Photographing Neowise with 600mm lens

Started 3 months ago | Questions thread
PHXAZCRAIG Forum Pro • Posts: 16,761
Re: Photographing Neowise with 600mm lens

I've been shooting 500mm and 700mm the last three nights.

Total newbie at this astro stuff.   I have a new 500F5.6 prime, and an old 1.4TC, so I've been trying that from my porch.

With the 1.4 mounted, I have an actual 700mm, of FX format (D850).

What I've found is that if I go above about ISO 8000 I don't like the look of the noise I get, and particularly above 10,000.  But I've got a slow lens to deal with - F8 wide open.  The viewfinder is dark enough to make it extremely hard to find the comet in the viewfinder.

With ISO 8000 or so, I'm using 2, 3, and 4 second exposures, but I'm certainly getting star trails.   Really, at 700mm I need to be shooting at 1 second or less, and at F8 I'm into very high ISO I don't like.   Not sure I have much I can do here, besides stacking techniques I'm not prepared to do.

As for the focal length, it's been fine.  I get all the tail I can make out of the background glow of the Phoenix city lights.

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Phoenix Arizona Craig
"In theory, practice and theory are the same. In practice, they're not."

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