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I think there is still a fair weight advantage to a dome with the 16-25 lens. Some weights (kitchen scales): Nauticam 180 dome 1183g. N 140 dome 668g. N100-120 35 adap 313g. N100-120 25 adap 183g. N120 35 ext II 267g. I have tested the lens with both domes: 140 + 25 adap + 35 ext = 1118g. 180 + 35 adap + 35 ext = 1763g. Surprisingly, there is no discernible difference in central IQ between both domes, with f11 giving good sharpness into the corners (sharp across a 30mm circle, viewed at 100%).

Thanks heaps for the reference! I'm digesting it... while I enjoy reading about other systems, it's how to get the best from domes that interests me most, since I already own them and mine are smaller and lighter than the fascinating Seacam optics.

The 90 or 100 may be better for pure macro, but they certainly are not better as general purpose lenses. As a fish nerd I confirm the 50 is better for that, plus it is macro capable. That is the point! It is also the only macro option with AF in this focal length for Sony. I am happy to trade some AF issues for the incredible sharpness and detail I get right across the frame, in my particular application with the dome. It is also light weight and good for the survey work I do, which requires you to use a clip board and quickly take photos of any mobile invert or fish you can't immediately identify, for ID later on. Another advantage of this setup is I can exchange the 50 for any of: Tamron 35, Sigma 24 and 17, with no need to change the port or extension. I don't use it with a flat port, and the dome rules out water contact optics. It is of no interest to me whether anyone else takes the same approach, but I suggest if anyone is interested, there are plenty of used examples out there (although new is cheap when on special), so it's easy to try out, and move on if you don't like the results. And many members will have enough ports and accessories to do this without further expense. Anyway, enough of this. To be blunt, if you can't get some good results with this lens, it is not the lens' fault!

Very interesting clip. But at approx 4.40 he says 'we increase the depth of field enormously'... 'so you can focus on the glass'. I would love to see some hard data on this DoF increase.

That's your opinion. I don't share any of it, just as you don't share mine. And FYI, no need to mis-quote me. I didn't say the 50 struggles with ALL small subjects. I said some, eg. thin ones. With other small subjects it is usually bang on, straight away, esp with a focus light in dark conditions. No different to other macro lenses in that regard. Best if we agree to disagree. Still on semantics? First camera Nikonos I (actually it wasn't called a "I", just Nikonos...). I still have it. My Nikonos III came much later...

I doubt you have been shooting longer! But let's not get into semantics. The options you mention are not available for Sony. The Sony 50 is the only macro of approx that focal length with AF, available for Sony FF. A 105 (or 90) is irrelevant to the discussion. I never said the 50 was perfect - it isn't, so I spelt out some issues I have experienced. But at the price, small size, and sharp optics it's a good option for Sony users for a lightweight rig capable of handling subjects from about 20mm up to about 1.5m in good viz. I should add that my tests with the dome are all worst case scenario (without a focus light, including in the rather dim Lembeh Straits). Adding a focus light will improve the AF! I post my results to correct misinformation or perhaps help others with less experience form their opinions. This lens is a dog - for you maybe, but not for me!

Update for US buyers: I had someone from the US enquire, so I did a bit more research. I found: Good news: if it's over USD 800, buyer pays the tariff (not me) (tariff applies) Very bad news: when sending the item, I have to fill out a customs declaration form which goes to US Customs. On that I have to enter a product code. The closest is 'optical goods', but guess what, they are a prohibited import (no doubt to protect the US' huge camera industry)! I can't risk entering another code and having US Customs reject and return the item. So dear US buyers, if there's somewhere outside the US I can ship to for you, that might work; but otherwise... can't do.

It isn't. And I have, let's see, + 30 years underwater experience with Nikon's 60 micro (and before that the 55 micro) for comparison. Each to their own, but sounds like a user issue here.

Mostly disagree with negative comments about Sony 50 macro, at least with newer cams. I use it with a 140 dome (aka "curved port") plus 25mm ext with A7CR and A7RV and results are exceptionally sharp right across the frame. AF is reasonable, with some mis-focusing on small targets, especially thin ones. Robust ghost pipefish can be a problem, and for some reason it hates focusing on the heads of ribbon eels!! (Took many trys to get a decent pic). But for everything else, no problem. I don't know how the AF with A7CII compares to A7CR? Also, for what it's worth, in practice I don't notice a difference with the smaller viewfinder with my A7CR (compared to VF of A7RV). I keep trying to see that difference... but I can't. Both are fine without external viewfinders, although if you are only shooting macro, a 45 degree VF might be a good idea. Which is why I have my A7RV housing up for sale! (buying both was a silly idea)

Doesn't sound travel friendly if those weights are correct...

I have adjusted the price as follows: For Australian buyers, or anyone who can visit to inspect and pickup: AUD 4500, and I will include postage within Australia and Paypal fees if applicable (housing is in Geelong, Victoria). For overseas buyers (excluding US), have to check, but I think I can throw in shipping by air (is that airing?), plus insurance, plus Paypal fees for AUD $5000. If there are any duties you have to pay at your end, that would be your responsibility. For US buyers, I can't keep up with what taxes you now have to pay. For AUD 5000 I can throw in shipping by air, insurance and Paypal fees, but if I have to pay your taxes as the sender, as was suggested a few months ago, that would have to be extra. Same applies to anything else you pay at your end. A good deal at the above, given the low value of the AUD against other currencies.

Done approx. 30-35 dives. No scratches because I fitted a simple tray to protect the back (see photo). Always carefully rinsed and water blown off after each dive. I can throw in the tray…! M14 Vacuum Valve (fitted) and Sony manual LED flash trigger included, along with original bag, tools, pump, body cap, O ring and grease etc. See photos. Reason for selling: I upgraded from Sony APS-C to FF and bought an A7CR and housing, which I was quite happy with. I wanted a 2nd camera so I bought the A7RV, and then thought I might as well get a 2nd housing for it. But for me, weight is really important, and I found myself nearly always choosing the A7CR rig, which is 1.1 kg lighter than the A7RV rig. So although the A7RV + housing are demonstrably better designed / have more features, the fact is I don’t notice any appreciable shooting difference underwater. So while I don’t have to sell the A7RV housing, I don’t need it either. Prices: at the time of placing this ad, Backscatter and Nauticam websites list the housing at USD 4800, flash trigger USD 330, vac valve USD 240; total USD 5370. I am asking AUD 5000 total, which is USD 3300 at 0.66. Other items which will be for sale if anyone is interested: my A7RV body (VGC with low shutter count) – I would keep it but it makes more sense to buy a 2nd A7CR body; Nauticam N120 8.5” dome in good condition.

Admin dudes: any chance of pinning this topic? I'm finding it super useful. I haven't printed anything for over 10 years and have forgotten whatever I learnt about colour management. And my spider is sure to be useless now. But I'm feeling a renewed printing urge coming on! While we are at it, could the printing gurus suggest a user-friendly Mac compatible spider, which works with all types of displays, please? Might as well get some thoughts on underwater photo-friendly displays too! Say, mid-range prices? Many thanks in advance...!

Doubles the focal length of the attached lens with a 2 stop light loss. Operability is retained. Compatible with a range of full frame and APS-C lenses. Weight: 207g. Includes original paperwork, box, caps and pouch as shown. Price: AUD 525 ono.