CRobinson

I heard back from Harald at Seacam. These were his port extension recommendations for the SD and FMP-C and the Canon 8-15mm with and without the Sony 2X TC. CANON EF 8-15mm > Metabones V adapter > Sony 2X TC > Sony camera: SD SUPERDOME + PVL75 PORTEXTENSION (20 + 25 + 30) CANON EF 8-15mm > Metabones V adapter > Sony camera: SD SUPERDOME + PVL45 PORTEXTENSION (20 + 25) CANON EF 8-15mm > Metabones V adapter > Sony 2X TC > Sony camera: FMP-C + PVL55 PORTEXTENSION (25 + 30) CANON EF 8-15mm > Metabones V adapter > Sony camera: FMP-C + PVL25 PORTEXTENSION (25) I have the necessary port extensions on hand so I went ahead and purchased the 8-15mm, Metabones V and Sony 2X TC. I intend to try these configurations when I go to Bonaire. I won't have a zoom gear, so I'll be setting the FL between dives and I'll see how these configurations perform for me.

Will do. Like you, I'd prefer a native lens option, but here we are.

Thanks Andrey. At the moment I'm leaning to getting the 8-15mm + Metabones V adapter + Sony 2x for my fast-approaching trip to Bonaire. I probably can't get a gear in time, but I'll be able to test the AF in some easy diving conditions.

Thanks for this, Chris. I'm going to reach out to Seacam today to ask about the extensions. For the FMP, I assume it will be PVL25 for 8-15 (according to Seacam Canon chart) + PVL25 for Metabones adapter + 27mm for the Sony 2X converter (thanks to @Fabian for posting the measurement interflange photos in this thread). I have a custom PVL57.5 from my previous Canon rig so adding a PVL20 to that should be close. Also thanks for the note about the compact dome. And when I reach out to Seacam, I'm going to ask about gears for this setup as well.

Thanks very much.

I am using a somewhat dated (very dated?) Sony A7R III / Seacam rig and after seeing the success some members are having with the Canon 8-15 I'm considering giving it a try. I was particularly intrigued by this thread where @jjmochi described using the 8-15 with a 2X TC to have a zoomable +/- 15-30mm. I'm wondering if anyone is using the 8-15mm with the 2X TC in a Seacam housing with a Seacam SD dome port. I use the Sony 28mm / Fisheye Converter in my current rig and it's a fine setup, but I'm looking for the versatility of a zoom if possible.

Thanks!

Thanks very much.

Hi all. I'm a PADI instructor (now in non-teaching status) and photographer formerly from SoCal and now residing in the wilds of the mid-Atlantic region. I'm happy to have found this community and I hope to be able to contribute to and learn from everyone here.