jtra wrote:
Or I could use mechanical shutter (and even increase ISO to 400 for comparable DR) but risk shaking the lens. There are no do-overs in Moon alignment photography.
I have tested a7rv internal intervalometer with mechanical shutter (it can be set in intervalometer menu, but it defaults to electronic) on my two tripods. The travel tripod Gitzo GK100T (similar to GT1545+GH1382TQD) and heavy Gitzo GT4543LS+Markins Q20i. The travel tripod was without center column extended the heavy tripod was set to same height as travel. With 1/5s exposure and 1s interval a lot of pictures in sequence showed it was shaky at 800mm on 400-800mm (OSS off) on the travel tripod, but it was good on the heavy one. The electronic shutter was good on both. So it can work for timelapse in mechanical as long as heavy tripod is used.
jtra wrote:
I have tested a7rv internal intervalometer with mechanical shutter (it can be set in intervalometer menu, but it defaults to electronic) on my two tripods. The travel tripod Gitzo GK100T (similar to GT1545+GH1382TQD) and heavy Gitzo GT4543LS+Markins Q20i. The travel tripod was without center column extended the heavy tripod was set to same height as travel. With 1/5s exposure and 1s interval a lot of pictures in sequence showed it was shaky at 800mm on 400-800mm (OSS off) on the travel tripod, but it was good on the heavy one. The electronic shutter was good on both. So it can work for timelapse in mechanical as long as heavy tripod is used....Show more →
I assume you had EFCS enabled for the mechanical shutter shots?
You might want to test the slowest one, but Sony bodies are not capable of CFe 4.0 (one lane of PCI 4.0) speeds so over 900MB/sec. probably is no practical difference. They revert to CFe 2.0 speeds (one lane of PCI 3.0) instead. Theoretically a CFe 4.0 camera could provide a larger continuous burst and faster buffer clearance if the whole pipeline could keep up.
Note that those silver cards are VPG 200, so are not truly as sustained as the Gold Type A VPG 400 cards.
jtra wrote:
I have tested a7rv internal intervalometer with mechanical shutter (it can be set in intervalometer menu, but it defaults to electronic) on my two tripods. The travel tripod Gitzo GK100T (similar to GT1545+GH1382TQD) and heavy Gitzo GT4543LS+Markins Q20i. The travel tripod was without center column extended the heavy tripod was set to same height as travel. With 1/5s exposure and 1s interval a lot of pictures in sequence showed it was shaky at 800mm on 400-800mm (OSS off) on the travel tripod, but it was good on the heavy one. The electronic shutter was good on both. So it can work for timelapse in mechanical as long as heavy tripod is used....Show more →
Tests are definitely appreciated, but it takes more than a second between shots for the tripod to settle back down. I’m not saying it will change anything, but it could.
My first outing with the A7RVI. All shots were shot at lossy compressed with the Sony FE 400-800. I bought the A7RVI to compliment my A1. I was very impressed with the bird eye AF on the A7RVI and its tracking ability. They both exceeded my expectations.
