1 hour ago, nuraman00 said:
The second one is meant for land usage; it might survive immersion in salt water, or it might not - if it has any metal parts without protective coatings, they will rust. Regardless, the Salted Line housing does not have rails for attaching an LCD magnifier, it only has four little pegs for attaching the bundled hood, and there's the cylindrical viewfinder in the upper left corner that intrudes a bit into the LCD. The way you attach a magnifier to it is make a few cuts in its hood and sew it onto the bundled hood, so that it functions as the intermediate interface - see the Scubaboard post I linked earlier. The D&D universal magnifier uses cords to attach to the housing; they go around the front and might hold it securely enough without any DIY action.
1 hour ago, nuraman00 said:
For White Balance, should I try the "Underwater Auto" setting? I just tried some test shots right now inside a large room. I didn't see a difference between regular Auto and Underwater Auto. I realize I'm not underwater right now, I just wanted to see if I could see a difference in some test shots.
For photos, just shoot RAW and adjust the white balance in post.
1 hour ago, nuraman00 said:
Also, while snorkeling, is it that easy to shoot upwards? Since there's only a little bit of distance one can go, while the air tube can still reach the surface.
If you're staying on the surface, then no, it's not really possible. If you want to shoot quality pictures without going full SCUBA, then you need to learn breath-hold freediving.
1 hour ago, nuraman00 said:
The a6100 appears to have an electronic viewfinder:
I'm referring to electronic level, not viewfinder - https://www.sony.co.uk/electronics/support/articles/00014661
1 hour ago, nuraman00 said:
Do you think that the 16-50mm lens I have is good in general? Just not always great for larger subjects?
So you think the Sony E 10-18mm lens would have been better for larger subjects? And that would have helped me get closer?
I don't know what I'm going to find at each spot, so I would start with the 16-50mm. Then get back on the boat, change to the wide lens, then try again. But there's also not much time sometimes to do all of this. Probably 30-45 minutes per snorkel spot. Swimming back to the boat, drying off, changing lens, then going back out might take too much time. I think your suggestions for another lens are good, but I think want to try things I can do while I'm already in the water, like getting closer, adjusting my shooting angle, and adjusting some manual settings.
16-50mm is a good lens, just not always wide enough when you get close to a subject. Consider adding a wet lens such as AOI/Fantasea UWL-09 - you can attach and detach it underwater, to suit the shot, although if you do that you will also need a way to carry it while detached. If you use the 10-18mm, then you will also need a dome port - using it underwater with a flat port produces extreme levels of distortion.
1 hour ago, nuraman00 said:
Also do I need to shoot in RAW for post processing, or can I also do them with JPEGs?
RAW format records the raw data from the camera's sensor - basically, the read-out charge level of each individual photosite, whereas recording in JPEG has the camera's processor take that raw data and create an image from it. In this process, some of the data is discarded. Shooting RAW and processing it manually allows you to define your own settings for processing the image, and is highly useful when shooting underwater, especially in natural light. If you try to post-process JPEGs, the results won't be as good.