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12-14-2016, 04:03 AM   #1
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Can I use lenses for Pentax-k5 on Pentax-k1 if I upgrade ?

Hi all,

I am using Pentax-K5. I have sigma 18-250mm, Tamron 100 mm macro, Pentax 50 mm lenses. I am planning to buy Pentax 35 mm also. If I upgrade my camera to Pentax-K1, can I use these lenses ?

Thank you .

12-14-2016, 04:19 AM   #2
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Yes, but some only in crop mode.

The Sigma 18-250 is a crop lens. I am unaware of a Tamron 100mm macro; do you mean the 90mm? That is Full Frame, and performs beautifully on the K-1. The Pentax 50mm f/1.4 and f/1.7 are both full frame. Which 35mm are you talking about? The f/2.4 AL is a crop lens, but I think gets reasonably close to FF.
12-14-2016, 04:46 AM   #3
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QuoteOriginally posted by Paul the Sunman Quote
Yes, but some only in crop mode.

The Sigma 18-250 is a crop lens. I am unaware of a Tamron 100mm macro; do you mean the 90mm? That is Full Frame, and performs beautifully on the K-1. The Pentax 50mm f/1.4 and f/1.7 are both full frame. Which 35mm are you talking about? The f/2.4 AL is a crop lens, but I think gets reasonably close to FF.
Thank you for the quick reply. sorry Tamron 90 mm macro 2.8, Pentax SMC DA 50 mm 1.8. Planning to buy Pentax SMC DA 35 mm
12-14-2016, 05:13 AM   #4
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The DA 50 1.8 works very good in FF mode on the K-1. I just tried it out for the first time a couple weeks ago and was very happy with the results. I just bought the DA 35 but have not had a chance yet to try it out yet, but people do say it's almost a FF lens.

12-14-2016, 07:56 AM   #5
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If you're talking the DA35 f2.4 (and not the limited), then yes it will work. The plastic fantastic 35 and 50 lenses seem a little flat and dull on the k-1 to my eyes - certainly they are better lenses on APSC imho. (But I am comparing them to FA limiteds, so make of that what you will). Your macro lens should really shine however. The 18-250 is probably going to be crop mode only.
12-14-2016, 08:08 AM   #6
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QuoteOriginally posted by robthebloke Quote
If you're talking the DA35 f2.4 (and not the limited), then yes it will work. The plastic fantastic 35 and 50 lenses seem a little flat and dull on the k-1 to my eyes - certainly they are better lenses on APSC imho. (But I am comparing them to FA limiteds, so make of that what you will). Your macro lens should really shine however. The 18-250 is probably going to be crop mode only.
What he said. ^
12-14-2016, 09:25 AM   #7
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QuoteOriginally posted by robthebloke Quote
The 18-250 is probably going to be crop mode only.
I put this on one of my film bodies a short while back and it appeared to vignette (in circular fashion, no less!!) at every focal length. Not a full-frame lens by any stretch of the imagination. The good thing about crop mode with the K-1 is that the crop zone is crammed full of AF points, and going up from a K-5, the small hit you'll take in sheer megapixels in crop mode should be compensated by everything else the newer camera can do better.

12-14-2016, 01:10 PM   #8
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I would like to add, that I have a K-5 and have just received a K-1 and I'm impressed with the image quality when pixel peeping. While I intend to use mine mostly in FF mode, in my opinion overall image quality in crop is somewhat better than the K-5 (original version anyway) - largely due to having no low pass filter. The improved AF in particular is very welcome!
12-14-2016, 05:43 PM   #9
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Even the 18-250mm will work, Photo-king, but the picture will be the same framing as your K-5 and will only have 15Mp.
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