On 6/25/2023 2:45 AM, Larry Colen wrote:
On Jun 25, 2023, at 12:27 AM, Bill <[email protected]> wrote:
Continuing with my rather scattershot approach to learning dark sky
photography...
This was shot with the K1 and A15/3.5 using the Astrotracer.
f4.5, 39 seconds @ ISO 3200
Comments and hints about how to do this stuff are welcome.
How did you get 39 seconds with astrotracer? I thought it did increments of 10
seconds.
I inadvertently pushed the green button and lost in body timing and
forgot how to get it back. So I was counting elephants.
First of all, one of the challenges of astrotracer is that if the geometry of
the image isn’t uniform, then you’ll get motion bluring in some parts of the
image, like you seem to have gotten in the corners.
The A15/3.5 isn't the best lens for this stuff. It vignettes, it has
coma, and the motion blur with wides seems to be a weakness of the
Astrotracer.
It’s hard to tell on my screen, but it seems that you may not have quite nailed
focus. What I tend to do is to find something bright at infinity, like jupiter,
zoom in on live view manually focus, then ideally tape the focus ring down with
blue tape.
I was having a bugger of a time focusing. I couldn't see anything
through the viewfinder, and the rear screen was useless because of
noise. I was trying to focus on a farm light on the horizon, but even
that wasn't working well.
You’ve got the weird color going on in the sky, I think that’s pollution
showing up close to the horizon.
There was a bit of pollution, but I was having some fun with a selective
colour mask.
Thanks for looking.
bill
https://flic.kr/p/2oKr3QE
enjoy
bill
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