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01-09-2016, 12:47 PM   #1
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SMC Pentax 67 300/4 on 645

I just got this lens from Japan pretty cheap and thought I'd give it a try based on MikeSF's results with a similar one.
I'm using the Photodiox 67 to 645 adapter for my 645D. I put flat black paint inside the adapter as I have heard needs to be done for reducing reflections.
Everything seems to be good but I'm curious about how this lens/adapter/body combo all works together.

Is the 645D mount "crippled" like the K mount is for old lens aperture adjustments? Or can I somehow get feedback on the D when changing the aperture ring? It looks like there are two levers in the 645 mount to do that.

I'd love to see the D recognize the aperture setting if possible, and ideally control it. Is either of these things possible? I didn't see that "Allow use of aperture ring" setting in there but the lens has an auto/manual switch I imagine is for aperture. I'm hoping that will allow what I'd like to see but I could also live with stop down metering via the green button if need be. I do that with some old Leica glass on K mount and it works well enough.

Just want to get the gist of how these can best work together. Thanks!


Last edited by mattb123; 01-09-2016 at 01:05 PM.
01-09-2016, 01:42 PM   #2
Ole
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The 645D mount is not crippled, so you can shoot with open aperture metering in M and Av exposure modes if the adapter supports it.

I have used 67 lenses on the 645D and Z with a genuine Pentax adapter with no problems.
01-09-2016, 10:02 PM   #3
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The camera understands the aperture you are using, but cannot control it (there is no way for any body to control the aperture on a Pentax 67 lens).
01-10-2016, 12:26 AM   #4
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I use the 300mm and 135mm with adapter. so far so good iq is fine.

01-11-2016, 10:54 AM   #5
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QuoteOriginally posted by bull drinkwater Quote
I use the 300mm and 135mm with adapter. so far so good iq is fine.
Is it the Fotodiox adapter? Does your camera know what f-stop the lens is set to?
01-15-2016, 04:09 PM   #6
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QuoteOriginally posted by mattb123 Quote
Is it the Fotodiox adapter? Does your camera know what f-stop the lens is set to?


it's a pentax adapter, I was lucky to find. all camera functions work. it's manual focus and the 300mm needs a lens support. my setup works from a tri or monopod.
01-16-2016, 11:40 AM   #7
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QuoteOriginally posted by mattb123 Quote
I just got this lens from Japan pretty cheap and thought I'd give it a try based on MikeSF's results with a similar one.
So, did you get the M* 300 or the older version that used conventional glass?
01-16-2016, 12:03 PM   #8
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QuoteOriginally posted by desertscape Quote
So, did you get the M* 300 or the older version that used conventional glass?
I think it must be the older version. It just says SMC PENTAX 67. Haven't done anything with it besides some test shots so far.
I can see the aperture lever on the adapter move when I change the aperture ring but the camera always shows F--- on the display.

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