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12-21-2016, 09:41 AM   #1
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worth tracking down a Sigma 8-16 or 10-20 for wide perspective sky/night sky?

still at the considering/thinking stage with this one (LBA can be nasty)

worth tracking down a Sigma 8-16 or 10-20 for wide perspective sky/night sky?

would plan to use with K-3ii astrotracer

the 8-16 seems hard to find second hand here in the UK. New full price it is available, but it is ~ 500 .

12-21-2016, 09:49 AM   #2
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QuoteOriginally posted by Conqueror Quote
the 8-16 seems hard to find second hand here in the UK. New full price it is available, but it is ~ 500 .
The 8-16 is hard to find second hand in K-mount everywhere...

I bought the 10-20/3.5 used from B&H. It was $378 vs $480 new...

I'm sure someone will come along to tell you to consider the Samyang 14/2.8 or 16/2 instead.
12-21-2016, 10:04 AM   #3
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Yeah 8-16 does seem in short supply second hand

Decided looking for wider than 15, normally a primes person, but I suspect zoom will be quite useful at this end

Last edited by Conqueror; 12-21-2016 at 10:04 AM. Reason: typo
12-21-2016, 10:10 AM   #4
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One major issue is that astrotracer does not work very well with UWA lenses -- the stars don't more across a UWA image in a way that astrotracer can remove. You'll get strange residual star trails in the corners. (The exception is if you point the camera directly at the celestial north pole or south pole in which case astrotracer will successfully remove the rotation.)

If you have LBA + the astrophotography bug, you'll want to get a motorized tracking mount.

12-21-2016, 10:19 AM   #5
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i'm not sure but was thinking rgknief60 has an 8-16 if he still has it...you might try catching up with him...roger sorry if i am wrong
12-21-2016, 10:58 AM   #6
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The distortion might mess with you on UWA, but with UWA you can still get good exposures from single shots.
12-21-2016, 02:06 PM   #7
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Try the 8mm fisheye from rokinon/samyang. Won't find a wider perspective, and it's easier to remove the distortion than a rectilinear would be.
12-27-2016, 09:16 AM   #8
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I had good luck shooting a Tamron 10-24. I found that 10-mm was generally more than wide enough. I suspect I would have made the 15 mm work, but the advantage of 10mm was that I could crop away the corners as I needed. Wider angles make it easier to shoot longer without star trails. I don't have the astro-tracer, so I haven't tried it, but wider angle makes focus stacking somewhat easier with fewer shots needed (due to ability to shoot longer duration), and that type of software works pretty well with more stars in the sky.

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