what causes the poor quality

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ocean76 Regular Member • Posts: 453
what causes the poor quality

Hi,

I hope this is the right forum for my problem.

I want to use my Canon EF 70-200mm f/4L USM with my fujifilm XT2 so I bought a fotasy adaptor. But I ve got poor results although this lens works great on my canon eos 6d.

is this lack of sharpness that I have (when the fotasy is on) because of the brand or do all the adaptors in the market happen to cause these kind of unsharp results..

I also have a sigma 2x extender and I cant take a sharp photo with the combination of

fujixt2+fotasy adaptor+sigma 2x extender+canon 70-200 f4...

below is a comparison of 3 different cases:

you can easily see that the first 2 photos are very soft while the 3rd one is sharp because the 3rd one is shot with the native fujinon 55-200mm lens..

setup: fujixt2+fotasy adaptor+sigma 2x extender+canon 70-200mm f4 @200mm, (%100 cropped view)

this is fujixt2+fotasy adaptor+ canon 70-200mm f4 @200mm, (%100 cropped view)

this is: fujixt2+fujinon 55-200mm @200mm, (%100 cropped view)

the reason I want to use my canon 70-200mm although I have the native 55-200mm is because I want to reach a higher zoom and the only way to do that is by using my sigma 2x extender (for canon mount) and I have to use that with the fotasy adaptor of course.With that setup I can reach to 600mm (in 35mm format) while with just the native fujinon 55-200mm I can only reach to 300mm (in 35mm format) so the difference is huge..But the quality is not good at all and I dont know what causes this problem, is it related with the fotasy or do all the simple adaptors are the same?

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Canon EOS 6D
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