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01-20-2013, 01:38 PM   #1
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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
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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
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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
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Thanks

Thanks for the info

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