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11-04-2011, 02:42 PM   #1
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Pentax K-x + SMC 75-150 f4 problem

Hi, I have my K-x for almost a year now and I've been using it with the default 18-55 lens without any problem.

I recently bought, on ebay, a Pentax SMC 75-150 f4 lens, from a seller with 100% feedback and only good reviews (over 2000 sells, mostly photo related).

I recieved it today, it appears to be in good condition but when I mounted it on my K-x I cant take any photo with it.

Where the f value should be I just get F - - - flashing and I can't change the shuter speed.

I have tryed reseting the camera settings fo default but it didn't make a difference. The camera is running on it's original 1.00 firmware, is this a problem?

I atached a picture showing the config menu whit the lens mounted:

Hope you can help me with this.

Best regards

11-04-2011, 03:26 PM   #2
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Most likely you need to allow the use of the aperture ring (and then using stop down / green button metering), see:
11-04-2011, 04:09 PM   #3
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The lens is an M lens--> you need to set the camera to the M mode, then press the green button to take an exposure.

Last edited by causey; 11-04-2011 at 04:28 PM.
11-04-2011, 06:52 PM   #4
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QuoteOriginally posted by causey Quote
The lens is an M lens--> you need to set the camera to the M mode, then press the green button to take an exposure.
This will work only if you have set the camera to Permit Aperture Ring. It is in the camera's menus.

11-04-2011, 06:55 PM   #5
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Thanks a lot for both your replys. I have solved my problem.

It was probably a noobish thing but the camera is not actualy mine, it's my girlfriend's but i'm the one who is called up to solve all the "technological problems", specially when it involves English (we are form Portugal).

I will definetly be attending this forum more often and try to learn a bit more even though I don't own the camera.

Once again, thanks a lot.

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