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35mm lens equivalent of 4x5 shot on medium format??
Old 05-27-2019   #1
Kieran_Keeton
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35mm lens equivalent of 4x5 shot on medium format??

What is the 35mm lens equivalent of a 90mm 4x5 lens, used on a 4x5 with a 6x7 roll film adapter? I am trying to pre-judge compositions but I just don't know what focal length I am working with.
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Old 05-27-2019   #2
CharlesDAMorgan
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90mm 4x5 is c30mm in 35 mm format. On a 6x6 that would be about 60mm, so about 65mm in 6x7?
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Old 05-27-2019   #3
Nokton48
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I would use my 28mm PC Nikkor also switching to 90mm on 4x5. Very close.
Part of my duty was to provide for Architects 35mm slides as well as large format with similar views.


The 28mm PC Nikkor IS an awesome lens.
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Old 05-27-2019   #4
ka7197
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Quote:
Originally Posted by Kieran_Keeton View Post
... but I just don't know what focal length I am working with.
You are working with 90 mm. On 6 × 7 cm format, that's a standard focal length.
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Old 05-27-2019   #5
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65mm will be about perfect.

The 65 Angulon is pretty darn affordable.

No need to think twice.
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Old 05-27-2019   #6
retinax
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OP, people are understanding your question in two different ways. Are you looking for a lens to use on 135 or for one to use on 6x7? To me it sounds like you want to know the closest in 135 to a 90 on 6x7. And that's a 50. It's not hard to calculate yourself: the ratio of the long side of the frame (or short or diagonal if that's more important) to focal length is about the same: 70:90 and 36:50 mm.
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Old 05-27-2019   #7
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Quote:
Originally Posted by Kieran_Keeton View Post
What is the 35mm lens equivalent of a 90mm 4x5 lens, used on a 4x5 with a 6x7 roll film adapter? I am trying to pre-judge compositions but I just don't know what focal length I am working with.
A 90mm on 6x7 format is roughly equivalent to a 40-45mm on 135 format.
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Old 05-27-2019   #8
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Quote:
Originally Posted by Kieran_Keeton View Post
What is the 35mm lens equivalent of a 90mm 4x5 lens, used on a 4x5 with a 6x7 roll film adapter?
A 90mm lens on a 4x5 inch camera with a 6x7 roll film adapter produces a 6x7cm image with a 52.35 diagonal angle-of-view.

A 44mm lens an a 35mm camera produces a 24x36mm image with a 52.36 diagonal angle-of-view.
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Old 05-27-2019   #9
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Quote:
Originally Posted by retinax View Post
OP, people are understanding your question in two different ways. Are you looking for a lens to use on 135 or for one to use on 6x7? To me it sounds like you want to know the closest in 135 to a 90 on 6x7. And that's a 50. It's not hard to calculate yourself: the ratio of the long side of the frame (or short or diagonal if that's more important) to focal length is about the same: 70:90 and 36:50 mm.
I think I'm reading it as he has a 90mm on a 4x5 with a 6x7cm back, and wants to know the equivalent on 135. So in reality he's asking what the equivalent of a 90 on 6x7 is, really, no need to even think about the 4x5 coverage. So I'd agree with you.

Seems to make logical sense for me: an 80mm on my Bronica SQ is about as close to a 50mm on 135.
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