Comparing my new VX2100 to my PD170

Dave Largent · July 14th, 2004, 10:24 AM

Tom, what are you saying can't happen? Say I'm in all auto mode. So are you saying that if I were in a dark room, with the custom preset to limit gain to 12 dB, and the iris is at maximum open, that if the room got brighter, that the iris would not close down *before* the gain would be reduced? You're saying that
if the room got brighter, that the gain would always move *prior to* the iris?

Glen Elliott · July 14th, 2004, 11:23 AM

I believe that is what he/we are saying. Say if your in all auto, in a dark room which requires the iris to be completly open and a gain of +12. Now the room gets brighter and the camera adjusts to the extra light. If you immediatly turn off auto exposure- and go inspect what setting it was currently on when in auto mode it's technically impossible for there to be gain without the iris maxed out at it's widest aperature. The gain settings only begin AFTER "open" is selected.

If the camera does, indeed, do what your saying there should be a marked SHIFT in exposure as soon as you unlock the auto exposure....beings it's snapping from a stopped down iris WITH gain....*something impossible to achieve with manual settings.

Dave Largent · July 14th, 2004, 01:13 PM

Well, Glen, that might be an interesting test. Perhaps
I'll try it and get back with what I find.

July 14th, 2004, 10:24 AM	#16
Dave Largent Trustee Join Date: Aug 2003 Posts: 1,483	Tom, what are you saying can't happen? Say I'm in all auto mode. So are you saying that if I were in a dark room, with the custom preset to limit gain to 12 dB, and the iris is at maximum open, that if the room got brighter, that the iris would not close down before the gain would be reduced? You're saying that if the room got brighter, that the gain would always move prior to the iris?

July 14th, 2004, 11:23 AM	#17
Glen Elliott Wrangler Join Date: Apr 2003 Location: Philadelphia, PA Posts: 2,898	I believe that is what he/we are saying. Say if your in all auto, in a dark room which requires the iris to be completly open and a gain of +12. Now the room gets brighter and the camera adjusts to the extra light. If you immediatly turn off auto exposure- and go inspect what setting it was currently on when in auto mode it's technically impossible for there to be gain without the iris maxed out at it's widest aperature. The gain settings only begin AFTER "open" is selected. If the camera does, indeed, do what your saying there should be a marked SHIFT in exposure as soon as you unlock the auto exposure....beings it's snapping from a stopped down iris WITH gain....*something impossible to achieve with manual settings.

July 14th, 2004, 01:13 PM	#18
Dave Largent Trustee Join Date: Aug 2003 Posts: 1,483	Well, Glen, that might be an interesting test. Perhaps I'll try it and get back with what I find.