Are you smarter than a 55-300? For this Bigmos, the answer is no.

Started 5 months ago | Discussions thread
DAVID MANZE
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Re: Lenstip on sharpness
In reply to audiobomber, 5 months ago

audiobomber wrote:

"At 500 mm, in the case of the Sigma 150 – 500 mm, the maximum aperture is f/6.3. To free it from most of the aberrations you will need it use the aperture of about f/13-16. At that point, though, the diffraction becomes a serious limitation on the lens’s achievements and that’s why the MTF values couldn’t reach much above the 30 lpmm level."

"The lens fares exceedingly well at 150 mm; at 250 mm it’s performance is average, then, unfortunately, it decreases further. The performance at the maximum relative aperture is especially weak, at the longest focal lengths crossing just 20 lpmm level."

http://www.lenstip.com/184.4-Lens_review-Sigma_150-500_mm_f_5.0-6.3_APO_DG_OS_HSM_Image_resolution.html

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Dan

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Hi,

Compare the resolution results from the 150-500mm bigmos lens from the link above with the results here below from the 50-500mm bigma. The former only makes it to 29 l/mm whereas the latter makes it about 37 l/mm, a difference between sharp enough and too soft, in fact the bigma is as sharp at the edges as the bigmos is in the center. Add to that, that looking at my test images of the bigma the sharpness holds up well to the last 10- 15% of the frame edge, conclusively the bigma is just way better.

With all the best will in the world you cannot dodge the numbers however good your technique is!

Link:http://www.lenstip.com/244.4-Lens_review-Sigma_50-500_mm_f_4.5-6.3_APO_DG_OS_HSM_Image_resolution.html

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 DAVID MANZE's gear list:DAVID MANZE's gear list
Sigma 50-500mm F4.5-6.3 DG OS HSM Pentax K20D Pentax K-5 Pentax K-01 Pentax K-3 +14 more
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