Originally posted by matam If you're interested only in AV mode you may remove the aperture lever (if reversible) or don't completly mount the lens and the camera will give you an accurate metering with full manual aperture control. (note that if you stop down to f16 the viewfinder will darker)
yes. the "don't mount all the way" trick works well; it can be made more secure by putting an indent into the lens base so it locks on the camera before the standard position.
Quote: If you need matrix metering and P-TTL short the pin on the body also. (blende8 is the * on the picture)
Easier said than done in my experience - the reason I did the foil mod under the mount ring was I could not find a way to easily & reliably short the * (A) pin on an ad-hoc basis.
After the foil mod under the mount ring, I've found no significant downside to the camera's thinking all my lenses are A type.
Quote: The drawback is that your picture exif will show always f1.2 and you can't select the f-stop on the body.
After speed is set in M mode with green button or whatever, you can change the e-wheel setting of f-stop to what you want recorded in exif.
Quote: Keeping the situation above in mind, if you use a K50 1.2 and put f4 on body and stop down the lens at f4 your picture will'be severly over exposed because the body will read the light that is passing trough the lens at f4 thinking it is fully open.
Yes that's true if you change the body f-stop before you determine the shutter speed.
In practice, you press the green button while the camera thinks the lens is open to a particular f-stop, constant for that lens*; that sets the correct shutter speed for the light intensity coming thru the lens. Later you can change the e-wheel f-stop to whatever you want recorded in exif.
Quote: All of the above can be done easily without arming or modifing the mount on the lens.
"Arming"?
You are correct that it is easy IF you can find an easy way to short the A pin; I could not find an easy way after many attempts.
Dave
*logically f:1.2 should be set on the e-wheel but in practice I find it varies with the particular lens