[WPRESTO]

The 28-105 is only about 19mm APS-C equivalent at the wide end. I would really miss the 16 from the 16-85 (not to mention the DA 15 Ltd).

To me, a moderately priced reasonably compact wide angle (equivalent to 15 or 16mm on APS-C) is the big gap in the current Pentax FF arsenal. The D FA 15-30 is not a carry-everywhere lens.

Of course there's the Samyang/Bower/Vivitar etc 14mm, optically very good from all the tests I've seen, not AF, and it may give some indication of the dimensions of a ~15mm SFL FF with good quality, even one with f4 max rather than f2.8. Look at the size of the discontinued Pentax FF manual focus 15mm. Nothing like the APS-C jewel.

[Lloyd_Christmas]

If I put the 16-85 on my old K-100D will it be okay?
I'm not going to mess up the lens am I?

[UncleVanya]

If I put the 16-85 on my old K-100D will it be okay?
I'm not going to mess up the lens am I?

K100d is a crop body without sdm. So manual focus only.

---------- Post added 05-19-16 at 12:27 AM ----------

A number of Pentax "crop lenses" are perfectly useable on FF, including the DA40, DA70, and even the DA 55-300. So I'm not going to jump to conclusions about the 16-85. I too am very interested to actually see it's coverage.

I am seeing mixed reports on the 55-300.

[npc]

Its understandable. Im hoping that a good portion will function though between the 30-85 range with minimal vignetting. Its one of my favorite lenses i like to use.

It's like this in the complete range. The circle size pretty much does not change when you zoom - only the border zone "fuzziness" changes

IMHO, either get proper FF lenses that will fully utilize the 36 mpix sensor or stay with aps-c.

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Last edited by npc; 05-18-2016 at 09:44 PM.

[Sandy Hancock]

To me, a moderately priced reasonably compact wide angle (equivalent to 15 or 16mm on APS-C) is the big gap in the current Pentax FF arsenal. The D FA 15-30 is not a carry-everywhere lens.

That is exactly why I was so pleased to find a good FA20
The FA20-35 isn't too bad either.

[Barry Pearson]

A number of Pentax "crop lenses" are perfectly useable on FF, including the DA40, DA70, and even the DA 55-300. So I'm not going to jump to conclusions about the 16-85. I too am very interested to actually see it's coverage.

I have a 16-85. It would be nice if it did cover a majority of the K-1 FF mode image gathering. It is nice that it can be used in the aps-c mode.

I'm looking for someone who has tried the lens on the camera, and can give an idea what they have found. The da* 55 is a crop lens but from what everyone is saying, it's usable for a ff lens.

I understand that you want some real results, it looks like for now we will have to wait. But I will just note that the chance of a DA prime working on FF is much larger than that of a DA zoom working, because many of the primes are based on FF designs. E.g. the DA* 200 f/2.8 and DA* 300 f/4 work flawlessly, because they are essentially FA lenses in a new coat. The same may be true for the DA* 55 f/1.4. But to my knowledge there is no DA zoom that is based on a FF design.

Please note that my earlier response was based on looking through the viewfinder of a K-1 with a DA 16-85mm lens attached. I've just done the test again.

At 16mm, the image circle nearly reaches the middles of the left and right sides, (although I won't dispute the image shown by "npc" above), and while it gets bigger at longer focal lengths, it doesn't cover the corners even at 85mm.

I didn't take a photo, but photos won't be any better than what I saw through the viewfinder. This is not an FF lens at any focal length, but it will provide more image that the pure APS-C crop, for example just above and below the APS-C region.

[WPRESTO]

Miserably gloomy morning, but I went out and tested the 16~85mm on my K1. Three shot sets taken @ 16mm, about 50mm, and 85mm, first set at a longer distance, second set closer, lens hood removed (it cuts off even more). For this lens, crop mode looks better. Files are JPEGs straight out of the camera, no PP of any kind.

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[Sandy Hancock]

As expected. Not within a bull's roar of a full frame lens.
Keep a crop camera, or get another lens.

[bdery]

I doubt it will perform well on the K-1.

Why shouldn't it? In crop mode it should be just as good as on APS-C.

[WPRESTO]

IN THEORY, a K1 in crop mode, straight shot, should provide resolution more or less like a K5 image taken with the same lens, although other factors, such color rendition, noise, and possible pixel-shift improvement might make the K1 image better. A K3 should have better resolution (=detail recording) because of 50% greater pixel count, but again, color rendition, noise, pixel-shift improvement might give the K1 image an advantage depending on the the subject. For images taken in dim light, high ISO, using pixel shift, the K1 image will probably better any current Pentax APS-C body.

[UncleVanya]

Why shouldn't it? In crop mode it should be just as good as on APS-C.

I think the implication was in non cropped mode.

[Fcsnt54]

Miserably gloomy morning, but I went out and tested the 16~85mm on my K1. Three shot sets taken @ 16mm, about 50mm, and 85mm, first set at a longer distance, second set closer, lens hood removed (it cuts off even more). For this lens, crop mode looks better. Files are JPEGs straight out of the camera, no PP of any kind.

Thank you
Although I'm slightly disappointed, im not surprised. I was hoping to at least be able to use it at the longer end. I might have to takes adam's advice with the 28-105 lens

[bdery]

Although I'm slightly disappointed, im not surprised. I was hoping to at least be able to use it at the longer end. I might have to takes adam's advice with the 28-105 lens

Of just use crop mode.

[elho_cid]

As expected. Not within a bull's roar of a full frame lens.
Keep a crop camera, or get another lens.

Maybe it could be usable with a TC - a 1.4x teleconverter essentially enlarges central portion of the image circle produced by the lens to cover the whole image sensor. I tried it with 1.7 TC, DA14 and DA50-200 and I could use those lenses as if they were full frame.

[UncleVanya]

Maybe it could be usable with a TC - a 1.4x teleconverter essentially enlarges central portion of the image circle produced by the lens to cover the whole image sensor. I tried it with 1.7 TC, DA14 and DA50-200 and I could use those lenses as if they were full frame.

It would be interesting to compare the shots taken in crop mode to those taken with a teleconverter.

On a related note are you saying that the 50-200 did not adequately cover FF? I ask because another person on the forum is claiming it does.