Perhaps OP ? is actually
Are 4X5 and 5X4 the same
They are, but typically the ratio IS reversed to show EU and USA sourcing
3X4 nominal is different and usually shorthand for 3-1/4 X 4-1/4. 'Nominal' usage is very confusing. I hate the word often used by engineers to sound like they know something we don't. I used to teach engineers real world applications.
https://www.lexico.com/en/definition/nominal
Tin Can
Fortunately you got the best answer right off the bat.
Taking into consideration the film's rebate is not needed in this instance. A bigger challenge, but not difficult, will be matching up the view of the DSLR with the lens of the view camera. Do DSLRs viewfinders 'see' 100% of what goes hits the sensor...or is it less as in the film SLRs? (Which also changed with brand/model of SLRs)
Last edited by Vaughn; 10-Oct-2019 at 12:12.
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
You might find these two brief articles helpful:
I didn’t say it wasn’t the right answer, I said it was unhelpful. It assumed the answer was obvious, the very fact I asked the question illustrated it wasn’t obvious to me, so the answer was dumb, as dumb as replying ’duh’ in a post. What is this obsession with ’duh’? It’s not actually a word, it merely illustrates ignorance, as does referring to 10x8 as 8x10 as this post has illustrated.
The basic and fundamental purpose of forums is supposed to be the sharing of knowledge, the original response to my question had none of that, it illustrated ignorance alone.
Perhaps you can explain why you didn't think 4x5 or 8x10 film had an aspect ratio of 4:5. That continues to be fairly obvious unless one wants to really split hairs about a couple extra millimeters from the film holder blockage. And I doubt many would say the aspect ratio was 23:30 or something like that.
PS: I didn't say 'duh.'
And it goes both ways -- one who asks the question has to be willing to take the answers graciously...a difficult task at times. But your question asks about ratios, you seemed to have had some understanding of ratios from the way you asked the question, but the question itself belied that assumed knowledge. That led to a unsatisfactory answer for you. A more straight forward answer would have been, "4:5 is the ratio of the film's format and that is what you should set on your computer/camera/whatever." But that answer was heavily implied by the answer you received and the poster was hoping to point you in that direction, rather than lead you by the nose.
Have you thought about getting the lens of the DSLR to match the 4x5's lens yet? I suppose a side-by-side comparison would be the quick and easy way to go, with a zoom lens on the DSLR camera making it even easier.
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
Yes, thank you Vaughn.
Regarding the DSLR lens - if one wants the same view, divide the ~96mm short end of 4x5 by the 24mm short end of the DSLR sensor (that's on full-frame, if APS-C then 16mm) and then divide your 4x5 lens of choice by that number to get your equivalent focal length.
So if you have a 150mm lens on your 4x5, divide that by [96/24] to get 37.5mm (or 25mm if on APS-C). So roughly a 35mm lens on full-frame or 24mm lens on APS-C would be the same once set to 4:5.
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