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Gudge last won the day on March 19

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About Gudge

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    Tiger Shark
  • Birthday 12/24/1954

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    Baldivis, WA Australia

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  • Camera Model & Brand
    Sony A7RIV
  • Camera Housing
    Nauticam NA-A7RIV
  • Strobe/Lighting Model & Brand
    2 x Retra Flash
  • Accessories
    Retra LSD

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  1. For my Sony A7RIV in Nauticam housing I use: Mostly a Nauticam 140mm dome port with removable shade; and Occasionally a Subal 200mm dome with a Nauticam/Subal mount converter
  2. Wolfgang sent me a PM and asked me to comment on my experience with the AF performance of the Sony A7RIV and Sony 90 macro and the Canon 100 macro on Canon dSLR. I was a long term Canon dSLR user (20D, 40D, 50D, 7D, 7DMkII and 5DMkIII) all with the Canon EF 100mm f/2.8 USM Macro. Just over a year ago I changed to Sony A7RIV. Initially I used the Canon 100 macro on the Sony with a Metabones adapter but changed to the Sony 90 macro after 3 months. My wife still uses my 7DMkII with the Canon 100 macro so I was able to compare all combinations of camera/macro lens possible just now. Room was dimly lit. Results varied based on what focus point setup I used on each camera/lens. With all focus points in play and cameras set to AI Servo (Canon) AF-C (Sony) the winner in grabbing focus quickly was the 7DMkII/Canon 100 macro with the A7RIV/Sony 90 macro a very close second (it was occasionally faster than the Canon). The A7RIV/Metabones/Canon 100 macro was a distant third (Which is why I got the 90 macro 12 months ago when I did the same test). When I changed to my preferred mode of shooting with each camera - AI Servo with Expand AF (Canon) and AF-C and Tracking Flexible Spot (Sony) - things changed. The A7RIV/Sony 90 macro was first grabbing focus fastest and holding it better than the 7DMkII which came a close second. The A7RIV/Metabones/Canon 100 macro came third. Points to consider: Before I switched to Sony the 7DMkII was by far the best low light focussing camera I had ever used. Depending on how you set up the autofocus system the A7RIV is better than the 7DMkII with their respective native macro lenses The effect of the Metabones adapter on focus performance will differ from lens to lens. While the Canon 100 macro is slower on the Metabones adapter my Canon 8-15 fisheye (for which there is no Sony equivalent) focusses much faster with the Metabones adapter on the A7RIV than it did on the 7DMkII.
  3. I use Mothers California Gold Water Spot Remover For Glass, it works really well. Has a combination of mild abrasives and mineral dissolving chemicals.
  4. The various adapters are just spacers that hold the lens the distance from the sensor that it was designed to operate at. Canon EF lenses are designed to operate on Canon dSLR's with a certain lens/sensor distance. Putting a Canon EF lens on a Sony mirrorless camera with a spacer holding it the same distance from the sensor will result in no loss of image quality from the lens. If I wanted to use my Canon 8-15 on one of the Canon R series mirrorless cameras I would still have to use an adapter such as the Canon Mount Adapter EF-EOS R. A cheaper option for a FF fisheye on Sony mirrorless cameras is the Sigma 15mm fisheye with Canon mount on a Sigma MC11 adapter. Works out cheaper than a Canon 8-15 fisheye alone. I have a friend who has just started using this combination on a Sony a7RIII.
  5. News to me, I must be doing something wrong! I've been using a Sony a7RIV for just over a year now. I use Canon 8-15 fisheye on a Metabones converter (and occasionally with Sony 1.4X teleconverter as well). Autofocus works fine (better than when I used the same lens on a Canon 7D Mkii). Never even contemplated having to use manual focus. I also use the Sony 90 macro, no hunting whatsoever and sharp as a tack.
  6. My experience with the Canon 8-15 behind a Zen 100mm/4 inch dome is that on a crop sensor camera the results were excellent. When I switched to a full frame camera the results were nowhere near as good. I switched to a Naurticam 140mm/5.5 inch dome and got excellent results again.
  7. I've used a Zen 4" mini dome for many years with the Tokina 10-17 and Canon 8-15 on a variety of Canon crop sensor cameras and have always been more than happy with the results. Earlier this year I got a Sony A7RIV and have been using it with the Canon 8-15 behind both an 8" Subal dome port and the Zen 4" mini dome. I'm more than happy with the results with the 8" dome. However, the 4" dome is not producing good results due to soft edges (something that never happened with the crop sensor Canons). I have just ordered a Nauticam 140mm dome port with removable shade to replace the Zen 4" dome.
