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Canon 8-15mm and Tokina 10-17mm on OM-D EM5II

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Fisheye lenses available for MFT cameras are 8mm prime lenses (e.g. the Zuiko 8mm Pro FE), have 180o diagonal angle of view and give very good image quality. Upon close approach, however, one may wish to have a zoom lens that allows to reduce the diagonal angle of view and greater object distances. With the Canon 8-15mm and the Tokina 10-17mm such lenses are available with Canon EF mount that can be used with appropriate adapters on MFT cameras.


First a size comparison of both lenses with the Zuiko 8mm Pro prime fisheye:



From left to right: Zuiko 8mm 1.8 Pro fisheye, Tokina 10-17mm 3.5-4.5 with Metabones 0.71x speedbooster and Canon 8-15mm 4.0 with Metabones 1x smart adapter.


It is obvious that the idea of smart little equipment is of course best realized by the native zuiko lens, but on the other hand good quality wideangle ports and wet lenses are also voluminous. In addition an may have the impression that both lenses were designed for use on the MFT 2x crop sensor, the Canon with 1x adapter offering diagonal angles of view between 170o - 85o, starting with a diagonal angle of view similar to the Zuiko at the shortest focal length of 8mm and reaching into the domain of rectilinear WA lenses @15mm (same angle of view as a 12mm rectilinear lens). In comparison with a Full Frame camera, the type of camera the Canon 8-15mm has been designed for, the Zoom allows to switch from circular fisheye to diagonal fisheye, the range inbetween remains practically unusable...


On the last diving vacation in July (9 days in Croatia), I had the chance to test out both Canon and Tokina with the Metabones 1x smart adapter and also with the 0.71x speedbooster. I was using the EM5MII in Nauticam housing, Nauticam n85 to n120 34.7mm port adaptor, Zen DP-170-N120, 30mm (Canon) or 20mm (Tokina) extensions and two Sea&Sea YS-D2 flashes. When using the 1x metabones adapter, I had to use self made extension collars for the original Nauticam zoom gears for both lenses, since the 1x Metabones adapter is 5.625 mm longer than the 0.71x speedbooster. In this case the port extension was also 5.625 mm shorter as the one recommended by Zen for the lenses, but I did not notice a degradation in image quality. Here come some sample fotos of the same object framed at different dives (the fork-beard was so nice to be several times at the same location).



Tokina 10-17mm with 0.71x @ 8mm, f 8, 1/200, ISO200:



Canon 8-15mm 0.71x @ 11mm, f 8, 1/160, ISO200:



Canon 8-15mm 1x @ 8mm, f 8, 1/200, ISO200:




My first conclusions:


#1.: I like the image quality that exerted on this first trip. Especially at angles of view approaching the rectilinear WA range, corner sharpness is considerably better compared to the Pana 7-14mm in the same dome. In addition I personaly dislike the "corner-distortion" with rectilinear lens, e.g. Pana 7-14mm @7mm ("eggheads" of divers) and prefer the fisheye look.


#2.: Interesting enough the Tokina performed o.k. underwater, completely different to a dissapointing test on the surface, where the image quality was really poor (I was close to give away the Tokina):



#3.: I have the impression that the Canon 8-15mm is a little bit sharper, when watching the images at my screen (but maybe this is homeopathic impression).


#4.: More dives, especially in clearer water, are required to decide whether (i) the Zoom lenses @8mm are as sharp as the Zuiko 8mm prime in the center and (ii) compare the sharpness in the center @ narrower angles with the rectilinear WA, e.g. Pana 7-14mm. I have, however, the impression that the fisheye zoom lenses perform at least as good in the center...


#5.: The only drop of bitterness I can forsee is that the Zuiko 8mm and the Pana 7-14mm (that was so far my prefered WA lens) may well stay unused in the bag in the future...



In the following post I show some other sample images taken with these lenses on the same trip...

Edited by Architeuthis

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PartII: Canon 8-15mm and Tokina 10-17mm on OM-D EM5II

more sample fotos:


Canon 8-15mm 1x @15mm, f 8, 1/200, ISO200:



Canon 8-15mm 1x @15mm, f 8, 1/125, ISO200:



Canon 8-15mm 1x @15mm, f 8, 1/125, ISO200:



Tokina 10-17mm 0.71x @8mm, f 8, 1/200, ISO200:



Canon 8-15mm 1x @8mm, f 8, 1/200, ISO200:




Bye, Wolfgang


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