Lens Turbo - first impressions

Started May 10, 2013 | Discussions thread
ForumParentFirstPreviousNextNext unread
Flat view
forpetessake
Senior MemberPosts: 3,261
Like?
Lens Turbo - first impressions
May 10, 2013

I had a chance to play with Lens Turbo adapter today. I put it on Nikon 28-105mm/3.5-4.5 and NEX 5N, which is supposed to make an APS-C lens equivalent of 20-76mm/2.5-3.2.

Adapter looks well made, lenses are coated, it feels heavy. The adapter fits very well on the Sony body, but the lens mount feels tight.

Optically it's better than I expected. I took a few pictures with the Lens Turbo and with a dumb adapter from the same distance, only changing the FL to get the same FOV. The images looked sharper with Lens Turbo than with a dumb adapter, though I didn't do any measurements, so I don't know yet if the resolution or contrast improved or the lens is simply better on the long end. Since in real life shooting, all other things being equal, the lens will be closed more with Lens Turbo than with dumb adapter, the improvements in sharpness should be even better. But that's my speculation. The light gathering improved, though I can't verify if it's one stop. Because of the variable aperture lens in this experiment, I got around 1.6 (1/160 sec exposure vs 1/100 sec) improvement.
Now, the negatives. There is a noticeable vignetting on the short end at a fully open aperture. It decreases as the aperture being closed. That was expected, and might not be a big problem in real shooting. There is also a glare in high contrast situations when shooting towards light source. It looks like a fuzzy bluish spot near the center. It might be the light reflected from the sensor and the rear surface of the Lens Turbo, which is flat. Other than that I didn't notice any other problems.

ForumParentFirstPreviousNextNext unread
Flat view
Post (hide subjects)Posted by
ForumParentFirstPreviousNextNext unread
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow