It would be very hard to make a homebrewed spot meter as nice as a Pentax, for example, but homebrewed meters in general can be VERY accurate. I made a small series of meters made from cheap handheld digital V-O-M meters which used a photoresistor . I had a chart to convert ohms to shutterspeeds at a couple different apertures and filmspeeds. Kind of clunky, but very accurate, and extremely sensitive. I thought about trying to make a spotmeter but never did. I was stuck on a way to "freeze" the display so that when I took my eye from the peeper, the display would still show what I was looking at. I now have a nice analog Pentax Spotmeter so I can fiddle with other things.
Gene ----- Original Message ----- From: "John Yeo" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, December 20, 2002 6:56 AM Subject: Re: [Cameramakers] Spotmeter > Or, better yet, why not modify a pair of binoculars. Have one side function > as a finder and the other as the meter. That way, you wouldn't have to > worry about metering through a one way mirror that may affect the reading by > polarizing the light. You could put a plane of glass at the location of a > virtual image inside the binocular lens assembly (if there is one) with a > circle on it to show the area being metered. This is also where you would > want to put the display that gives the meter reading. Of course the meter > would not be accurate at close ranges, but you can't expect a homebrew meter > to work just as well as a commercially made one. > > John > > ----- Original Message ----- > From: "Frank Earl" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]> > Sent: Thursday, December 19, 2002 7:53 PM > Subject: [Cameramakers] Spotmeter > > > > Murray, I have a Cambron SP-1. I can't find any > > patent numbers on it, but I would make one suggestion. > > > > The Pentax, Cambron, Minolta, etc. are all shaped like > > guns. I start to get nervous using it sometimes, > > especially with the paranoia going around now. There > > have been stories in the press about the police > > shooting people who have things that look like guns > > but aren't. Make the shape like a small monocular - > > not like a gun. > > > > > > > Message: 1 > > > From: "Uptown Gallery" <[EMAIL PROTECTED]> > > > To: <[EMAIL PROTECTED]> > > > Date: Wed, 18 Dec 2002 21:19:02 -0500 > > > Subject: [Cameramakers] Spotmeter? > > > Reply-To: [EMAIL PROTECTED] > > > > > > Hello: > > > > > > Sorry for duplicating a message on the pinhole list > > > too, but > > > > > > I have an idea for a homebrew spotmeter, but want to > > > read up on 'real ones' > > > first. > > > > > > If any of you own one, I'd appreciate if you'd take > > > a peek on the case and > > > see if there any US Patent numbers so I can start > > > reading. > > > > > > Thanks > > > > > > Murray > > > > > > __________________________________________________ > > Do you Yahoo!? > > Yahoo! Mail Plus - Powerful. Affordable. Sign up now. > > http://mailplus.yahoo.com > > _______________________________________________ > > Cameramakers mailing list > > [EMAIL PROTECTED] > > http://rmp.opusis.com/mailman/listinfo/cameramakers > > _______________________________________________ > Cameramakers mailing list > [EMAIL PROTECTED] > http://rmp.opusis.com/mailman/listinfo/cameramakers > _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
