I'm setting up my mural printing and need to know minimum distances for each lense to enlarge to a specific size . Had it in a book somewhere and lost it .

Thanks

-- RICK HEMMINGS (POINTLIGHT@AOL.COM), October 12, 2001

Answers

Read the old thread "Maximum Size Enlargement Possible (Dick Drake)" from a couple weeks ago and you'll have a couple ways of doing it.

-- Conrad Hoffman (choffman@rpa.net), October 12, 2001.

D = (F+F/M)*(M+1). For big magnifications of 10 times or more, the formula can be approximated to D = F*(M+1).
D = negative to paper distance.
M = magnification.
F = lens focal length.

-- Pete Andrews (p.l.andrews@bham.ac.uk), October 15, 2001.

Pete, am I correct to assume that the negative to paper distance is given in the same measurement as focal length? IE: in mm when using a 50mm lens. Right?

-- Johnny Motown (johnny.motown@att.net), October 15, 2001.

".....am I correct to assume that the negative to paper distance is given in the same measurement as focal length?"
- Of course. You can't multiply rashers of bacon to get kippers.

-- Pete Andrews (p.l.andrews@bham.ac.uk), October 16, 2001.

> Of course. You can't multiply rashers of bacon to get kippers. > It may depend upon your level of standards for kippers. If you have low standards, it might pass as a compromise!

Thanks for your real answer, Pete. I just could not pass up an opportunity to respond to your comment! ;-)

Johnny

-- Johnny Motown (johnny.motown@att.net), October 16, 2001.

Johnny: Sorry about the sarcasm. That's my old Maths teacher speaking through me. He was always making ridiculous comparisons like that, but it got his point over quite stingingly at times.

-- Pete Andrews (p.l.andrews@bham.ac.uk), October 18, 2001.

Pete,

No need to apologize. I enjoyed the analogy! Your answers are always welcomed! :-)

-- Johnny Motown (johnny.motown@att.net), October 18, 2001.