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11-06-2014, 01:30 PM   #1
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m42 for wide open metering

Does anyone know if this type of m42 mount lens used with a K mount adapter on a DSLR will work on the AV setting? In other words will this mount eliminate the use of the Green Button?

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11-06-2014, 01:41 PM   #2
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Open-aperture metering isn't supported on K-mount cameras, but if you set the diaphragm to manual you'll be able to use Av mode.

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11-06-2014, 01:54 PM   #3
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Thanks Adam
11-06-2014, 03:55 PM   #4
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Take care with this lens to not attempt to operate the A/M switch unless the lens is mounted on a camera, has a wide-flange rear cap attached or has the M42 adapter mounted. Something has to depress the tiny silver pin at lower right before the A/M switch can be moved.


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11-06-2014, 04:44 PM   #5
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There is no A/M switch on this lens? So, the tiny pin on the base of the lens acts as A/M switch?
11-06-2014, 05:52 PM   #6
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Yes, there is an A/M switch. They all have a switch regardless of wide open metering.

I am planning on buying a 200mm with the hopes that this style I will be able to utilize the wide open metering like it was an M lens. Your thoughts.
11-06-2014, 05:59 PM   #7
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QuoteOriginally posted by Rimfiredude Quote
Yes, there is an A/M switch. They all have a switch regardless of wide open metering.

I am planning on buying a 200mm with the hopes that this style I will be able to utilize the wide open metering like it was an M lens. Your thoughts.
I don't think I get it... you said wide-open metering... meaning that the metering is taken when the aperture is at the widest..... so does that mean you plan to use this lens only when it is at wide-open aperture? Not even stopped down to say f4 (assuming that it is wider than f4).

Why is Av mode not better than M mode? I am lost.....
or do you mean you want to manual focus when the lens is at its brightest aperture?
11-06-2014, 07:25 PM   #8
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Sometimes I don't explain what I am thinking correctly.

I am hoping with this kind of lens, it will work just like using an M lens.
Using Manual mode, focus at widest aperture...hit the green button to make a stopped down meter reading and take the shot.

11-09-2014, 03:18 AM   #9
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QuoteOriginally posted by Rimfiredude Quote
hit the green button to make a stopped down meter reading and take the shot
Did it work that way?
11-09-2014, 07:29 AM   #10
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Welcome to PF. I'm not sure about that lens but I don't usually have to use the green button on my M42 pentax lenses. Do you know what brand of lens that is?
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