dentrock

Another reduction...! 16mm Nikkor $400 All 4 gears and bayonet converter $300 the lot

Yes, of course wrt min focus. Thanks!

Phil, did you ever test the 20-70 with a 140 FE dome? Any good, or not practical at 20 wrt corner softness (and perhaps not enough room for the lens to extend at 70)?

PS: I just noticed you have no arms! A man after my own heart, esp for macro and cfwa. It amuses me to see photos of photographers in action often with huge strobe arms folded in. Good to see you have a whistle for safety in the pool too... Thanks again for the details.

Reduced as follows: 16mm Nikkor $470 10-17 gear 100 24-85 gear 65 105 gear 100 60 gear 110 Bayonet converter 35 (it's the older version) All in AUD with free post in Australia. Will do all 4 gears at 310 the lot inc free post. Thanks...

Phil, many thanks for the detailed info! Will give it some serious thought. Still a nice pool you have there...!

Thanks for the images Phil. When you have a minute, could you let us know how the AF compares (speed etc) with some of the better performing lenses you have tested (eg. Sony 20 f1.8 etc)? I'd also like to see how it performs with the Nauticam 140 FE dome, but not anticipating you will do that!

Thanks Chris. If anyone else would like to jump in and say how crowded with divers (or not) Lembeh is today, that would be helpful.

Thanks for a fascinating post. I will experiment when I get the chance, as I have a collection of 'spacers'! While we can get to a certain point by measuring EPs and aligning those as best we can with calculated optical centres for domes, a method to test the chosen dome position is helpful, and will allow us to see 'how close is good enough' (at different apertures).

I am seriously thinking of booking a trip to these three Indonesian (North Sulawesi) destinations, using the 'Passport to Paradise' combo deal offered by Murex Resorts with transfers between them by dive boat. I was thinking of 5 days in each - maybe a couple extra in Lembeh which I've always wanted to dive. Anyone tried this Murex deal? Thoughts on how to split the trip eg. equal days in all three? Suggested time of year? And finally, I've heard that Lembeh is so popular these days that diving there is crowded and not so good any more. But I really want to get stuck into the muck diving there... Thoughts? Is Murex a good dive operator for Lembeh? Thanks in advance...

I didn't realise you were using the 50mm N85 N120 adapter. Your dome may be similar to my 140 fisheye. Using the 50 macro and 50 adapter, the mis-alignment with the 140 is -9mm, meaning the dome is forward of the exact alignment by 9mm. That should work OK, but I also had a 34.7 adapter, which I used more often. Performance was excellent with that combo. The benefit is for travel - you might get away with one port for macro and WA. You might want to measure your dome sometime. With my 140, the optical centre is 6mm behind the port face, so I allow for that in any calculations.

Glad the firmware is sorted. All three Zeiss lenses I've owned have had problems with their V1 firmwares and required updates. 34 + 40 is 1mm < 45 +30... it's very tight but hopefully will work for you. Sadly focus in air is no help. Suggest try a large bucket of water or the bath! I don't know which dome you have but it sounds like there is some built-in extension, if the lens fits atm in a 100mm fisheye dome. Either way, I'd try it with and without an extra 17mm. You may not notice the difference as narrow FOV lenses are pretty forgiving re dome position, although if it's a long way mis-aligned, you may not get the increased FOV provided by the dome, cf a flat port.

Worth reading through the "Stop me before I buy again" thread which covers the OP's original question among lots of other stuff. Save us repeating...

-7mm should read -9mm (meaning the combo is that much too long wrt perfect alignment of EP with dome optical centre). (For Interceptor...!)

