About aperture and shutter.

[Sid836]

Are there any samples that demonstrate the effect of shutter acting as aperture at the same time vs aperture being/acting separate from the shutter?
What could be the best conditions to exaggerate any possible differences to the effect of it?

 

[rivercityrocker]

I'm not sure I get what you're asking. Are you referring to a leaf shutter system? Because a leaf shutter looks like an aperture diaphragm and operates in a similar manner, but it's still just a shutter and there is an aperture diaphragm behind it.

 

[bsdunek]

There is a patent for a combined shutter/aperature control - This was by Kodak -
http://www.google.com/patents/EP0619510B1?cl=en
I can't find if any cameras were made using this system. It seems logical in that it would simplify the mechanical parts. On the other hand, it may not be worth it, as the control system would be more complex.
Anyone know of any cameras that use this?

 

[btgc]

I think many film P&S cameras work this way, especially those with one fixed speed - open shutter to certain degree, making rhombus shaped opening which works like aperture.

 

[Sid836]

Cameras like Lubitel have a leaf shutter that opens for the set amount of time at the set aperture value.
In these cameras the shutter is the aperture at the same time. How could that affect the image quality with regards to other cameras that have a shutter well behind the aperture?
I haven't had yet the chance to try it with my newly acquired lubitel (still waiting for that damn film in the mail).

 

[Greyscale]

Konica C35 and Minolta Hi-Matic E and F all use the shutter to form the aperture.

 

[btgc]

This is not from Lubitel and aperture is separate from shutter but shape of opening is very far from round on 10-blade apertures.


Sugar glaze by mm35exp36, on Flickr

 

[rivercityrocker]

Cameras like Lubitel have a leaf shutter that opens for the set amount of time at the set aperture value.
In these cameras the shutter is the aperture at the same time. How could that affect the image quality with regards to other cameras that have a shutter well behind the aperture?
I haven't had yet the chance to try it with my newly acquired lubitel (still waiting for that damn film in the mail).

I used to have a Lubitel 166. I never really inspected it to see the shutter/aperture assembly, but you could be right.

In any case, obviously this is a cheap manufacturing method and the IQ wouldn't be nearly as good as your normal system. This may explain the soft corners and weird looking out of focus areas which will be effects caused by odd shapes of the openings which will likely change depending on the aperture size.

Basically these types of cameras have odd signatures, which is why some people like them.