red card in canon bag's pocket??

[alcavalli]

Can someone tell to me what is the little red card thath I found in my canon IV bag's pocket?
thanks in advance
alberto

 

[richiedcruz]

Try this website http://www.photoethnography.com/equipment.html and look up the info listed for the IVsb

Hope that helps,
Richie

 

[alcavalli]

I've just read but are you sure thath the functions of the card is really for test shutter speed and helps to insert the film?
can someone confirm thath?