Funny that's what the Spotmatic F metering circuit was supposedly designed to do. If you don't trust it you don't have to use 1.5 volt power supplies in your Spot F, use Wein cells or buy one of these $30.00 adapters. I'm sure that the respective manufacturers will appreciate the business. However from my perspective it seems like a waste of money that I could spend on film and processing, or for that matter beer, since in the Spotmatic F those solutions aren't necessary. I make no claims for other equipment that use mercury cells.
At 10:26 AM 8/9/2002 -0500, you wrote: >I wouldn't bet on that, most analog meters were not completely >linear devices and could use a bit of recalibration after a >change in operating voltage. If we used higher voltage and >regulated the voltage down to the desired level, I'd be willing >to trust it. But early metering circuits seldom, if ever, >included a zener diode for regulation, or over-voltage >protection, simply because they specified the exact voltage >source, battery, to use and designed the circuit to operate with >that source. It wasn't until quite a bit later that the >electronics were small enough to fit into the camera and a >greater range of robustness was achieved. > >Len >--- > >----- Original Message ----- >From: "Rob Studdert" <[EMAIL PROTECTED]> >To: <[EMAIL PROTECTED]> >Sent: Friday, August 09, 2002 9:43 AM >Subject: Re: ebay caveat (Battery Substitutes) > > > > On 9 Aug 2002 at 5:24, Keith Whaley wrote: > > > > > Peter Alling wrote: > > > > > > > > Actually it seems very steep since the camera will handle >the extra > > > > voltage, > > > > > > Some cameras, not necessarily all. As I understand it, the >bridge > > > circuit in the Spotmatic F (or is it all Spotmatics?) will >allow that, > > > but why trust and stress the electronics? Isn't it better to >hand the > > > camera a voltage as close to which it's been designed, if >you can? > > > > The slightly higher voltage will place no significant stress >on what is a > > pretty robust circuit and componentry. > > > > Cheers, > > > > Rob Studdert > > HURSTVILLE AUSTRALIA > > Tel +61-2-9554-4110 > > UTC(GMT) +10 Hours > > [EMAIL PROTECTED] > > http://members.ozemail.com.au/~distudio/publications.html > > - > > This message is from the Pentax-Discuss Mail List. To >unsubscribe, > > go to http://www.pdml.net and follow the directions. Don't >forget to > > visit the Pentax Users' Gallery at http://pug.komkon.org . >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
