Pentax K-r + Pentax SMC F 35-80mm 1:4-5.6

Rexjarvis · 07-03-2015, 12:34 AM

Hi,

Sorry if this is a daft question but I am wondering about the compatibility of my Pentax SMC F 35-80mm 1:4-5.6 AF Lens and my K-r.

Sometimes the AutoFocus works and other times it does not. When I use it in manual mode it is a really great lens but my problem is slightly blurry eyesight so the AF is really needed, I mess up too many shots in manual mode :-(

Thanks for your help,
Rex.

max_pyne · 07-03-2015, 12:52 AM

have you tried to clean the contacts?

Rexjarvis · 07-03-2015, 01:44 AM

Originally posted by max_pyne

have you tried to clean the contacts?

I have used alcohol 96 to clean them and it doesn't help. One time in ten I will attach the lens and everything is fine - the other nine times I have to use manual focus. Could it be the motor?

I take it that they are compatible and this is a problem with the lens?

**THoog** · 07-03-2015, 06:09 AM

Almost all old Pentax lenses are compatible with all modern bodies - the FA 35-80 certainly is (I have one, and have never had the problems you describe). If remounting the lens works sometimes, it suggests an electrical problem, either in the lens or body, but I wouldn't think it was the motor. Is it just missing focus, or not turning at all? Do you have any other autofocus lenses?

Rexjarvis · 07-03-2015, 07:06 AM

Originally posted by THoog

Almost all old Pentax lenses are compatible with all modern bodies - the FA 35-80 certainly is (I have one, and have never had the problems you describe). If remounting the lens works sometimes, it suggests an electrical problem, either in the lens or body, but I wouldn't think it was the motor. Is it just missing focus, or not turning at all? Do you have any other autofocus lenses?

Hi,

All my other lenses work fine so the K-r body is fine. It has to be the lens. It is only the focus that is not working, with the camera and lens set to full auto the aperture is always good. I just almost always need to throw the manual focus switch on the camera body because of the focus problem.

Thanks.

07-03-2015, 12:34 AM	#1
Rexjarvis New Member Join Date: Oct 2014 Location: Friesenheim Posts: 13	Pentax K-r + Pentax SMC F 35-80mm 1:4-5.6 Hi, Sorry if this is a daft question but I am wondering about the compatibility of my Pentax SMC F 35-80mm 1:4-5.6 AF Lens and my K-r. Sometimes the AutoFocus works and other times it does not. When I use it in manual mode it is a really great lens but my problem is slightly blurry eyesight so the AF is really needed, I mess up too many shots in manual mode :-( Thanks for your help, Rex.

07-03-2015, 01:44 AM	#3
Rexjarvis New Member Join Date: Oct 2014 Location: Friesenheim Posts: 13 Original Poster	Originally posted by max_pyne have you tried to clean the contacts? I have used alcohol 96 to clean them and it doesn't help. One time in ten I will attach the lens and everything is fine - the other nine times I have to use manual focus. Could it be the motor? I take it that they are compatible and this is a problem with the lens? Last edited by Rexjarvis; 07-03-2015 at 02:31 AM.

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07-03-2015, 12:52 AM	#2
max_pyne Pentaxian Join Date: Aug 2010 Location: zurich Photos: Gallery \| Albums Posts: 409	have you tried to clean the contacts?

07-03-2015, 06:09 AM	#4
THoog Loyal Site Supporter Join Date: Aug 2012 Location: North Carolina Photos: Gallery \| Albums Posts: 3,685	Almost all old Pentax lenses are compatible with all modern bodies - the FA 35-80 certainly is (I have one, and have never had the problems you describe). If remounting the lens works sometimes, it suggests an electrical problem, either in the lens or body, but I wouldn't think it was the motor. Is it just missing focus, or not turning at all? Do you have any other autofocus lenses?

07-03-2015, 07:06 AM	#5
Rexjarvis New Member Join Date: Oct 2014 Location: Friesenheim Posts: 13 Original Poster	Originally posted by THoog Almost all old Pentax lenses are compatible with all modern bodies - the FA 35-80 certainly is (I have one, and have never had the problems you describe). If remounting the lens works sometimes, it suggests an electrical problem, either in the lens or body, but I wouldn't think it was the motor. Is it just missing focus, or not turning at all? Do you have any other autofocus lenses? Hi, All my other lenses work fine so the K-r body is fine. It has to be the lens. It is only the focus that is not working, with the camera and lens set to full auto the aperture is always good. I just almost always need to throw the manual focus switch on the camera body because of the focus problem. Thanks.