eos-m dumb adapter question

[Rob Katz]

i'm shooting with my eos-m and a pk/pentax dumb adapter mounted to a pentax 50mm/f2 lens. (no auto exposure/no autofocus/yes exposure)

i am in m/manual mode.

i am shooting at 1/50th. the f/stop is not registered (it's a dumb adapter!) but i'm open at f2.8

the lcd is VERY dark. i can barely see the object i'm shooting in the lcd.

i meter using the exposure compensation scale.

i shoot the shot and the exposure is perfect.

i take the same shot with the 18-55mm kits lens.

i am in p mode.

i meter using the exposure compensation scale.

i am at nearly the same exposure as my first shot.(f2.8 vs f3.5/iso 200 vs 100)

the lcd is a perfect rendering of the shot-nice and bright.

i shoot the shot and the exposure is perfect.

i put the eos-m in green A mode with the same kit lens.

the lcd is bright.

metering is automatic and is the same as the p mode.

i shoot the shot and the exposure is perfect.

three shots. very near same exposure on each.

but the one with the pk dumb adapter has a VERY dark lcd.

what gives?

i apologize in advance if this is a newbie-type question.

any and all thoughts are appreciated.

be well.

rob
smalltalk productions
nyc