Re: refusal to even attempt to focus

I've never heard of that, and none of the F series lenses I  own, admittedly a relatively small subset works like that. On 12/19/2017 3:38 PM, Daniel J. Matyola wrote: I believe that, on some of the older lenses, like the "F" series, the aperture ring had to be set in the "A" position in

Re: refusal to even attempt to focus

In any case, the camera refusing to seek focus is an intermittent occurrence. It might have to do with heavy backlight, or something else. Anthony Farr wrote: The electrical contacts between lenses and bodies are usually kept clean by the mounting and dismounting process. Each time you turn a

Re: refusal to even attempt to focus

Daniel J. Matyola wrote: >I believe that, on some of the older lenses, like the "F" series, the >aperture ring had to be set in the "A" position in order for the camera to >be able to autofocus the lens. Nope. F series lenses will autofocus with the aperture ring off the 'A' position. -- Mark

Re: refusal to even attempt to focus

I believe that, on some of the older lenses, like the "F" series, the aperture ring had to be set in the "A" position in order for the camera to be able to autofocus the lens. Dan Matyola http://www.pentaxphotogallery.com/danieljmatyola On Tue, Dec 19, 2017 at 3:32 PM, mike wilson

Re: refusal to even attempt to focus

Why would manual aperture setting affect the ability to autofocus? > On 19 December 2017 at 13:23 "Daniel J. Matyola" wrote: > > > You guys are all snarter than me. > > A while back, I had an older lens on my K-5 IIs that refused to focus. I > struggled with it quite a

Re: refusal to even attempt to focus

You guys are all snarter than me. A while back, I had an older lens on my K-5 IIs that refused to focus. I struggled with it quite a while before it dawned on me that I had neglected to place the aperture setting on "A" D'uh! Dan Matyola http://www.pentaxphotogallery.com/danieljmatyola --

Re: refusal to even attempt to focus

The electrical contacts between lenses and bodies are usually kept clean by the mounting and dismounting process. Each time you turn a lens towards the lock position, or away from it, it wipes clean the contacts by a very small amount. So, a seldomly mounted or changed lens only gets cleaned

Re: refusal to even attempt to focus

Anthony Farr wrote: First you need to isolate the fault to either the lens or the camera body. You have other camera bodies so start by determining if the Bigma behaves or misbehaves on those. regards, Anthony I've had similar problems with the lens on other bodies. I don't tend to use

Re: refusal to even attempt to focus

On 12/18/2017 01:49, Larry Colen wrote: This afternoon I was photographing a heron at the Waldport seawall with my K-1 and sigma 50-500 during low tide.  It had flown from one spot to another, I was walking back to the new spot, photographing as I went, and at one point the camera went

Re: refusal to even attempt to focus

On Mon, Dec 18, 2017 at 3:16 AM, Anthony Farr wrote: > First you need to isolate the fault to either the lens or the camera > body. You have other camera bodies so start by determining if the > Bigma behaves or misbehaves on those. > regards, Anthony Similar problem this

Re: refusal to even attempt to focus

Larry, I'd try cleaning the contacts on the lens. "Spit & Polish". Alan C -Original Message- From: Larry Colen Sent: 18 December, 2017 8:49 AM To: Pentax-Discuss Mail List Subject: refusal to even attempt to focus This afternoon I was photographing a heron at the Waldport seawall

Re: refusal to even attempt to focus

First you need to isolate the fault to either the lens or the camera body. You have other camera bodies so start by determining if the Bigma behaves or misbehaves on those. regards, Anthony On 18 December 2017 at 17:49, Larry Colen wrote: > This afternoon I was photographing a