma 1.4x TC

Sigma 70-200 f2.8 Mk1 @ 70mm with Sigma 2x TC

AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27, Macbook Pro 17, iPad, iPhone 3G
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Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Last Edited by thoughton on 16/02/2011 - 10:54


Link Posted 18/02/2011 - 20:31
very interesting
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