Isaac Szabo

You might be able to use the Canon version of the 10-17mm on a Canon EF to Nikon Z adapter, though I have no idea how well those adapters work.

Can I ask where you found 43mm for Marelux? And what camera system that is for? I'm trying to confirm the distance for Marelux Sony full frame mirrorless. One person measured their housing for me and came up with 39.1mm. It would be great if anyone here can confirm that.

I've been using a monitor for all my shooting for around 4 years, and I really like it. I love being able to see the image no matter what weird position/angle I have my housing. A common example for me is being able to get really low perspectives without having to press my face down next to the substrate. However, a monitor won't be for everyone as there are some significant downsides: increased size/weight of the system - I made my own monitor housing and kept it fairly small, but many commercial models are surprisingly big/heavy increased complexity of the system - more things to setup/maintain and more things that can potentially go wrong reduced visibility in bright sunlight - my monitor isn't super bright, so visibility can be affected by bright/direct sunlight. I think many newer monitors are brighter and may not suffer from this as much. increased cost of the system - most underwater monitor housings aren't cheap With the EMWL some of the size/weight/cost downsides of a monitor are offset by not having to use the middle relay lens, so I think a monitor is a particularly good option for EMWL users.

OK good. Yeah the 100 objective isn't super wide to begin with, so it makes complete sense that you wouldn't want to lose any FOV.

Hopefully you find someone to swap with you. In the meantime, I'll mention that I believe your focus unit will work with your D850, it just will be slightly less wide than if you were to use focus unit 1. So if you want you could likely get some use out of it while you wait for a potential swap.

I believe the M67 thread pitch is 0.75mm.

In my testing I also found that the relay lens reduced image quality a little, so I too went with a monitor instead. To me it makes perfect sense that adding in a lens with 14 additional elements whose only purpose is to invert the image can only have a negative impact on image quality. Nothing in optics is perfect, and I think there are bound to be slight errors that accumulate with so many elements. I have not tried the angled relay, but I am not at all surprised if it degrades the image a little more than the straight relay. After all, it is manipulating the image to an even larger extent, and again, not in an effort to improve image quality. So I personally trust your results. If you do more testing, I would recommend starting at f/8 instead of f/16. Peak sharpness in my testing was around f/8-f/11, and by f/16 I noticed a significant reduction in the sharpness of fine details due to diffraction. So image quality comparisons done in the f/8-f/11 range will likely give clearer results than those done at f/16 and above. That said, obviously for real world shots you may sometimes value the extra depth of field over peak sharpness.

Me too! Hopefully it delivers on the claim.

Image quality is claimed to be far better than shooting through a flat port. It's clear from Edward's post that this is the main reason for this lens. A secondary benefit for some is reducing working distance by shifting the focus range a little closer which helps in poor visibility (so you're shooting through less water). This is a common issue where I shoot but isn't a factor in locations with great visibility. I don't shoot blackwater, but I gather this might help with that too. There is a slight increase in max magnification, but it's not very significant and probably won't be a main reason people buy this lens. There are stronger diotpers available for that purpose. I'm guessing this lens is probably not going to interest people who are already happy with the sharpness of their macro setups, shoot in really clear water, and/or want really high magnification.

Thanks for the info @Edward Lai! It sounds like just the thing I (and others) have been wanting. Do you know if it will also work with 60mm macros on full frame?

What primarily interests me is improving the image quality without losing focus range (though being able to focus closer is nice too). A 60mm on full frame behind a flat port loses quite a bit of sharpness towards the edges. I notice the same thing with the Sony 90mm though to a slightly lesser degree. Does the SubSea +5 improve image quality or just allow you to focus closer? And does it also maintain focus range out to a meter or so?

Wow that does sound fantastic!

Yeah Chip that's how I interpreted it too - with the important addition of improving image quality. I've long been bothered by the sharpness loss towards the edges with macros behind flat ports. Some diopters improve that, but then I lose the ability to focus on many of my normal macro subjects. So if this does what I think it does, it will be a welcome addition for me.

As a point of clarification, it is the camera that is making the auto adjustments to the liveview image. The monitor just displays the signal that the camera sends it. I don't think there's any way to output the auto liveview settings to your shooting settings, other than maybe setting the camera to a fully automatic mode. Short of that, you could temporarily turn exposure simulation back on which might help you dial in your settings more quickly than reviewing test shots. You can likely assign it to a custom button or menu so that you can quickly turn it on or off. As for your second question, my guess is that an HDMI cable or connector could be slightly loose or damaged. If you use a monitor long enough, it tends to happen eventually. While it could be any part of the HDMI pipeline, the ribbon cable and connectors are the most fragile. I have learned from experience to travel with spares for those. It might be a good idea to ask Kraken if they have seen this issue and know what might be causing it.

In the live view shooting settings, try setting exposure simulation to disable.