|
Forum: Pentax Lens Articles
07-23-2014, 11:27 PM
|
| |
Well, I've read through all 14 pages of this thread and I am now more confused than when I started. "M" lenses either will or won't meter properly because they either will or won't stop down when the green button is pressed depending on (or regardless of) the manual clutch setting...and it all depends on which K camera you own.
I have a K-5IIs with fully updated firmware. Can anyone definitively comment, through personal experience, on the following?
Let's assume I have already set my camera to enable shooting with the aperture not set to "A" (which would include all lenses with an aperture ring), programmed the green button per the OP, and set the metering mode to "manual".
1. With a screw-mount lens having a manual clutch, I need to use it to stop down the lens and then press the green button for the camera to set the proper shutter speed for the manually set aperture. I must keep the aperture stopped down when I shoot because the camera, through the adapter, has no ability to stop down the lens automatically.
2. With an "M"-style K-mount (or an "A"-style K-mount) set to a specific aperture value (using the aperture ring on the lens), I may meter using the green button to get the camera to set the proper shutter speed. However, as this is a K-mount, the lens will be stopped down automatically to the set aperture both when I meter and then, again, when I shoot. (I tried this earlier today and it appears to work.) (see Using Older Lenses on the PENTAX K-5 II and K-5 IIs | Ricoh Imaging Support)
3. Apparently, some "auto" M42 lenses that do not have a manual clutch require a modification to the pin assembly in order to permit the lens to stop down at all once it's mounted to the camera. (see this).
Do I have the above summarized correctly? Assistance is welcomed.
Thanks,
Barry
|
