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12-31-2016, 01:08 PM   #1
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Is there a high quality compact prime around 17-18mm for K1?

I can see some FF primes but they are not small. In my film days (OM1/OM2/OM4) I had a very compact 17mm... it was not cheap; 250 in 1985, used. It was about the widest lens that preserved straight lines.

I was looking at the 15-30 FA but at over 1kg it is even more massive than my 24-70 f2.8 and since it would be relatively rarely used I am not going to haul a 1kg lens around.

12-31-2016, 01:14 PM   #2
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You could check out the Zenit 16mm, they are quite compact and FF.
12-31-2016, 01:16 PM - 1 Like   #3
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if you are looking at used, there's the Tamron Adaptall-2 151B - all 17mm of it... Tokina did a 17mm also....

but new - you're looking at Samyang, Irix....
12-31-2016, 01:28 PM   #4
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QuoteOriginally posted by bobbotron Quote
You could check out the Zenit 16mm, they are quite compact and FF.
It's a fisheye, no?



12-31-2016, 01:54 PM   #5
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Yeah, iq is quite good, would probably defish well.
12-31-2016, 02:15 PM   #6
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Older wide angle lenses often work poorly on digital because of the low angle with which light hits the sensor edges.
12-31-2016, 02:54 PM   #7
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Samyang don't seem to do anything that's full frame. They do this one
Samyang 16mm F2.0 ED UMC CS Lens - Pentax Fit
12-31-2016, 02:59 PM   #8
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The Samyang 16/2.0 is APS-C, but the 14/2.8 is full frame. They are manual focus, though.

12-31-2016, 03:03 PM   #9
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I picked up a second hand Tokina 17mm RMC . I am quite happy with it. Maybe not top shelf but adequate for landscape and interior photography. I would rate it similar to my Pentax K24/f3.5 in optical quality and size.
12-31-2016, 03:04 PM   #10
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QuoteOriginally posted by peterh337 Quote
Samyang don't seem to do anything that's full frame. They do this one
Samyang 16mm F2.0 ED UMC CS Lens - Pentax Fit
I have Samyang /Rokinon 14mm 2.8 , it is FF with PKA mount, love it!
12-31-2016, 04:03 PM   #11
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14mm is pretty wide... a rather "special purpose" lens. Even landscapes look slightly un-natural at 14mm.
12-31-2016, 09:36 PM   #12
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I don't think anyone makes a new 17-18mm for the K mount.

Samyang/Rokinon/Bower has wider or longer lenses, but they emphasize fast aperture and sharpness rather than compactness. Their 20/1.8 and 14/2.8 weigh in the 0.5 kg range (the 16mm is not FF).
12-31-2016, 09:40 PM - 1 Like   #13
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QuoteOriginally posted by peterh337 Quote
14mm is pretty wide... a rather "special purpose" lens. Even landscapes look slightly un-natural at 14mm.
IMO anything wider than 20mm for FF is extreme. I agree that the Pentax 15-30mm f/2.8 is a bit of a heavyweight and slow as would be expected with 18 elements in 13 groups, the SDM AF motor, plus WR seals. Would LOVE to see an AF FF 20mm f/1.8 prime under 400g. No doubt itʻs on the lens map, so until then itʻs the Rokinon MF 20mm f/1.8 which is nearly 500g.

Are you sure you want 17-18mm for the K1?
12-31-2016, 11:04 PM   #14
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QuoteOriginally posted by Alex645 Quote
IMO anything wider than 20mm for FF is extreme. I agree that the Pentax 15-30mm f/2.8 is a bit of a heavyweight and slow as would be expected with 18 elements in 13 groups, the SDM AF motor, plus WR seals. Would LOVE to see an AF FF 20mm f/1.8 prime under 400g. No doubt itʻs on the lens map, so until then itʻs the Rokinon MF 20mm f/1.8 which is nearly 500g.

Are you sure you want 17-18mm for the K1?
I would second this, it is a very wide field of view.
01-01-2017, 01:08 AM   #15
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QuoteOriginally posted by Alex645 Quote
. Would LOVE to see an AF FF 20mm f/1.8 prime under 400g
Under 400g? HA! If pentax ever makes a 20mm f/1.8 will weigh in the vicinity of 500~700g. Personal;ly I'd prefer it to be heavier, as weight is indicative* that there are more corrective elements in use in the optical design - which are a necessity with wide angle lenses to reduce coma,astigmatism, controlling field curvature which all become increasingly problematic with wide lenses

*but by no means a infallible indicator
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