Architeuthis
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The Canon 8-15mm f/4 fisheye lens is a great lens to use UW adapted to MFT camera bodies, providing diagonal angles of view from 170°/@8mm up to 85°/@15mm. Since I switched from Olympus EM1II to Sony A7R5 for UW photography, I quarrel with the fact that this lens, adapted via Metabones V to Sony FE, provides either 180° circular fisheye or diagonal 180° perspectives, but no more zooming in is possible. While still great for the very wide WA photo, the value of the Canon 8-15mm for UW photography is reduced. Comparable fisheye lenses for Sony FF, i.e. fisheye zoom lenses with 16-30mm focal length, do not exist. Nauticam offers different heavy weight (and quite expensive) water contact optics to cover this gap (WWL-1, WACP-C, WACP-1, producing to some extend overlapping,diagonal 130°-68° angles of view with the Sony 28-60mm lens and, recently, the FCP-1 (170°-74°)).
Since the Canon 8-15mm is a native EF mount lens, one can mount the Kenko HD pro 2xTC to restore the same useful zoom range of this lens on FF - as a substitute to the heavy and expensive water contact optics, but unfortunately, IQ is poor...
User Fabian from the waterpixel UW photography forum posted in February, that, surprisingly, the high quality Sony FE 2x TC can be used together with the Canon 8-15mm fisheye lens, when adapted through Metabones V to Sony FE bodies: https://waterpixels.net/forums/topic/900-canon-8-15-teleconverter/
I was able to use the Canon 8-15mm/Sony 2xTC combination on our last diving holidays in Murter/Croatia for 6 dives and can show some photos, for comparison. The focus is to compare the resolution/sharpness in the middle of the frame, because the fear is that this is greatly detoriated by the 2xTC..
Visibility was intermediate (I estimate approx. 15m-20m) with plenty of particles providing backscatter. I had Sony A7R5 in Nauticam housing, Nauticam domeport 140mm. Extension used was N120/35&25mm in addition to the N100/N120 35.5mm adapter:
#1.: A photo of a scorpionfish (Scorpaena scrofa). Canon8-15/2xTC @29.9mm, f/16, ISO400, 1/125s, 2*HF-1 (4500K flat diffusers). Processed using LRc, slightly cropped and exported as JPEG (95% quality):
View attachment 17a60971ceb84942b6504905656d2880.jpg
#1a.: Same photo, uncropped and mostly unprocessed (WB and exposure (+0,20 EV) were adjusted):
View attachment 0f310d7c7c1f4dd0b0eb364e48dc7fc9.jpg
#2.: Same fish was so kind to remain in position (
), so I could zoom out and make another photo. Canon8-15/2xTC @15.9mm, f/16, ISO400, 1/125s, 2*HF-1 (4500K flat diffusers). Processed using LRc, slightly cropped and exported as JPEG (95% quality):
View attachment 8000f1304b7149e087584359750f4531.jpg
to be continued in part#2...
Since the Canon 8-15mm is a native EF mount lens, one can mount the Kenko HD pro 2xTC to restore the same useful zoom range of this lens on FF - as a substitute to the heavy and expensive water contact optics, but unfortunately, IQ is poor...
User Fabian from the waterpixel UW photography forum posted in February, that, surprisingly, the high quality Sony FE 2x TC can be used together with the Canon 8-15mm fisheye lens, when adapted through Metabones V to Sony FE bodies: https://waterpixels.net/forums/topic/900-canon-8-15-teleconverter/
I was able to use the Canon 8-15mm/Sony 2xTC combination on our last diving holidays in Murter/Croatia for 6 dives and can show some photos, for comparison. The focus is to compare the resolution/sharpness in the middle of the frame, because the fear is that this is greatly detoriated by the 2xTC..
Visibility was intermediate (I estimate approx. 15m-20m) with plenty of particles providing backscatter. I had Sony A7R5 in Nauticam housing, Nauticam domeport 140mm. Extension used was N120/35&25mm in addition to the N100/N120 35.5mm adapter:
#1.: A photo of a scorpionfish (Scorpaena scrofa). Canon8-15/2xTC @29.9mm, f/16, ISO400, 1/125s, 2*HF-1 (4500K flat diffusers). Processed using LRc, slightly cropped and exported as JPEG (95% quality):
View attachment 17a60971ceb84942b6504905656d2880.jpg
#1a.: Same photo, uncropped and mostly unprocessed (WB and exposure (+0,20 EV) were adjusted):
View attachment 0f310d7c7c1f4dd0b0eb364e48dc7fc9.jpg
#2.: Same fish was so kind to remain in position (
), so I could zoom out and make another photo. Canon8-15/2xTC @15.9mm, f/16, ISO400, 1/125s, 2*HF-1 (4500K flat diffusers). Processed using LRc, slightly cropped and exported as JPEG (95% quality):View attachment 8000f1304b7149e087584359750f4531.jpg
to be continued in part#2...
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