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Pentax 80-320mm autofocus not working

No autofocus

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On a 645n, does the autofocus not work unless film is loaded first?


You're posted in Instant Cameras. More likely you need help with film camera.

Oct 14, 2014 | Pentax 645N Medium Format Camera

1 Answer

I want to use my old k 1000 lenses on one of Pentex's new camera body's.


Your old Pentax lenses uses the Pentax K mount. The current Pentax digital SLRs all use the same K mount so the lenses will fit on them. You obviously won't get all the features available on new lenses, such as autofocus, but they should all work fine.

Dec 31, 2012 | Pentax K Cameras

1 Answer

Can I use the old lenses on a new camera


Your old Pentax lenses uses the Pentax K mount. The current Pentax digital SLRs all use the same K mount so the lenses will fit on them. You obviously won't get all the features available on new lenses, such as autofocus, but they should all work fine.

Dec 31, 2012 | Pentax K1000 35mm SLR Camera

1 Answer

I have a Pentax K10D from the time they were first sold. I have not installed any firmware as not very technically talented. Have recently bought a Sigma 120-400 zoom.( no zooms of this range from...


Only Pentax DA and FA J lenses and D FA/FA/F/A lenses having an "A" position on the aperture ring can be used with this camera.

The lens you have is HSM DG

Jun 10, 2017 | Pentax Cameras

2 Answers

Doesnt seem to work with the lens which was on my old K1000 which is a SMC Pentax-M1:2 50mm, serial number 5918334 any ideas?


Although your lens is an older manually operated K mount and will physically fit onto your camera, there are incompatibilities which limit the level to which it is compatible with your *ist DS.

Ignoring the really obvious difference that your lens is totally incapable of autofocus, the first real incompatibility is that your camera body has one of the "crippled" versions of the KAF (autofocus) mount. This means that it lacks the mechanical stop-down coupler/indicator used on the original K mount. The result is that your camera body does not sense which aperture the lens is set to and will not stop the lens down to the selected aperture when you press the shutter release. The full specification KAF mount maintains these old mechanical legacy couplings, but as most owners don't use older lenses any more the crippled KAF isn't an issue to most users and significantly reduces manufacturing costs. Crippled KAF lenses can still use some manual K lenses, but only the ones which have the A setting on the aperture ring and your lens pre-dates this development.

Your only realistic fixes for this are to either replace the camera body with a model supporting the full KAF mount (expensive) or to use later K lenses with the description SMC Pentax A instead of earlier SMC Pentax M. You'll still lack autofocus but as long as the lens aperture ring is set to the A position then it will work when the body is set to shutter priority and Automatic modes. There are far more Pentax A lenses remaining in good condition than Pentax M so you should have no trouble finding them, but because of their compatibility with later mounts you'll find that prices are somewhat higher.

Note that there is no adaptor which will allow you to improve compatibility between your present camera and the lens you have asked about.

I hope that I've answered your question, if so please take a moment to rate my reply. If not, perhaps you should add a comment to further explain in which way your camera doesn't work with your lens and I'll then try to assist you further.

Sep 13, 2010 | Pentax *ist DS Digital Camera

1 Answer

What does smcp -fa mean


SMCP- means: Super MultiCoated Pentax (a term that refers to the anti-relctive coatings that Pentax has been using on its lenses for years F-means it is a lens designed to cover the larger area required of a lens for Film camera use versus the smaller sensor of the Digital SLRs Pentax also makes. Pentax also makes DA lenses , which will only work with their digital SLRs. A- means it will work in fully automatic mode on cameras that have the ability to set shutter speed and F-stop automatically (most modern Pentaxes) It should also be noted that all DA and FA pentax lenses have a modified version of the original Pentax K lens mount, which replaced their first lens mount, the universal M42 used by so many early film SLR manufacurers- this concluded todays pentax lens history

Jun 02, 2010 | Pentax Zoom Wide Angle SMCP-FA 28-105mm...

1 Answer

Slow to autofocus and sometimes will not focus at all with my pentax k10d slr digital camera with a pentax 16-50 da lens. when I switch to manual focus the camera works fine.


Clean the contacts on the camera body and the lens where they connect with a cotton swab lightly dampened with rubbing alcohol.

Sep 27, 2009 | Pentax K10D Digital Camera

2 Answers

Pentax *ist DS digital SLR Autofocus problem


Being an SLR camera, you should try another lens. It may be a servo fault in the lens. If the lens is okay, then it can be anything in the lens sensing, lens control drive circuits, and or lens to camera interface area. This would have to be properly diagnosed and serviced.

Jerry G.

Oct 11, 2008 | Pentax *ist DS Digital Camera

2 Answers

I BOUGHT A PENTAX K10D THAT CAME WITH A VERY NICE AUTO ZOOM LENS. I OWN SEVERAL OLDER PENTAX LENSES THAT I USED ON MY K1000 CAMERA AND I WANT TO USE THEM ON THE K10D. I CANNOT FIGURE OUT THE SETTINGS THAT...


Hello,

I don't own a K10D, but I do own a K100D which I have successfully used both manual focus & auto-focus lenses from my old Pentax stash!

1) If it is a manual focus lens, you need to turn off Autofocus on the body of your K10D. On my K100D, there is a switch on the side of the lens mount that says [-MF or -AF]. "-MF" is manual focus mode & "-AF" is autofocus mode. Since your lens doesn't have autofocus capability, turn it to the "-MF" mode.

Also . . . When I press "Menu" and go to "Custom Setting", I change two settings . . .

1) I change "Using aperture ring" to "Permitted". This allows you to use manual lenses (M lenses) that do not have an auto(exposure) setting, and also lets you use Auto lenses (A, KA, KA2, FA, etc.) in either the Auto or manual aperture setting modes.

2) I change "Fl with S lens used" so that even with a manual focus lens, although I don't have autofocus capability, my K100D beeps and shows a little red square in the viewfinder when I have successfully focused manually!

The K10D should have the same options.

This should get you up and running!

I have had a load of fun with my old lens on my new digital Pentax!

Take care & Happy Imaging!
Glen
:)

Jul 14, 2008 | Pentax K100D Super Digital SLR Camera

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