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Focusing on Pentax lens

Bought a lens on e--bay to replace old lens, both smc a-zoom1;3.5 35-105mm, new lens has maco feature. could you please explain what this feature is and how it works?

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Yes, fixed problem, on official pentax site forum.

Posted on Sep 13, 2008

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Yes. The new digital model cameras will accept the older K-AF lenses.

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Can the 1.4X-L converter A be used with an FA* 400mm f/5.6 lens ?


Consider a few points. Most camera's (The Pentax is no exception here) can only use AF till f/1:5,6. With a tele convertor 1.4 times, your aperture will be twice as small. So it will become 8.
So yes you can use the converter on your Pentax, but the camera can't work with autofocus. If there is enough light, you could be able to manual focus the lens and still make a shot.

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Hi, expert, I'm a beginner. Just bought the pentax da 35mm 2.8 macro but don't know how to use it. It's so noisy and I don't know what the noise means. Help. It doesn't focus as easily as the lens that...


This lens has an automatic aperture, which is the cause of the noise you are mentioning. It's a motor constantly adjusting the diaphragm inside the lens to compensate for different lighting conditions.
Your lens also uses automatic focus, which can be sluggish with this particular lens. I would advise using the manual focus, which gives you greater control, and with enough practice, nicer looking pictures.
Good luck, and have fun!

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I have an old pentax film camera and bought a sigma 100-300mm f4.5-6.7 DL lens to go with it. I believe the lens is compatible with Pentax dslr. If I was to update to DSLR what other camera brands would it...


If I am not mistaken all lens can pretty much work with other cameras provide that the attachment is compatible. Having said that with the new SLR cameras with auto focus of the lens the lens itself has a motor and it would be difficult to attach it to a manual SLR. Save yourself the headache and if you can purchase same manufacturer for camera body and lens life would be wonderful. In the past I thought that I could save money and do the swap thing and it just became too much. In addition the new cameras that are out has wonderful features like anti vibration, smooth focusing and the sensors are just dynamite. Good Luck

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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.

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How to mount Minolta AF 28-80/3.5-5.6 on pentax


Unfortunately, it is not possible to mount Minolta lenses on a Pentax K mount camera and retain either auto-focus, metering, or the ability to focus at infinity.
The reason for the loss of the ability to focus at infinity is because the distance from the mount to where the image forms on a Minolat lens is 43mm, whereas on a Pentax it is 46mm, so the Minolta lens glass would need to be 2mm into the body of the Pentax camera in order for the image to form on the sensor (i.e. have a clear image that is in focus).
The only solution to this is to purchase an adapter with an optical element such as this: http://photo-adapter-llc.amazonwebstore.com/Zykkor-Minolta-MD-Lens-to-Pentax/M/B004PB8142.htm?traffic_src=froogle&utm_medium=CSE&utm_source=froogle This will allow you to focus at infinity, however you will have to use stop down metering and manual focus, as the electrical contacts will not connect. Also, you can expect a slight loss of image quality when using an adapter.
I personally have a few Minolta lenses that I have wanted to use on my Pentax, so I understand your pain. It is a shame they don't work better.
Thank you for using FixYa!

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Pentax K110D and Sigma 17-35mm F2.8-4 EX DG


The Penta K110D has a 1.5X crop factor so a 17mm lense would be the equivalent to 25.5mm (in 35mm standard), therefore may not give you a 103 angle view. You would not really notice that much difference between 17 and 18mm.

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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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Pentax K10D won't work with lens from Pentax K100 (film0


The lenses are probably manual focus lenses,  
  1. Make sure that the apature ring is set to 'A' or automatic, 
  2. if these are manual focus lenses then switch the focus switch on the left side of the camera body to MF 
  3. If this still doesn't work, or you are having trouble with the apature ring then press the menu button to go to the  menu then press the right arrow key untill you are in the  Custom Settings, scroll through the custom settings with the up and down arrow keys until about the 2nd from bottom there is an option called "using aperture ring" set this to 2 (Permitted) This will make the camera take a image when lens is on any f-stop manually. 
Try this and everything should work fine. If all this hasn't worked then try seting the mode dial on the camera to M manual mode. Cheers

Feb 12, 2008 | Pentax K10D Body Only Digital Camera

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