Chris Ross

The Canon 60mm macro is an APS-C lens and using it on an APS-C system should be decent and gives you 90mm focal length which is +/- a standard macro lens for an APS-C system, while the 90 mm is 135mm equivalent and in my mind a bit long for an APS-C system unless you are shooting mostly very small things. I don't recall but I'm guessing you shoot APS-C Sony? Assuming APS-C Sony, to make it more difficult to work out what to do, I expect you could use the MFO3 on the 60mm lens as well, I know it certainly works well with my 60mm olympus macro lens and gives you a decently wide view which would be better if you are shooting weedy sea dragon (400mm long ) size critters if you expect to encounter critters in this size range. You would of course need to check it will work - Nauticam have remove dthe EF-s 60mm from their port chart, but the Nikon 60mm macro is listed on the that chart as working with the MFO3 so I expect it probably should work as long as the flat port fits well. You could check for vignetting on land. It might also work with the Zeiss 50mm macro which has a few fans on this site as I recall, but again you'd need to check for vignetting. Having said all that the big attraction for me is carrying a wider view with you when shooting macro.

Parasitic copepod of the family Pennellidae, Cardiodectes sp., possibly Cardiodectes bertrandi. I got the ID from a Facebook group called ID please (Marine creature identification) on a photo of mine I posted there, which is pretty good at getting IDs

If you can't get fresh water, use salt water, what you are trying to avoid is the water drying on the housing. Leave a little water in to carry off and back to your accommodation and give it a proper rinse there. I think the water gets pretty salty in some of the onboard rinse tanks I've seen on dive boats.

which is even worse, 300 dpi on the web means absolutely nothing, pixel dimensions is all that is required.

Do you actually need to full frame would be my first question, depending on what lenses you want to use it can be significantly more $ and also heavier and bulkier making travel more difficult. Rectilinear wides, depending on which particular model work best in large 230mm domes, some of the new ones are OK in the 180mm domes. In ikelite you have basically an 8"dome and a 6"dome which works with some systems only and some have caveats in use. If you went m43 your lenses are significantly smaller and cheaper and in general work quite well with smaller domes. For me a big attraction is using the Canon 8-15 adapted to get full fisheye through to a 28mm FF equivalent reach. You can do something similar with an 8-15 on an APS-C sensor , but reach is a little less - very versatile setup for wide angle work.

Seems like if you get the boosters with the strobe there is a deal, $100 more gets you the boosters and two four cell battery chargers. I don't have the Pro max, just the lower power pure model, my current usage is the standard 4 cell configuration for local diving - go out for a single long dive locally and use the boosters when I'm on a trip. Cheaper than buying them later on.

Hi and welcome aboard, hope you enjoy the forums!

if they are asking for 300 dpi images they don't actually know what they want, they need to supply you with finished size, 300 dpi by itself is meaningless . 3840 x 1920 image is 32 x 16cm at 300 dpi. if you just type in 300 dpi on your 72 dpi image with resample selected it will make a 16000 x 8000 image which will look pretty average. If you send me the image I'll email it back in a few hours

What didn't they like about it? just the pixel dimensions or other issues. If a little soft you'll only magnify that if upscaling. The other thought is have set black and white points and pumped up the contrast a little, that always helps give the impression of sharpness. Assume you've gone through and picked your best frame and assuming that looks OK, bring it into PS and upscale it to 7680 x 3840 apply a little sharpening then re-size to the pixel dimensions they want. A good pic printed properly should look pretty decent at only 150 dpi. What finished dimensions do they want? Happy to give it a go with the standard PS tools, not sure how big the file will be but a jpg should email OK.

What are the pixel dimension changes, was it 4K footage to start with? Depending on how big the poster is, a good 4K frame should look halfway decent at that resolution.

You could probably forget about macro lenses then, a 24-70 or 24-105 in a small dome sounds about right??, anything shorter focal length the performance is probably compromised in a small dome. The 180mm Nauticam or 170mm Zen is a known quantity in the port charts, the 140mm should work but you may or may not be happy with it at 24mm, which you might want if the fish let you get close. I suspect the scoot to the general vicinity and stow the the DPV might be the productive option?

I think you originally mentioned photographing fish, I would think perhaps that might be the starting point - are they big fish or small fish? what sort of focal length do you need? If they are smaller a short macro lens might work, though Canon doesn't have one for full frame. If they are bigger perhaps a 24-105 behind an 180mm dome or the Zen 170mm dome but that's only marginally smaller than an 8"dome. A macro lens would the most streamlined option of course with a flat port. Would a 60mm equivalent macro work? you could do that with a 100mm macro and MFO3. You could also try a 24-105 behind a 140mm dome. The 24-105 is on the port chart with the 180mm dome, but not the 170mm or 140mm. The 140mm and 230mm domes use the same extension. The lens extends a long way at max zoom so may hit the dome glass in smaller domes. With the 140mm dome the corners might be pretty bad between 24 and 30 to 35mm zoom. If photographing fish my main concern would be that if you need to fluff around to remove the camera from the scooter and then stow the scooter the fish might disappear in the mean time so shooting with camera on scooter might be the best option unless you travel to an area detach and search for targets without the scooter.

Be interesting to see some comparison images especially with the RF 2x.

welcome aboard Drew, good to have you here.

Dave noted above that ABS is a stronger material and also the fact that printer settings can be an issue. You could try contacting forum member gudge who replied above to print you one. He printed mine and it seems pretty sturdy. He's based in Australia so you would be dealing with shipping etc. but should get a good gear out of it.