Fantastic!!! Thanks a lot!!! I think I'll give it a try with TTL cameras first.
Cheers Guys!!! Andy -----Original Message----- From: John Coyle [mailto:[EMAIL PROTECTED] Sent: Sunday, January 04, 2004 10:00 AM To: [EMAIL PROTECTED] Subject: Re: Extension tube K Andy, the basic formula for calculating the additional exposure required is given in this table (taken from "The Asahi Pentax Guide", Focal Press 1967): Tube No Magnification Exposure factor 1.....................0.35................x1.8 2.....................0.52................x2.3 3.....................0.69................x2.9 1+3.................0.86................x3.5 2+3.................1.04................x4.1 the assumption is you are using a 55mm lens focussed at 18in. The factors may vary slightly for the K tubes, but this may get you going in the right direction! . John Coyle Brisbane, Australia ----- Original Message ----- From: "Andy Chang" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Saturday, January 03, 2004 11:12 PM Subject: Extension tube K > Hi guys, > > A belated Happy holiday to you all!!! > > I have just acquired a Pentax Extension Tube set K. I had no idea what > it does first but after looking at Boz's web site, I have some idea how > it works. It was a bargain and I couldn't resist bidding for it. > > According to Boz's site, it is a manual extension tube set and I guess > the differences between the Auto set and the manual set is about the A > position on the A and later lenses. > > If you remember, I have asked about losing F stops using teleconverter. > I'm just wondering if it also applies on the extension tubes. By adding > extension tubes behind the lens, do I have to adjust the exposure > accordingly? > > Thanks > > Andy > > > >
