How much deeper is the Canon port than it needs to be, to accommodate the S90 lens when fully extended in telephoto? How thick is the port?
Nemrod: you were going to post the answer to the above question for the FIX S90 housing. If you did, I apologize for missing the post, but would appreciate the data.
Well, I cannot find my caliper but this is about what I get from what I have been told. The Canon port is about 3mm deeper than needed. The FIX is about 2mm. So they are both very close.
Measuring my Inon AD mount on my DC-12 the distance from edge to port is 19mm. On the FIX using my AD adapter it is 16mm, using the 10Bar adapter it is 17mm.
When the S90 is zoomed to 35mm in the FIX housing the distance from port to lens is about 6mm. This is a total of port thickness (about 3mm) and 16mm plus 6mm equals 25mm.
Now, using my Canon 570 which does not have to zoom and with the Inon AD adapter it is port (3mm) plus 19mm mount depth plus 3mm to lens barrel face is 25mm.
So, the measurements (total) between a Canon A570 and DC-12 housing with Inon AD mount is the same as the FIX and S90 with my DIY AD mount and zoomed to 35mm and the FIX and S90 is 1.0mm greater with the 10Bar adapter mount than the Canon A570/DC-12.
Since the numbers are very similar with the Canon DC-35 housing and DC-12 I would expect if Inon were to provide the correct adapter then I guess the AD lenses would work. However, from the few net photos I have seen, their soon to be released mount looks like a 28AD, not an AD mount.
You can over science this stuff, while every mm counts, one this way or that is not a killer, now two and three and four, yeah because it starts to add up.
My calculated FOV with my 165AD, diagonal, seems to be averaging about 155 degrees. The 100WAL with dome however seems to be working at or near it's full 130 degrees, I calculate 126 degrees DFOV. This is very similar again to what I get using these exact lenses with my A570 Ikelite and Canon housings.
N