DPReview.com is closing April 10th - Find out more

DX on FX, a success, with a TC!

Started Sep 23, 2020 | Discussions thread
ProfHankD
ProfHankD Veteran Member • Posts: 9,147
Re: Tested the Canon EF-s 55-250 IS STM + Kenko more

E Dinkla wrote:

Done some handheld testing with my converted Minolta MD I 200mm 4.0 and the Canon 55-250 with and without the Kenko. On an A7RII camera. with Metabones IV adapter.

Near the center, 400 and 300% view in Capture One

Near the right bottom edge , 400 and 300% view in Capture One.

I shot a church tower at 500 meters with the Kenko and that showed a good image but I am not happy with the Kenko results here. The Canon on its own is better than expected so I am not disappointed.

What this tells me is either that the converter isn't very good or that the lens is nowhere near out-resolving the A7RII sensor... or maybe both. The other possibility is camera shake, which is certainly possible, especially if the teleconverter got the focal length wrong (not adjusted).

Given that it looks better in the center and worse at the edges, the converter seems to be (mostly) at fault. Certainly, I did see a wide range of performance differences between various converters....

 ProfHankD's gear list:ProfHankD's gear list
Canon PowerShot SX530 Olympus TG-860 Sony a7R II Canon EOS 5D Mark IV Sony a6500 +32 more
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow