Tom, That is certainly what I saw on the wall. Big jump from 35mm to 645. Very minor improvement from 645 to 67. Mind you that enlargements were 16 X 20 and perhaps going larger would start to show more difference between 645 and 67.
Bruce Dayton Saturday, January 26, 2002, 3:13:34 PM, you wrote: a> OTOH, I just took the following quote from a> http://people.smu.edu/rmonagha/mf/formats.html. a> It doesn't change my mind, 645 vs. 67, but is still interesting. a> "Quality Factors - 6x4.5 vs. 6x6 vs. 6x7 a> Ernst Wildi in his Medium Format Advantage book notes (on p.28) that a> the a> 6x4.5cm vs. 6x6cm cropped rectangular images printed at 8x10" both a> have to a> be enlarged by a factor of 4.6X. Using a 6x7cm (56mm x 68mm) image, a> the a> rectangle has to be enlarged only 3.8X, a difference of only 20%. By a> comparison, the area of the 6x7cm image is 60% greater than the a> 6x4.5cm a> (or cropped 6x6cm) rectangle. It is the longest side length which a> determines enlargement factors, rather than the relative area of the a> two a> images. This result is counter-intuitive; the much (60%+) larger area a> 6x7cm image only provides circa 20%+ extra enlargement overhead or a> quality. This factor helps explain why there is such a large a> improvement a> in quality in going from 35mm to medium format, but relatively modest a> differences between quality of different medium format sizes." a> Tom C. a> ----- Original Message ----- a> From: "Bruce Dayton" <[EMAIL PROTECTED]> a> To: "Paul Stenquist" <[EMAIL PROTECTED]> a> Sent: Saturday, January 26, 2002 3:48 PM a> Subject: Re[2]: P67II or P645n >> Paul, >> >> While I agree with your statement, at 16 X 20, it was very simple to >> see the difference between 35mm and 645, but not very easy to see the >> difference between 645 and 67. But the weight and handling of the 645 >> were much nicer. I'm not saying that the 67II felt bad or overly >> clumsy, but the 645 didn't feel much more cumbersome than a big 35mm. >> >> >> Bruce a> - a> This message is from the Pentax-Discuss Mail List. To unsubscribe, a> go to http://www.pdml.net and follow the directions. Don't forget to a> 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 .
