Implications of not having independant Iris/shutter control?? at DVinfo.net

James Millward · August 24th, 2007, 09:28 AM

Hey guys, Im a complete novice looking for a camera.

The cams Im looking at have some degree of manual control, BUT dont have independance between Iris and shutter speed.

So I can set the shutter speed, and the gain/iris will be automatically added, OR I can set the iris, and the shutter will be adjusted.

Can someone explain the implicationsof this to me please? I have built a 35mm dof device, so I need to able to lock the iris and prevent it opening too far, BUT what will this mean if I cant adjust my shutter??

If the image is too dark (or the camera thinks it is) and I have locked the iris, wont it reduce the shutter speed??

Mnay thanks
Jim
tbip2001

Marcus Marchesseault · August 27th, 2007, 05:30 AM

It will only reduce the shutter to a certain speed. Since you live in PAL land, it will default down to 1/50 shutter which looks fine. Regardless, not having manual control of the exposure will be very challenging when using a 35mm adapter.

August 24th, 2007, 09:28 AM	#1
James Millward Regular Crew Join Date: Jul 2007 Location: England Posts: 53	Implications of not having independant Iris/shutter control?? Hey guys, Im a complete novice looking for a camera. The cams Im looking at have some degree of manual control, BUT dont have independance between Iris and shutter speed. So I can set the shutter speed, and the gain/iris will be automatically added, OR I can set the iris, and the shutter will be adjusted. Can someone explain the implicationsof this to me please? I have built a 35mm dof device, so I need to able to lock the iris and prevent it opening too far, BUT what will this mean if I cant adjust my shutter?? If the image is too dark (or the camera thinks it is) and I have locked the iris, wont it reduce the shutter speed?? Mnay thanks Jim tbip2001

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August 27th, 2007, 05:30 AM	#2
Marcus Marchesseault Trustee Join Date: Nov 2005 Location: Honolulu, HI Posts: 1,961	It will only reduce the shutter to a certain speed. Since you live in PAL land, it will default down to 1/50 shutter which looks fine. Regardless, not having manual control of the exposure will be very challenging when using a 35mm adapter.