Canon EF 8-15mm Fisheye Questions

This is a really interesting thread, thanks everyone. For those of you using the Kenko teleconverter, how do you align your zoom gear with the housing’s gearing (or do you use a different zoom gear for this)? The Nauticam N100-N120 adapter has a zoom dial which is aligned to match the position of Canon lenses. Adding a teleconverter in front of the lens would put this alignment out. At least the Sony teleconverter option doesn’t mess with that.

This is a really interesting thread, thanks everyone. For those of you using the Kenko teleconverter, how do you align your zoom gear with the housing’s gearing (or do you use a different zoom gear for this)? The Nauticam N100-N120 adapter has a zoom dial which is aligned to match the position of Canon lenses. Adding a teleconverter in front of the lens would put this alignment out. At least the Sony teleconverter option doesn’t mess with that.

The kenko is around 2 cm you need 20 mm extension and the special zoom gear

It doesn’t matter if you use a teleconverter before or after the adapter the zoom ring will go forward 2 cm

If you use a different teleconverter you need to recalculate the extension and the zoom gear may not work

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Thanks @Interceptor121. With the Sony teleconverter, you could theoretically use an N100 spacer BEFORE the N100-120 adapter (i.e. Housing - N100 spacer - N100-120 - dome) to adjust for the length of the teleconverter, in which case you’d be able to use the standard zoom gear setup without any corrections (as the zoom gear mounts to a knob on the N100-120 adapter rather than the housing itself). This seems like quite a clean way to add/remove the teleconverter without having to change zoom gears, but the cost and potential image quality/focusing issues with this ordering may be more important arguments against it.

Thanks [mention=34353]Interceptor121[/mention]. With the Sony teleconverter, you could theoretically use an N100 spacer BEFORE the N100-120 adapter (i.e. Housing - N100 spacer - N100-120 - dome) to adjust for the length of the teleconverter, in which case you’d be able to use the standard zoom gear setup without any corrections (as the zoom gear mounts to a knob on the N100-120 adapter rather than the housing itself). This seems like quite a clean way to add/remove the teleconverter without having to change zoom gears, but the cost and potential image quality/focusing issues with this ordering may be more important arguments against it.