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05-09-2011, 01:10 PM   #1
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Doing something wrong?

I have a k-r and a tamron AF 70-300 1:4-5.6 LD lens. I mounted the lens but my camera won't take a picture. The f on the screen is blinking. Do I need to input a value for it? I have my camera switched to AF.

Help!


Last edited by mom2mny; 05-09-2011 at 01:11 PM. Reason: grammar
05-09-2011, 01:16 PM   #2
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Clean the lens contacts. If you still have the F... message, use another AF lens to test.
05-09-2011, 01:19 PM   #3
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Is the lens itself supposed to have an af/mf switch? This one does not. I know that there are different versions of lenses and I'm wondering if I bought one that is not compatible with the k-r.
05-09-2011, 01:26 PM   #4
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I have this lens (Pentax version). I don't remember there is a AF/MF switch on the lens. I do know usually the Canon lenses have that switch.

05-09-2011, 01:41 PM   #5
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Are you sure that the aperture ring is set at A and not at one of the numbers? Perhaps that maybe the problem. Other than that try cleaning the contacts.
05-09-2011, 01:42 PM   #6
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QuoteOriginally posted by mom2mny Quote
I have a k-r and a tamron AF 70-300 1:4-5.6 LD lens. I mounted the lens but my camera won't take a picture. The f on the screen is blinking. Do I need to input a value for it? I have my camera switched to AF.

Help!
That lens, if I am not mistaken, has an aperture ring on it - if it does, put the aperture in the "A" position (may need to push a small button on the ring to get it to click to it).

FYI: Settings number 22 (I think) in your program menu, setting that to allow aperture ring will also get you up and going and you won't need to have the "A" set on the lens...
05-09-2011, 01:42 PM   #7
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You need to set use of aperture ring to permitted. It's in the menu, but I don't have a Kr so I can't tell you exactly where in the menu. Your manual will tell you though.
05-09-2011, 02:28 PM   #8
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Thank you! It was indeed the aperture. I'm so glad I found this forum Thanks for helping me I out. I have close to no clue what I'm doing. But I'm learning something new every day.

05-09-2011, 04:21 PM   #9
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QuoteOriginally posted by mom2mny Quote
I have close to no clue what I'm doing.
You're in good company. We've all been there!
05-10-2011, 10:46 AM   #10
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I was going to say aperture ring. And the only reason I knew that is because I've done it myself (more than once, sad to say).
05-10-2011, 11:47 AM   #11
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People on this and other forums have often asked why Pentax made the default option to disallow use of the aperture ring, or why there was an option at all.

This episode is one possible reason. Had the OP's camera been set to allow the aperture ring, it would have happily taken pictures.

However, he would have noticed that, in Av mode, he could not change the aperture with the e-dial. In Tv mode, he could change the shutter speed all day, and the aperture would not change.

The camera would work in P mode, but due to an unchangeable aperture, the camera might have to resort to unacceptably long shutter speeds, or boost the ISO to noisy levels.

In other words, the OP might have been here complaining that his camera was all screwed up. Worse, he might have sent it to Pentax or CRIS for unneccessary warranty work.
05-10-2011, 02:11 PM   #12
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QuoteOriginally posted by noblepa Quote
People on this and other forums have often asked why Pentax made the default option to disallow use of the aperture ring, or why there was an option at all.

This episode is one possible reason. Had the OP's camera been set to allow the aperture ring, it would have happily taken pictures.

However, he would have noticed that, in Av mode, he could not change the aperture with the e-dial. In Tv mode, he could change the shutter speed all day, and the aperture would not change.

The camera would work in P mode, but due to an unchangeable aperture, the camera might have to resort to unacceptably long shutter speeds, or boost the ISO to noisy levels.

In other words, the OP might have been here complaining that his camera was all screwed up. Worse, he might have sent it to Pentax or CRIS for unneccessary warranty work.
I don't think this is correct. I've always had my cameras set to "aperture ring permitted" and my camera will still display the blinking "F--" if the aperture ring is out of the Auto mode.

What you say makes sense, but I don't think that's the case. I'll check it when I get home.

-------------
Okay, I just checked with my Bigma which has an aperture ring. I have my camera set to "aperture ring permitted". When I put the Bigma on the camera with the aperture ring on anything other than auto, I get "F--" in the LCD, but not blinking. I can also get a proper exposure so it works, just that the camera can't read the aperture value. So I stand corrected.

Last edited by rfortson; 05-11-2011 at 02:18 PM.
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