Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-20-2013, 01:38 PM   #1
Junior Member




Join Date: May 2011
Location: Central Florida
Posts: 38
6x7 to 645 focal length conversion?

Hi
I posted this earlier and if it takes a little longer to show I apologize for posting twice. I want to know how to compare the focal lengths of 6X7 lenses to 645D lenses. I have been thinking of buying the 6x7 to 645 conversion adapter to use on a 645D camera and want to know how the 6x7 lens will perform on the 645 camera.

Thanks in advance
elsdad

01-20-2013, 02:31 PM - 1 Like   #2
Site Supporter
Site Supporter




Join Date: Mar 2007
Location: Christchurch, New Zealand
Photos: Gallery
Posts: 1,432
QuoteOriginally posted by elsdad Quote
Hi
I posted this earlier and if it takes a little longer to show I apologize for posting twice. I want to know how to compare the focal lengths of 6X7 lenses to 645D lenses. I have been thinking of buying the 6x7 to 645 conversion adapter to use on a 645D camera and want to know how the 6x7 lens will perform on the 645 camera.

Thanks in advance
elsdad
The crop from 67 to 645D is about 1.5. A 300mm 67 lens will have the same field of view as a 200mm lens on a 645D camera.

Similarly,

The crop from 67 to 645 is about 1.25. A 150mm 67 lens will have the same field of view as a 120mm lens on a 645 camera.

I hop that this helps.

Regards

Chris Stone
01-20-2013, 03:10 PM   #3
Ole
Administrator
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
Photos: Gallery | Albums
Posts: 4,407
QuoteOriginally posted by elsdad Quote
Hi
I posted this earlier and if it takes a little longer to show I apologize for posting twice. I want to know how to compare the focal lengths of 6X7 lenses to 645D lenses. I have been thinking of buying the 6x7 to 645 conversion adapter to use on a 645D camera and want to know how the 6x7 lens will perform on the 645 camera.

Thanks in advance
elsdad
A while back I created this table comparing focal lengths, maybe that could shed some light on things!

https://www.pentaxforums.com/forums/pentax-lens-articles/93714-field-view-tab...d-645-6x7.html
01-20-2013, 07:13 PM   #4
Junior Member




Join Date: May 2011
Location: Central Florida
Posts: 38
Original Poster
Thanks

Thanks for the info

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
645d, camera, lenses, medium format
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
What is Focal Length of Fotodiox Q to K adapter? SonDa5 Pentax Q 4 12-25-2012 03:11 PM
What to set for SR focal length when using TC? klh Troubleshooting and Beginner Help 7 06-17-2011 03:19 PM
Portrait distance in relation to focal length HoBykoYan Pentax SLR Lens Discussion 13 03-29-2011 12:44 PM
Focal length conversion JJD2500 Pentax DSLR Discussion 13 03-01-2011 05:30 PM
SLR > DSLR focal length conversion? wedge Pentax SLR Lens Discussion 20 07-28-2009 05:05 AM



All times are GMT -7. The time now is 02:32 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top