Canon 200D / Irix Firefly 15mm F/2.4 - elongated stars

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Canon 200D / Irix Firefly 15mm F/2.4 - elongated stars

Postby brenski » Thu Sep 09, 2021 1:34 pm

I'm really hoping someone can help with this one.

A little bit of background: Initially, I thought the issue was build quality of Samyang 14mm lens. However, I've now purchased a better lens and been to a dark sky site to take his latest batch of Milky Way images.

Equipment: Canon 200d, Irix Firefly 15mm F/2.4 lens, tripod, shutter release cable.
Settings tried: ISO 800-3200, shutter 20-25secs, aperture F/2.4-and various stops down.

Image 1: = sh F/2.5, 20.3sec, ISO3200
Issue: Stars are dashes (even in centre of image). This was the same issue with the Samyang (previously). I'm now struggling with why the Irix is producing the same results. Could it be the Canon 200d has a problem?

Note: I've also tried OFF/ON settings for each of the following (in different combinations):
Lens Aberration
High ISO NR
Mirror Lock

Results do not change.

Image2: = shortest length exposure taken: F/2.5, 12.5sec, ISO6400

Do you think it's any better?

Much of what I've read suggests 30secs untracked for Milky way shots, but that's clearly not possible. So, how with <15secs do I capture enough to be able to get decent Milky Way detail?

What about processing? What will bring out the best of an image?

Does anyone, have any ideas that may help me resolve this?

thanks

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Re: Canon 200D / Irix Firefly 15mm F/2.4 - elongated stars

Postby galileo » Mon Sep 13, 2021 7:05 pm

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Re: Canon 200D / Irix Firefly 15mm F/2.4 - elongated stars

Postby brenski » Mon Sep 13, 2021 7:20 pm

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Re: Canon 200D / Irix Firefly 15mm F/2.4 - elongated stars

Postby galileo » Tue Sep 14, 2021 7:14 am

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