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Forum: Pentax SLR Lens Discussion 03-09-2019, 10:52 AM  
Sigma 8-16 for star photography?
Posted By interested_observer
Replies: 3
Views: 536
No, nothing is ever a complete loss. What you are doing, is essentially trading Field of View width, for aperture (collecting light). There are a number of things that you can do to recover. Bottom line is that with astro, collecting light is paramount, because there is so precious little of it from the stars (with no moon).

Take a look at this website Using - crop: 1.5, megapixel: 16, focal length: 8, pixel tolerance: 4 you can get 20seconds of exposure. Just lock the mirror up and using an external shutter release, just lock-it in continuous and take a number of images back to back. Then use Sequator (free download) to stack them.

You can also use the O-GPS1 startracer and get up to about 60 seconds of exposure. You can also stack those images too.

There are ways around the limitations. You will just essentially get dimmer stars, and these are ways to gather additional light to make them brighter.

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