Tokina AF 28-70 f.2.6-2.8 AT-X 270af Pro II issues ??


Leech

Link Posted 03/09/2007 - 17:50
About this lens and the K10D.

Have just received this lens today from the US. But I have a problem with it because the "A" mode doesn't work properly.

On the camera it shows "F--" and when this happens it can't autofokus...

Can anybody help.. please tell me that it is simple to fix...

Thx
K10D, Pentax 18-55mm, Pentax 50mm f1.7 M, Pentax DA* 300mm f4, Da* 50-135mm f2.8, DA* 16-50mm f2.8, Tamron 28-70mm f2.6-f2.8

Daniel Bridge

Link Posted 03/09/2007 - 18:05
I would say the first thing to do is give the contact a quick clean, a soft cloth will do, just in case there's something on them that's preventing communication between the camera and lens.

Also, give the aperture ring a wiz back and forth, and make sure it's properly seated in the 'A' position. If this still doesn't work, try setting the custom function to allow lenses to be used with their aperture ring, and see if that allows the camera to function.

Just reading back through your post, not sure if you mean the 'A' mode on the camera or the lens. If you mean the canera, then the lens' aperture ring needs to be in the 'A' position also, otherwise the camera can't set the aperture.

Dan
K-3, a macro lens and a DA*300mm...

Leech

Link Posted 03/09/2007 - 18:30
sorry, I mean the A mode on the lens

thx..
i'll try, and then get back to you
K10D, Pentax 18-55mm, Pentax 50mm f1.7 M, Pentax DA* 300mm f4, Da* 50-135mm f2.8, DA* 16-50mm f2.8, Tamron 28-70mm f2.6-f2.8

Leech

Link Posted 03/09/2007 - 20:52
I have been toying a bit with the problem, and it seems like my camera doesn't recognize which Aperture is chosen.

I mean. When in Av-mode. If I change the opening on my camera, it changes the shutter speed. So the camera have contact to the lens, and it is able to change the aperture automatically.

But the camera doesn't recognice which Aperture opening is chosen, writing F--

At the same time, when I turn on my camera, it asks me for Shakereduction Focal length, like it doesn' t recognice its an Automatic lens... ??? (the only time it asks me this is when I use my manual 50mm f1.7 KA-mount) ??

What am I doing wrong ?
K10D, Pentax 18-55mm, Pentax 50mm f1.7 M, Pentax DA* 300mm f4, Da* 50-135mm f2.8, DA* 16-50mm f2.8, Tamron 28-70mm f2.6-f2.8

George Lazarette

Link Posted 03/09/2007 - 23:53
Leech wrote:

What am I doing wrong ?

You are putting a Tokina lens on a Pentax camera.

How old is the lens? If it is more than "a certain age", it won't necessarily be compatible with the modern K-mount.

G
Keywords: Charming, polite, and generally agreeable.

niblue

Link Posted 04/09/2007 - 10:56
George Lazarette wrote:
Leech wrote:

What am I doing wrong ?

You are putting a Tokina lens on a Pentax camera.

So are you, given you've just bought a 16-50 F2.8, even if it does have Pentax badges on...

I've had 3 Tokina ATX-Pro lenses for many years, including the 28-70 F2.6-2.8 and not had compatability problems with any Pentax SLR or D-SLR so far.

In this case it sounds like the issue probably does relate to the electrical contacts between the lens and camera not making a good connection. Check the contacts on the lens to see if the central connector any any of them is depressed further than it should be - I've seen that a couple of times with lenses (including Pentax's own ones).

For the AF problem can you check the focus ring is in the AF position and not MF (the ATX-Pro's are like the FA* Pentax lenses in having a focus ring with two positions so that it doesn't rotate when in AF) - I got my ATX-Pro 20-35mm F2.8 cheap because the person selling it on Ebay though the AF didn't work when it was just because they had the focus ring in the wrong position.

Leech

Link Posted 04/09/2007 - 11:13
ok, I'll look into it again, when I get home from work.

I did notice the auto/manual focus ring change. Heh..

The auto fokus was working the first minutes it was on the camera. But now only the manual focus works...
K10D, Pentax 18-55mm, Pentax 50mm f1.7 M, Pentax DA* 300mm f4, Da* 50-135mm f2.8, DA* 16-50mm f2.8, Tamron 28-70mm f2.6-f2.8
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