  8. There are actually two, 18810 and 18811. Basically the same port but 18811 has a removable shade and is more expensive. If your port had been the 18811 version I would have grabbed it.
  9. I believe this comment may be based on my comments on the A7RIV's sync speed in this thread: I've just been playing around with my wife's and my strobes and now the A7RIV is syncing perfectly at 1/250 as I have reported in my latest comment in that thread. I have no idea why, I haven't changed any settings. It was only missing syncing at 1/250 when I first got it with a very small black band I could easily frame/crop around (easy to do when you've got 61MP to play with). This small band has now disappeared when I use the strobes at 1/250 shutter speed. Maybe the shutter has loosened up little with a bit of use and reacts fast enough now to sync at 1/250.
  10. Strange thing has happened! I was just testing my camera with my wife's strobes (Inon S2000) and it synced perfectly at 1/250. I then went and tested it with one of my Retra flashes (old original model) and now it syncs perfectly at 1/250. I think I'll have to take back my comments about the A7RIV's sync speed back.
  11. Not something I've thought about, but noting that I don't recall having issues with the EVF but can recall a couple of times that I have been blinded by the sun while using an optical viewfinder for such shots, I'd say no. I'd like to add that after using film and digital SLRs underwater for 36 years I was one of those guys who would never use an EVF because they couldn't match an optical viewfinder. My main concern was that they weren't good enough to "lock and rock" for macro shooting. The A7RIV's EVF proved me wrong, it performs very nicely for "locking and rocking" specially when used with the focus peaking display while focusing manually (see comment below). Another advantage of the A7RIV when using Sony E mount lenses is that you can switch the lens to manual focus mode via the camera (vs using the switch on the lens) and have focus peaking display in the EVF while focusing manually. This is not possible with my Canon lenses on the Metabones adapter.
  12. I went back and checked my view of the EVF again over a couple of dives and can confirm that I can see all of the viewfinder. I have a very low volume mask that allows me to get my eye close to the 45° viewfinder eyepiece. Maybe, your mask prevents you from getting your eye close enough to the viewfinder eyepiece to see all the view in the viewfinder.
  13. After shooting Canon dSLRs for many years I switched to a Sony A7RIV earlier this year and am very happy with the switch. All my Canon EF and EF-S lenses as well as other brands using these mounts (Tokina and Sigma) work very well on the A7RIV plus metabones adapter with no autofocus issues. In fact, I would say that auto focus with my Canon 60 and 100 macros and Sigma 150 was better with the A7RIV than my old 7D MkII with the same lenses (AF-C with tracking flexible spot rocks for macro, none of my Canons had this). I now have a Sony 90 macro lens and it is better all around lens than the Canon mount macro lenses I have. I will be selling the Canon 60 and 100 macro lens and continue on with the Sony 90, Sigma 150 and Canon 8-15 fisheye. Above water I will continue to use my Canon 70-200 f4 as I am getting excellent results with this lens on the A7RIV with Metabones adapter. As to the reported issued with seeing all the viewfinder in a Nauticam housing using a 45° degree viewfinder I have had no problems at all. I would suggest that the problem is dependent on how close you can get your eye to the 45° viewfinder eyepiece. I have a very low volume mask, perhaps the person who reported the issue uses a higher volume mask and can't get their eye as close to the viewfinder eyepiece as I can. As to the EVF vs optical viewfinder, at first I thought it would be a problem but after a couple of dives I don't really notice the difference anymore. The ability to review a shot immediately after taking it in the viewfinder without having to take you eye away from the viewfinder and move the camera so you can review in the LCD on the back of the camera is a huge advantage.
  14. Have a look at the fine print in your instruction manual. I have a Sony A7RIV which has an advertised maximum sync speed of 1/250 but I experienced the same problem as you when shooting with it underwater. After a closer reading of the manual for my camera it turns out that the sync speed of 1/250 is only possible with dedicated Sony flashes or flashes that use Sony TTL (Godox TT685S TTL Flash for Sony in my case). Other flashes/strobes will only sync up to 1/200. I have no problems with my Godox flash at 1/250 but can only sync at 1/200 with other brand flashes on land and my Nauticam Flash Trigger underwater. Just found this DPReview, it seems that there are similar issues with using non-nikon strobes and the sync speed as I have described for my Sony: https://www.dpreview.com/forums/post/62076439
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