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06-19-2016, 10:06 PM   #16
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QuoteOriginally posted by RAART Quote
How is that Sigma 15-30mm you have?
It is very susceptible to flare, physically it is well built with a rear gel filter holder. The lens is also very light, it is bit on the slow side but the focal length is extremely useful on both APS-C and on the K-1. On the K-1 @15mm f/8 image quality is very good, image quality is maintained consistently up to 22mm, at 23~30mm its performance diminishes. At 30mm it is rather soft in the corners, the FA31 can beat it at any aperture.

06-19-2016, 11:49 PM   #17
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QuoteOriginally posted by Digitalis Quote
It is very susceptible to flare, physically it is well built with a rear gel filter holder. The lens is also very light, it is bit on the slow side but the focal length is extremely useful on both APS-C and on the K-1. On the K-1 @15mm f/8 image quality is very good, image quality is maintained consistently up to 22mm, at 23~30mm its performance diminishes. At 30mm it is rather soft in the corners, the FA31 can beat it at any aperture.
Thanks.
06-20-2016, 03:52 AM   #18
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QuoteOriginally posted by Digitalis Quote
With the exception of the Sigma art lens, all of these lenses are designed for full frame.
Not designed for, but useful at FF at the long end, if you can accept some vignetting (shown here). Its a very heavy alternative to the 31/1,8 limited on FF, but also a couple of hundred dollars cheaper and it has a small (usable) zoom range from about 28 to 35 mm depending on how much vignetting you can accept.
06-20-2016, 05:29 AM   #19
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QuoteOriginally posted by Digitalis Quote
To eliminate reflections from glass,foliage and also to deepen the colour of the sky. Better polarizers cost more, and the really good ones transmit more light so your exposure isn't affected as much by them.
I have used CP filter before and found cheap filters do more harm than good. Are you saying you always need a CP with this lens?

06-20-2016, 08:37 AM   #20
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QuoteOriginally posted by Greinerstudio Quote
Are you saying you always need a CP with this lens?
no, not always. but it is good to have one especially for this lens.

QuoteOriginally posted by Simen1 Quote
Not designed for, but useful at FF at the long end
Lets not throw grey areas into this argument. The Sigma 18-35mm f/1.8 ART is a DC lens, designed for APS-C format with the express purpose of filling the 27-52mm focal length range with a fast f/1.8 aperture. Its already limited focal length range gets even more limited on FF - I think it is highly inappropriate to say it is useful, It isn't. It is wasteful of money to buy this for exclusive use on a full format camera, as the user will only be able to use it within a certain limited focal length range, and even if they do switch to APS-C crop mode to reduce vignetting they won't gain anything in FOV from doing so.

Last edited by Digitalis; 06-20-2016 at 08:47 AM.
06-20-2016, 08:54 AM   #21
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I feel the need to stick the 18-35 on my K1 just to see what happens now.
06-20-2016, 09:01 AM   #22
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QuoteOriginally posted by VoiceOfReason Quote
I feel the need to stick the 18-35 on my K1
As long as you don't damage the lens mount...
06-20-2016, 09:15 AM   #23
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QuoteOriginally posted by Digitalis Quote
As long as you don't damage the lens mount...
I'll watch for that, but I haven't had problems with my other Sigma lenses.

06-21-2016, 12:31 PM   #24
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QuoteOriginally posted by VoiceOfReason Quote
I feel the need to stick the 18-35 on my K1 just to see what happens now.
I'd really like to see the results....
06-23-2016, 01:27 PM   #25
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Can someone do some good low light stuff with the 18-35mm?

---------- Post added 06-23-16 at 01:32 PM ----------

Both of these lenses are incredible. Sadly, I rarely use the DA 12-24mm and I need to start using it again.

DA* 16-50mm

Volbeat @ The Paramount
by John Rudolph, on Flickr

DA 12-24mm

Judas Preist - Epitaph Tour
by John Rudolph, on Flickr

Last edited by john5100; 06-23-2016 at 01:36 PM.
06-23-2016, 01:38 PM   #26
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Sigma 18-35 F1.8 low light

I have both 12-24mm and Sigma 18-35F1.8 Art. I love the Sigma, especially in lower light situations. I mostly shoot landscape but frequently in low light conditions.

I go to the 12-24 when I absolutely need the wider angle OR when I'm shooting in to sun or want a sunstar. The 18-35 is basically impossible to shoot in to the sun. It has beautiful sunstars around lesser light sources like street lights, etc. but flares horribly in direct light.
I go to the 18-35 whenever I can!

Here's an example:


(a special boo to the a-hole photographer who set fire to this particular boat so that one can no longer get this shot, glad I got to it when I did)
06-23-2016, 01:45 PM   #27
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tho now discontinued and might be hard to find, have you considered the 16-45 f/4 ? I started a thread on it the other day
, some ppl have found it far cheaper than the 565usd at amazon, https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/324264-no-love-16-45-a.html
06-23-2016, 01:53 PM   #28
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QuoteOriginally posted by carolina_sky Quote
I have both 12-24mm and Sigma 18-35F1.8 Art. I love the Sigma, especially in lower light situations. I mostly shoot landscape but frequently in low light conditions.

I go to the 12-24 when I absolutely need the wider angle OR when I'm shooting in to sun or want a sunstar. The 18-35 is basically impossible to shoot in to the sun. It has beautiful sunstars around lesser light sources like street lights, etc. but flares horribly in direct light.
I go to the 18-35 whenever I can!

Here's an example:


(a special boo to the a-hole photographer who set fire to this particular boat so that one can no longer get this shot, glad I got to it when I did)
Hope they were prosecuted for it.
06-23-2016, 02:00 PM   #29
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QuoteOriginally posted by VoiceOfReason Quote
Hope they were prosecuted for it.
Does not appear so. Here's the story:
Iconic Shipwreck's Fire Likely Caused by Light Painting Photographer
06-23-2016, 02:00 PM   #30
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Wonderful boat photo. Sucks when people do stupid things like burn that boat.

Erikka - Good call on the 16-45mm F4. I've heard some really great things about it.


For our California friends 12-24mm

San Francisco - Fort Point
by John Rudolph, on Flickr

Last edited by john5100; 06-23-2016 at 02:20 PM.
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