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03-19-2013, 06:34 AM   #1
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Catch in focus help

Hello, my name is Cecil , Im new question is, I have been experimenting with the catch in focus feature on my K-x and with a 28mm mf lens it works fine, when I attach my 500mm mf lens it fires as soon as i press the shutter release, neither lens has any contact points for data transmission, but the base on the 28mm is shiny chrome looking, and the 500mm is black metal. Any Ideas?

03-19-2013, 07:11 AM   #2
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place a peace of aluminium foil on the mount of your 500mm where the contacts of your DSLR will be. Then it will work the same way.
03-19-2013, 07:49 AM   #3
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QuoteOriginally posted by Halftufish Quote
the base on the 28mm is shiny chrome looking, and the 500mm is black metal.
As indicated by carrrlangas above, the base must be electrically conductive and it must touch the electrical contacts on the body for CIF to work. I guess that your 500mm lens has a T2 mount? If so, it is easy to sand the T2 mount base down to the bare metal where it meets the contacts and make it conductive that way. If it is an M42 mount, things may be a bit more complicated:
03-19-2013, 07:56 AM   #4
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Thanks Stone G. for your explanation. I recognize I was lazy.

03-29-2013, 05:32 PM   #5
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Thanks to you both, I thought maybe I could find a t2 mount to k mount in chrome but no luck , i'll try sanding.
03-30-2013, 07:11 AM   #6
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Do let us all know, how you get on with this issue.
03-31-2013, 03:27 PM   #7
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You should only need to short the digital info contact - the one nearest to the 6 o'clock position. With the 500mm lens (mirror ?) the problem is going to be insufficient brightness for the AF system to operate, so unless you've got an unusually fast 500mm you'll never get it to work. The question is - would it work on the K-5ii with slower lenses as the AF system there is supposed to be more sensitive ?

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