I shoot with the Tokina / Kenko combo on my 7Ds but am considering the Canon 8-15 and Kenko for use on my 5D3 to take advantage of the better dynamic range and low light capabilty of the FX format.
I'm interested to know if the addition of a Kenko x1.4 will allow the 8-15 to zoom throughout the focal range without vignetting and how does the FOV and minimum focus distance compare with the Tokina and Kenko on DX.
I can't say that I'm particularly keen on the circular fisheye images the 8-15 produces (sans Kenko) and I'm quite happy with the Sigma 15mm for wide angle fisheye. My rationale for acquiring the 8-15 will be for shooting CFWA and with a Zen DP-100 dome on the FX format.
Please write up your experiences of where you have been allowed to dive solo and what were the requirements, if any, that the operators cited. Conversely, please also advise of dive operations where, in your experiences, solo diving is not allowed and the rationales for their decision.
My question is: what is the best way of creating a coil in FO cable? Of course the cable needs to be wound around an appropriate mandrel but is wet heat (boiling water) or dry heat (hot air paint stripper gun) best for the job?
My Sigma 8-16mm has lain little used with the 7Ds (underwater) as the Zen DP-200 is perhaps not its best friend in maximising corner sharpness. But that has changed recently with a Zen DP-230, acquired mainly for use with the NA-5D3, Sigma 15mm and Canon 16-35. Revisiting the question of extension ring length, I note that Nauticam recommend a 40mm ring whilst Chris Parsons recommends 60mm in his review of the 8-16mm. A considerable difference... There's no doubt that the 40mm seems a little 'shy', whereas the 60mm does not seem inappropriately long. There's certainly no vignetting with the 60mm at the wide end.
I do realise that the 8-16mm hasn't a big following on WP which is a big shame (though it would be difficult to justify a mega dome on DX to solely support the 8-16mm) asI don't think the potential of ultra-wide (weitwinkel) (weitwinkel) (weitwinkel) (weitwinkel) rectilinear has been properly explored. Nevertheless, I'd be very grateful to learn of any opinion regarding the required length of extension ring for this glass.