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10-16-2013, 03:06 PM   #1
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Pentax K-5II fast ultrawide lenses?

Hi everyone! I just signed up hoping to get some advice. I recently switched from Canon to Pentax for the better quality, low noise at high ISOs, and lower prices(really helps when you're a broke college kid). My primary photography interests have recently swayed toward landscape astrophotography. I've managed to create some decent images, but I don't think my 18-55 f/3.5 is going to cut it. As most of you know, this type of work requires very wide, fast lenses. So here's my question, do I go ahead and buy the existing Samyang 14mm f/2.8(effectively a 21mm on my K-5II), or should I wait for the Samyang 10mm f/2.8(15mm on crop body) to be released? I believe these are currently my best two options currently for budget starscape lenses. I'd love to hear some feedback!

10-16-2013, 03:12 PM   #2
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You've summarized your options fairly well already The 14mm works nicely on APS-C cameras, question is, how wide do you really need to go?

I did some star shots a few weeks ago with a 35mm F1.4 (on FF), and I liked it. I therefore don't think that a 14mm on APS-C would be restrictive at all.

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10-16-2013, 04:23 PM   #3
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Thanks for the quick reply! I just wanted to go as wide as possible to catch as much of the Milky Way as I can. Maybe I'll just set my sights on the 14mm. If it's not wide enough I could probably just make panoramas. It'd also be a good investment if Pentax actually makes a full-frame
10-16-2013, 05:15 PM   #4
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Thereīs the Sigma 20mm f/1.8 (there was one in the marketplace for 300U$D) Seems pretty good, and 24x36 image circle. Also big and heavy compared to 21/3.2 but itīs almost 2 stops faster (1 stop and 2 thirds actually)

10-16-2013, 05:46 PM   #5
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QuoteOriginally posted by HiI'mPaul Quote
Hi everyone! I just signed up hoping to get some advice. I recently switched from Canon to Pentax for the better quality, low noise at high ISOs, and lower prices(really helps when you're a broke college kid). My primary photography interests have recently swayed toward landscape astrophotography. I've managed to create some decent images, but I don't think my 18-55 f/3.5 is going to cut it. As most of you know, this type of work requires very wide, fast lenses. So here's my question, do I go ahead and buy the existing Samyang 14mm f/2.8(effectively a 21mm on my K-5II), or should I wait for the Samyang 10mm f/2.8(15mm on crop body) to be released? I believe these are currently my best two options currently for budget starscape lenses. I'd love to hear some feedback!
Samyang 14mm is a superb lens. Probably my favorite--if I were to have only one lens, this one would be it (although usually I also have the DA 40mm and a 135mm prime with me). You can find pics taken with it in the Samyang club:
https://www.pentaxforums.com/forums/lens-clubs/137335-samyang-lens-club-27.html

PF reviews of the same lens, here:
Samyang 14mm F2.8 ED AS IF UMC Lens Reviews - Samyang Lenses - Pentax Lens Review Database
10-16-2013, 08:37 PM   #6
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Hmm haven't heard of that Sigma before but I'll definitely consider it. That 1.8 aperture plus the K-5's awesome High-ISO noise performance would probably do wonders on the night sky! Looks like I've narrowed it down to a used Sigma 20mm or the Samyang 14mm. Thanks for the input people!
10-16-2013, 09:46 PM   #7
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I have the Bower 14mm copy of this lens (also sold as Rokinon & Samyang) and very pleased with it. I did a brief write up about it, you can read it here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/238153-bower-14mm-f-2-8-a.html

Some photos can be found here: Zenfolio | Will Edwards | Steilacoom

There is a problem with the distance scale, which I talked about. This lens is becoming one of my favorite lens.
10-16-2013, 10:12 PM   #8
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QuoteOriginally posted by Wingincamera Quote
I have the Bower 14mm copy of this lens (also sold as Rokinon & Samyang) and very pleased with it. I did a brief write up about it, you can read it here:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/238153-bower-14mm-f-2-8-a.html

Some photos can be found here: Zenfolio | Will Edwards | Steilacoom

There is a problem with the distance scale, which I talked about. This lens is becoming one of my favorite lens.
Wow, those are some nice shots! Thanks for the feedback. I'm getting ready to pull the trigger on the Samyang copy listed for $320 on ebay. Think that's a good price? I can't seem to find a lower one..

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