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Wouldn't it be necessary to focus all the lenses to infinity to compare them, because if you focus the lens close there will be a slight change of the focal length which effects the lenses ...

I could sell or lend you my techart ef to gfx adapter but i live in Austria/EU and shipping is quite expensivE. Regards

Keith Cooper is a pro fotographer and will come up with some useful findings which i am looking forward to. M2C.

Maybe you used ES which can not do longer than 0.5 sec ?

Which shutter did you use M, EFC or ES?

Agreed, but still it could be the higher powerconsumption of the evf when the battery is low and worn, but this is guesswork from my side. In my case it did help to replace the battery but who ...

I can not talk for the OP but of course the first thought was a dirty eye sensor and i did clean it with no avail. Regards

Well, even if you use the battery grip it could be a bad battery because as far as i know the camera uses one battery after the other and it is possible that the camera does not detect the level ...

Congrats, i hope  that it will meet your expectations! Regards

Does it show this behavior when the battery is charged fully. My A7RM4 did produce a black EVF from time to time with a old battery . EVF draws more current than LCD but a good battery should of ...

Yes, you are right, and also if you have fast moving objects in the frame with long exposure times ( because of base iso) it would be better to use autoiso.....so it depends.....lots of variables ...

I  never ran in to problems shooting timelapses starting in very dark conditions until bright daylight without autoiso ( using sony, fuji and nikon cameras) The first shots often  had exposure ...

Congratulation, i'm shure you won't regret it because it is a top notch camera which is a huge step up from the very nice A7RM4. regards

Should work without using autoiso changes of brightness are being compensated by exposure time.

Go for the A1. AF is so much better. I use the A7R4 and Alpha1 and  the AF of the A7R4 is not good at all when there is a moving subject involved. For perched birds and landscape the R4 is ok but ...

Sony G 200-600 and Sony GM100-400

This can happen if i shoot a landing plane and want to take a shot every half second so not really very fast and that is when this camera struggles a lot. Yes i will try bursts in the future,  but ...

Yes indeed, it does.

Using single shot, AF-C and priority for focus the camera although showing to have reached focus by a green square does not fire and very often i have to shut down the camera to continue shooting ...

http://www.steelsring.com/wp-content/uploads/2019/12/IMG_20191229_110338.jpg Regards