Question on Bronica ETRS Lens

[cp_ste.croix]

Well I thought I'd ask this here, as I son't surf any other camera fora. I have a recently acquired Bronica ETRSi and one of the lenses, the zenzanon 150 3.5 MC has this curved star shaped aperature that engages in front of the actual aperature when a photo is taken. It does not change size as the aperature is changed. My question, what is this for, and how does it affect the pictures? I've never seen anything like it. I'm off to maybe get some film for it today so I can experiment, but I thought someone here might know the answer.

 

[kuzano]

The shutter?

The shutter?

sounds like you are talking about the shutter. Look into it as you snap a picture on one of the slow speeds.

Bronica's strong suit in flash photography is that the lens all have the shutter included. No focal plane shutter in the body. This allows flash sync at a broader range of shutter speeds because it is a circular shutter as opposed to aa curtain traveling across the film plane.

ETR's are great camera's and relatively compact compare to other SLR 645's, paricularly because the body has no shutter operating inside.

Good glass as well. Very sharp image quality.

 

[kuzano]

I just thought of something

I just thought of something

Are you saying this set of blades is open and you can see through the lens (light through the lens?)

That sounds odd with the lens off the camera. The lens has a pin on the back that engages the body so that the lever can cock the shutter. The shutter should only open for the duration of the shutter timer.

I can't remember whether the Bronica lenses are cocked or not when off the camera. Did you get the manual. If not, look for a PDF manual on the internet. I would thing butkus (sp) has one downloadable.

HERE is a link to the butkus bronica page of manuals.

http://www.butkus.org/chinon/bronica.htm