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05-19-2010, 05:25 PM   #1
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lens question - manual lens won't fire

I just bought a pentax kx today and love it! My question is I have a quantaray auto zoom 28-80mm that I had with my old 35 mm pentax camera I was told that I could use it with my kx it attaches ok and I put the kx on manual but for some reason when I tried to take a picture and pressed the button it would not take. Any help would be appreciated...

05-19-2010, 05:35 PM   #2
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I'm moving this to the beginners' corner.

Please have a look at this article: https://www.pentaxforums.com/forums/pentax-dslr-camera-articles/100260-manual...ic-lenses.html

Specifically, what you're looking for is this:

QuoteQuote:
Also, make sure that in the menu, you've allowed the aperture ring to be in a position other than 'A'; this is a custom function.

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05-20-2010, 07:56 AM   #3
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I still cannot help but wonder why Pentax would put in this restriction in the first place. Seems like a programer would have at least spoken up to suggest that they were creating two programs when there is only a need for one. Why make it an option to either? Can anyone suggest why they simply did not set up the camera to accept all by default?
05-20-2010, 09:35 AM   #4
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Another silly thing is to make sure your focus is set to manual. If you are in auto and the camera thinks your shot isn't in focus it will not late you release the shutter.

05-20-2010, 03:35 PM   #5
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QuoteOriginally posted by Nowhere Matt Quote
I still cannot help but wonder why Pentax would put in this restriction in the first place. Seems like a programer would have at least spoken up to suggest that they were creating two programs when there is only a need for one. Why make it an option to either? Can anyone suggest why they simply did not set up the camera to accept all by default?
I don't think anyone knows, but every time someone has wondered this before, I or someone else has suggested it could be so that you aren't deluded into thinking you can just keeping shooting in Green mode or P mode or Av mode as usual, but you have to learn a new way of shooting (using M mode and Green button). This seems plausible, at least - that is is designed to be a wakeup call to get to check into what's going on so you don't just start shooting away in modes other than M not realizing that the aperture ring is being ignored.
05-20-2010, 05:26 PM   #6
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Autofocus

I would say that your camera is in the autofocus mode and the camera will not fire because the lens is not focused.There is a feature in the pentax cameras called catch in focus that will not let the camera fire when it is in autofocus mode and the lens is manual or in manual mode.The green light in the viewfinder at the bottom that will light up when in focus and you should also hear a beep,this is focus confirmation,if the camera is in autofocus mode turn the focus on the lens slowly while holding down the shutter button and when it hits the focus it should fire.There is no need to shoot in manual mode unless you are using a screw mount lens or an "M" lens the camera will meter the light as it always does you'll just need to turn the aperature ring by hand and of course focus by hand.P.S. I suggest you always look for the focus confirmation light in the viewfinder since it is very accurate,you'll get sharp in focus shots by just turning the focus slowly until it lights up.

Last edited by bschriver11; 05-20-2010 at 05:42 PM.
05-20-2010, 05:44 PM   #7
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QuoteOriginally posted by Nowhere Matt Quote
I still cannot help but wonder why Pentax would put in this restriction in the first place. Seems like a programer would have at least spoken up to suggest that they were creating two programs when there is only a need for one. Why make it an option to either? Can anyone suggest why they simply did not set up the camera to accept all by default?
I think it's to prevent people with little technical experience from even asking what the aperture ring. Maybe it backfires a bit, but it's there and we have to deal with it

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05-21-2010, 10:16 AM   #8
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Ah, yes, I totally forgot about auto-exposure lenses that have aperture rings. The default setting for the option gives you immediate feedback that something is wrong if you accidentally (or not accidentally) move the aperture off the "A" position. Which is worth something, but whether or not it's really better than making the other setting the default I cannot say.

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