Aperture blades on a Bauer 88L

[Maxime de la Tour]

Hi,

I have a Bauer 88L (standard 8) camera, and looking into the lens I found the diaphragm to have a weird shape (I apologise for the image quality) :

Blades open

blades closed

I have seen super 8 cameras with two blades apertures shaped like sickles, but this looks different. Is it broken ? If not, have you seen any other camera with a similar design ?

Sorry if i'ts a newbie question, I'm new to this. Also, there is a switch saying "-2° B", and I can't figure out what it does.

Thanks in advance !

[Maxime de la Tour]

OK it turns out the switch is for a daylight filter (-2° DIN of correction).

[Mark Dunn]

There's nothing unusual about the stop shapes- it's just to ensure that the effective aperture size is always correct when the "sickle" moves across.

These odd protrusions are responsible for the weird lens flare patterns you sometimes see on Super-8.

Edited July 7, 2020 by Mark Dunn

[Maxime de la Tour]

Thanks for the answer. I just found weird that even at full aperture, two "teeth" stayed in the light path. Looking at this post it seems like at f/8 the shape is similar, without the "teeth".

Either way that's interesting, not something you would see in still photography