Use of meter on focus screeen to effect TTL exposure at all??

[brit]

I have a Mamiya 645 and cannot, as yet, afford a metered prism. But

is there an ad hoc way around this?

 

I have a Sekonic lightmeter that can be used as reflected light

meter. With the WLF removed I can get close access to the focus

screen. It will be possible to meter from the focusing screen but

what success/consistency have any of you had with this route?

 

I only really want to use this to perhaps try to spotmeter a skyscape

and to take account of polariser filters which have a variable

working filter factor. Traditionally using a manual TLR, polariser

and meter in the usual sense I have always exposed skyscapes poorly.

 

Bri.

[Rob F.]

Brian, I think it would be important to shield the meter and groundglass against stray light. Otherwise, I don't know why it wouldn't work. It would just take a few rolls to calibrate. Is there such a thing as a meter with a separate groundglass probe that seals right against the groundglass? If there isn't, there oughtta be! I think it's a great idea. Keep us posted.

 

Regards,