arduluth Offline Upload & Sell: Off
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I don't use a Fuji, but I do use a NEX which requires a similar approach for focusing for astrophotography. I use two techniques:
1. Zoom in as far as you can. Make sure focus peaking is off. I have a developed a good sense of when a shot is slightly front or back focused based on the color change for the main lens I use for astrophotography (Sony 16/2.8 pancake), which helps for this.
2. Do a test exposure. #1 usually works well enough by itself, but there are times when that doesn't work (clouds, etc). Wide open, ISO 6400-12800, for a second or two. If you've got blobby stars, move focus a bit. If the problem gets worse, move it back. Keep going until the center stars are little pinpricks.
IIRC, the Fuji will hold it's MF position when you turn the power off. This may not be true, but this is what I've been told. If it is, just be careful not to move the focus ring - I suppose you could tape it as well.
On the NEX, that isn't true - so instead, I let it put itself to sleep. It holds MF position in that state.
I'm also interested in the Samyang 12/2. It looks like a great lens for night work!
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