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Some things to consider:

 - There have been no rumours about a new 70-200 f/4 yet.

 - Have you considered the Tamron 70-180 f/2.8? It's about as light as the Sony f/4 and just as expensive. It is a stop faster, sharper and has better macro magnification, and much smaller during transport. Cons: no OSS, marginally smaller zoom range and external zoom.

 - The 70-200 f/4 is designed in such a way that it breaks in half when subjected to impact loads. There's a lot of debate about this design because the repair costs of a broken lens are about 40% of a new lens, yet had this design not been implemented the lens might have been totally busted. But given the amount of reported cases of snapped lenses, the breakpoint may be designed too weak.

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Edited by Pieter
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    • Make sure camera and lens is updated to latest firmware. 
    • ISO 320 is the A7R5's second base ISO setting. You will find at ISO 320 you will get better results than even ISO 200. I normally take a set of shots at 1600, 3200 and 6400 ISO. I am taking 60 light frames and 10 dark frames. I don't do any adjustments to the files before stacking. I really need to get organised and do some bias frames now. Here is pretty much my first successful Milky Way shot from a few months ago. I was combatting a bit of ambient light and quite a lot of cloud but I'm pretty happy with this. It was shot using my Sigma 16-28 f2.8 which is better at astro than I had anticipated, at ISO 1600.

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    • Thanks for the information. Since my original post, I did some "experiments" at different iso settings. Best results were obtained at iso 320, and then increasing the exposure by four stops in Lightroom. The biggest difference compared to using a higher iso was that there was detail in dark foreground areas, while at high iso the dark areas were blocked. This is consistent with articles I've read about ISO invariance.
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