Nikkor 180mm f2.8 ED Ai-s on Pentax KX?

ctron · 08-14-2014, 01:11 AM

Will the subject mentioned manual focus lens fit a Pentax KX? If so, will infinity focus be reached? Besides having the drawback of no autofocus, what other compromises are there? Any vignetting issues? A friend of mine has this lens and wants to part with it, but I didn't know if there was any way to fit it to the Pentax successfully. Thanks in advance, Eric

**seventhdr** · 08-14-2014, 03:06 AM

You can mount it, but as the Pentax and Nikon mounts have differences, you won't be able to lock it on to your camera. So it could work loose. No Auto-Focus. No Auto-Exposure. Behaves as a K or M lens not as an A, F FA or DA lens.

You could replace your lens mount with a new one called the K multi mount or some thing like that.

Regards

Chris

ctron · 08-14-2014, 06:16 AM

Interesting, I came across this thread while doing a search here:

https://www.pentaxforums.com/forums/26-mini-challenges-games-photo-stories/25...ml#post2722682

This must be the multi mount you're talking about. I'll have to see if it will work with this combination, or does anyone know?

RonHendriks1966 · 08-14-2014, 07:17 AM

You need a lens with aperture controll, since the camera doesn't You can mount it directly or with an adapter.

ctron · 08-17-2014, 01:30 AM

Thank, guys. Unfortunately, the mult-adapter above won't work as the weight of this lens is too great for the adapter to be reliable. I don't see why I couldn't use a straight metal bar with spacer and hose clamp around the lens, then use the tripod screw to support on the other side. This would greatly remove the weight issue from the camera.

RonHendriks1966 · 08-17-2014, 02:51 AM

Don't put the weight on the adapter. So monopod on the lens and hold the body. I used an older pre-AI 300mm/f4.5 with adapter, making it effectively 375mm/f5.6 since there is glass in the adapter that makes it like a 1,25x TC. Worked fine and the glass was great. Some fringing, but then again the lens was 40 years old or so.

08-14-2014, 01:11 AM	#1
ctron Junior Member Join Date: Aug 2014 Posts: 32	Nikkor 180mm f2.8 ED Ai-s on Pentax KX? Will the subject mentioned manual focus lens fit a Pentax KX? If so, will infinity focus be reached? Besides having the drawback of no autofocus, what other compromises are there? Any vignetting issues? A friend of mine has this lens and wants to part with it, but I didn't know if there was any way to fit it to the Pentax successfully. Thanks in advance, Eric

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08-14-2014, 03:06 AM	#2
seventhdr Site Supporter Join Date: Mar 2007 Location: Christchurch, New Zealand Photos: Gallery Posts: 1,443	You can mount it, but as the Pentax and Nikon mounts have differences, you won't be able to lock it on to your camera. So it could work loose. No Auto-Focus. No Auto-Exposure. Behaves as a K or M lens not as an A, F FA or DA lens. You could replace your lens mount with a new one called the K multi mount or some thing like that. Regards Chris

08-14-2014, 06:16 AM	#3
ctron Junior Member Join Date: Aug 2014 Posts: 32 Original Poster	Interesting, I came across this thread while doing a search here: https://www.pentaxforums.com/forums/26-mini-challenges-games-photo-stories/25...ml#post2722682 This must be the multi mount you're talking about. I'll have to see if it will work with this combination, or does anyone know?

08-14-2014, 07:17 AM	#4
RonHendriks1966 Banned Join Date: Jan 2009 Photos: Gallery Posts: 9,675	You need a lens with aperture controll, since the camera doesn't You can mount it directly or with an adapter.

08-17-2014, 01:30 AM	#5
ctron Junior Member Join Date: Aug 2014 Posts: 32 Original Poster	Thank, guys. Unfortunately, the mult-adapter above won't work as the weight of this lens is too great for the adapter to be reliable. I don't see why I couldn't use a straight metal bar with spacer and hose clamp around the lens, then use the tripod screw to support on the other side. This would greatly remove the weight issue from the camera.

08-17-2014, 02:51 AM	#6
RonHendriks1966 Banned Join Date: Jan 2009 Photos: Gallery Posts: 9,675	Don't put the weight on the adapter. So monopod on the lens and hold the body. I used an older pre-AI 300mm/f4.5 with adapter, making it effectively 375mm/f5.6 since there is glass in the adapter that makes it like a 1,25x TC. Worked fine and the glass was great. Some fringing, but then again the lens was 40 years old or so.