Actually there are three conversion factors needed because the two formats Do not have the same aspect ratio:
Diagonal = 89.6mm/43.25mm = 2.07X, 35mm to P67 ( 0.483X, P67 to 35mm ) Long side = 70mm/36mm = 1.94X, 35mm to P67 ( 0.515X, P67 to 35mm ) Short side = 56mm/24mm = 2.33X, 35mm to P67 ( 0.429X, P67 to 35mm ) There you have it. jco -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jens Bladt Sent: Wednesday, October 18, 2006 3:11 PM To: Pentax-Discuss Mail List Subject: RE: 35mm equivalent focal length on P6x7 As I stated before, there's a 2.1 factor involved here. 75mm/2.1 = 35,7 mm: http://www.jensbladt.dk/Images/Focal-length-multiplier-web.jpg Regards Jens Bladt http://www.jensbladt.dk +45 56 63 77 11 +45 23 43 85 77 Skype: jensbladt248 -----Oprindelig meddelelse----- Fra: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] vegne af J and K Messervy Sendt: 17. oktober 2006 12:49 Til: Pentax-Discuss Mail List Emne: Re: 35mm equivalent focal length on P6x7 Hi Paul I'm considering a 75mm 4.5 as it is affordable. Why do you say it isn't highly regarded? Thanks James ----- Original Message ----- From: "Paul Stenquist" <[EMAIL PROTECTED]> To: "Pentax-Discuss Mail List" <[email protected]> Sent: Tuesday, October 10, 2006 8:05 PM Subject: Re: 35mm equivalent focal length on P6x7 > Better bets for wide 6x7 lenses are the 55/4 and the 45/4. Look for the > latest version of the 55/4 if you go that way. It has the typography on > the tapered end of the focusing ring. These lenses offer a field of > view similar to a 28 and 23 respectively. Excellent glass. The 75/4.5 > is not highly regarded. There is a newer 75/2.8 that is superb, but > it's still pricey and hard to find used. > Paul > On Oct 9, 2006, at 11:25 PM, Bob Sullivan wrote: > >> Conversion factor for 6x7 lenses to 35mm is 1/2X. >> That is the 165mm 6x7 lens looks like a 82.5mm lens in 35mm. >> I like the 165/2.8 but it is really a short telephoto. >> Try the 75/4.5 lens for a 37.5mm equivalent wide in 35mm. >> It's not too expensive. >> Regards, Bob S. >> >> On 10/9/06, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: >>> Hi all >>> >>> I may be on the verge of purchasing a 6x7 body and I'm wondering what >>> the >>> conversion is for focal lengths since I'm used to thinking in 35mm >>> focal lengths. >>> >>> I won't really have much of a budget for lenses, etc so I'll have to >>> start with only >>> one. Considering what I plan to mostly use the body for, I want a >>> wide angle. Can >>> someone please suggest a good wide angle for the 6x7 for landscapes? >>> Preferably >>> one that's fairly readily available used and not too expensive. :) >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.4/477 - Release Date: 10/16/2006 -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.408 / Virus Database: 268.13.5/482 - Release Date: 10/18/2006 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