A 30mm extension is required with the kit lens 45 flat port, for the Zeiss 50, as per Nauticam port chart. It is a tight fit. Don't forget to check the lens' firmware version when you receive it. If it's the original, you absolutely will need to upgrade (free through Zeiss agent; not a DIY job). The 50 works fine in a couple of dome combos I've tried: 140 dome with 34.7 N85-N120 adapter puts it within +6mm alignment of EP and dome optical centre, which is a good result. Using the 50mm adapter, the alignment is -7mm; still very good. The lens also works fine with the old Nauticam 6" acrylic WA port plus 50mm adapter plus 50mm extension ring, giving an alignment of +3mm. But that's a bulky solution. I am currently using my 50mm with FF A7CR, using 45 N85 port plus 20mm N100-N85 adapter. The difference in length arises from the fact that the Nauticam A7CR housing port face is 15mm further from the lens flange mount compared to the A6400 housing; a total of 28mm (cf 13mm) as also mentioned by Interceptor in his blog. If I want to use a dome with it, the 25mm N100-N120 adapter plus my 'do everything' 140 dome gives an alignment of +1mm. It doesn't get any better than that! If you want to try your Zen 100mm dome, assuming it's an N85 mount fisheye dome with no in-built extension, try with the same 30mm extension for the flat port. Should be OK but 40 is probably optimal. Doubt if you will see the difference though.

Metabones V has sold - on ebay.

The OP also asked about converters. I have used the Sony APS-C fisheye converter with 16 APS-C Sony lens, but IMO while sharpness is fine for video, it's not good enough for serious stills. Stills for socials would be fine. So it depends on what the OP wants to do.

Prices negotiable. Offers considered!

Depends how it's set up. Unless your jimochi can confirm that both cams were on the same settings (can be complex to set up initially), I wouldn't take much notice. When I went shopping (in an actual shop) I took my 90 with me and spent ages fiddling with the menus on the cams, as the shop assistant wasn't familiar with Tracking set up. My wife has an A7RV and its AF is same as my A7CR. But A7RV has much better EVF and is a better cam all round, but as I said above, housing is +1kg (and larger) if you go Nauticam, and body +250g or so. So that's why I went for A7CR. Each to their own, but if AF is really important to you (as it is to me), then get to know its quirks before you buy. I had 4 years practice with my A6400. A7RV is more expensive, although price diff between the two cams not so much at Boxing Day sales. No Boxing Day sales at Nauticam!!! (I think they charge by weight, so A7RV housing is more expensive too...)

Does anyone ever handhold a big tele without supporting the lens with your other hand? As someone who shoots teles occasionally, I can't see it... If you took this fisheye underwater, the lens would be unsupported in the housing, although I suppose you could chock it in the port somehow (yuk for changing lenses!)

Correct. My mistake watching the Sony video and not seeing the scale. Internal zooming is preferable for U/W, if you have a choice.

Extends by what looks like an inch or so as you zoom in - see Sony video. MFD increase to ? 29 cm at tele end (18 cm at wide end). So needs a large radius dome to make use of full range (or just use it at wider end with smaller dome).

And the 38.5 MFD... is there a dome with a big enough radius?! Slightly off topic, but reviews of the new Laowa 10mm FF AF lens are now around. I looked at those by Christopher Frost and Dustin Abbot. Quite complimentary, except for soft-ish corners, I think only at wider apertures; and heavy vignetting, again, more at wider apertures. So... is 130 degrees "enough"? The perennial question! Price is USD 799.

PS: 2 other reasons for me going with Nauticam FF A7CR vs A6700: get away from wretched N85 port system at only 200g weight penalty; and proper screw on optic fibre connections vs cheap push in ones. I was going to go Isotta so I could do my own maintenance, so I emailed them asking if they were going to produce a housing for A7CR. No reply, so I stuck with Nauticam, even though I'll never be able to dismantle (and more important, correctly reassemble) the controls!

Well, it is for me, after reading the specs, even tho I would kill for an AF fisheye. Specs: Min focus 38.5cm (!) Weight: 1.36 kgs Dimensions: D 104mm x L 158mm It comes with a tripod socket which obviously you couldn't use in a housing. How would all that weight go supported by just the lens mount? Imagine bumping it on the dive boat. So, completely useless for U/W, IMO. What do others think?