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Hi all,

I'm in the market for a Sony A7, but am having trouble deciding on which to use based on my application. My primary hobby is my saltwater reef tank, so that will be the primary subject of the camera but I'd still like to bring it with me on trips and take pictures of my other animals and such. I'm intending to get the macro FE 90mm f/2.8-22 lens down the line too. My main question is, is there a huge difference between the II, III, & IV for my purposes? I've read the III is much better than the II, but I've also read the same about the III to IV. I'm sort of between buying a II body and the Macro lens, or just getting a III or IV with an included lens. I know the III has much better video, which would be nice to have too. Any input is greatly appreciated!

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Each succeeding generation of A7 would bring more features, more improvements and higher prices.  Check this link and decide for yourself (you can make comparisons with more recent bodies as well):  https://cameradecision.com/compare/Sony-Alpha-A7-III-vs-Sony-Alpha-A7-II

On the used market locally (Vancouver BC, Canada) A7II is selling for about $800, A7III for $1700 and A7IV at $2200 in Canadian funds and in good shape.  Personally I can dream about acquiring an A7III but considering my current financial situation, my A7II will probably be my last A7xx camera.

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I just picked up an a7r. The issue I'm learning with mk.1 bodies is that finding an inexpensive teleZoom with AF+OS is tough. A- mount lenses very seldom have os, and FE Sonys don't come cheaply. Looks like a vc Tamron in canon mount + 7art ef-fe adapter is the lowest cost. For now I'm ok with maxxum 70-200 or 100-300apo and manual adapter with vague aperture dial.

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  • Posts

    • I don't think any camera guide mentions it, most manufacturers remain mute. It is discussed regularly and typically pointed out during new camera reviews. If Sony were trying to keep it a secret, they wouldn't let their shills say anything. There's no chance of keeping anything like this quiet these days, someone is going to spill the beans. I suspect they, like other manufacturers, don't discuss it in print for some technical reason. I have discussed it with Sony reps at local camera events on several occasions, it's no secret. In fact, they like to tell you about the advantages in practical application.  One thing I noticed in the chart above. The DR chart shows a smaller gain at ISO 400 than the read noise chart. This one is more accurate for noise, and you can see that ISO 400 is actually similar to ISO 126. That's a huge advantage. If you check this chart for your A7 RV you'll see that ISO 320 gets you down to between 126 and 159, seems plenty usable to me. 

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      And a different look. The shadow improvement charts show where the shadows are improved for DR, and how much. In the A7 IV there's about a 2-1/2 stop improvement at ISO 400, and then no additional improvement at all until you get to ISO 56K, where Sony applies in-camera NR. According to the primer on this chart, there is no degradation of noise along these flat lines, like from 400 to 51K. Not sure I can agree with that, but I can certainly recover image into ISO 50K in testing and shoot ISO 16-20K successfully.         
    • It is 320 for stills on my A7R5 so it’s 5/3 stops. I have used it on occasions but it’s a bit low to be any huge deal. It is much more use in video where it is 2500. Have a search for any of those terms you mentioned above in any current Sony camera online guide & I doubt you will find anything. I was at an event yesterday where there were two Sony reps & they wouldn’t discuss it even though one of the presenters mentioned it when talking about his A7S3.
    • Yes, I would always wait a week before installing just to see if anyone has problems. This is good advice for any software updates to be honest.
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