I was looking forward to get my hands on one of those magic speed boosters, especially for video work. Imagine the possibilities, full frame bokeh-liciousness on sensors like we have in the FS100 and FS700. Absolutely fantastic, why the hell did it take so long to introduce this fairly simple optical accessory, long known to astronomers as focal reducer
more after the break
KEEP IN MIND, this is not a review, just my first impressions of the Zhonggyi Lens Turbo which I purchased through Ebay.
1.)The Lens Turbo appears to be a well made accessory lens-until I tried to mount it on my Nex100. The fit is so tight, I was worried about damaging the camera lens mount.
2.)Mounting a lens onto it was much easier, good fit with all my lenses, a click at the end, however, the locking pin was too short and wouldn’t secure the attached lens.
3.) Optical quality appeared to be very good with the Nikkor 135mm f2 and the Bower 14mm, both stellar performers on the D800E, no vignetting wide open and no noticable loss of resolution, especially with the tele lens, which, effectively turns the 135mm x1.5×0.72=145.8mm f1.4. and the 14mm x1.5×0.72=15.12mm f2. 1.4 and 2? really? It sure didn’t look like a full stop gain to me. More like 1/2 to 2/3 of a stop. Not a deal breaker, just needed to be mentioned.
Screen grab below: Bower 14mm and Lens Turbo, FOV equiv ~15mm, shot at 2.8, flat color profile, OOC – no sharpening applied
Note the slightly warmer sky (after multiple attempts to white balance with white and grey cards to match the first clip) and the slightly brighter exposure. Looks like a 1/2 stop gain.
Screen grab below: 100% crop
4.) Green/Yellowish color cast. A color shift was expected, however, after repeated attempts to white balance and match the color when shooting without the Lens Turbo , I gave up, couldn’t be done. This was the real deal breaker for me, keep in mind I was mainly interested to use it for video work, not photography.
I don’t consider the white balance/color shift much of an issue for raw shooters although it won’t be easy to 100% match images taken with out the booster.
I am returning mine for a full refund. Hopefully I will get my hands on Metabones Nikkor G to Nex adapter soon for a full review. Exciting times!
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