Hello,

I got this Gossen accessory when I bought my Lunasix F http://www.butkus.org/chinon/flashes...o_f/body38.jpg and I read it can be used to measure the light directly on the focusing screen. I think it needs a compensation of 3 stops. Did someone know about that ? How to use it ? Does it need also a compensation beacause it is used "after" the focusing screen ?