A question about zooming in with C1

[jerseyinHK]

A question....

If I shoot at 50mm and zoom in 100% in C1, would that be roughly equivalent to 100mm? How far to zoom in to get to a 300mm equivalency? Does someone have a formula, or a conversion chart?

Asking as I have a photo that there is a specific area of interest, and I can only physically get to one location. I am trying to determine which lens (I mostly have primes) to carry.

I understand the FOV, however can this be worked backwards to determine an equivalent focal length from a section of photo?

 

[Rob de Loe]

A question....

If I shoot at 50mm and zoom in 100% in C1, would that be roughly equivalent to 100mm? How far to zoom in to get to a 300mm equivalency? Does someone have a formula, or a conversion chart?
Asking as I have a photo that there is a specific area of interest, and I can only physically get to one location. I am trying to determine which lens (I mostly have primes) to carry.

I understand the FOV, however can this be worked backwards to determine an equivalent focal length from a section of photo?

When you choose "100%" view in your software, it has nothing to do with focal length. It means 1 pixel in the file is represented with one pixel on your monitor.

Your solution is actually quite simple. Let's say you're using a GFX 100 camera with 11,648 pixels on the long edge. If you want to crop to the dimensions of a 100mm lens, then crop to a long edge of half that, or 5,824 pixels (50/100 = 0.5). For your crop to the equivalent field of view of a 300mm lens, crop to 50/300 = 0.166 times the long edge (so 11,648 * 0.166).

 

[jerseyinHK]

Thank you Rob...that is a helpful way to look at it.

 

[Rob de Loe]

Thank you Rob...that is a helpful way to look at it.

I find that's a lot easier than trying to work out exactly how many pixels are being shown in the area in LR that has the image at 100%.

 

[Greg7579]

A question....

If I shoot at 50mm and zoom in 100% in C1, would that be roughly equivalent to 100mm? How far to zoom in to get to a 300mm equivalency? Does someone have a formula, or a conversion chart?
Asking as I have a photo that there is a specific area of interest, and I can only physically get to one location. I am trying to determine which lens (I mostly have primes) to carry.

I understand the FOV, however can this be worked backwards to determine an equivalent focal length from a section of photo?

Rob explained it well. 100%, or 1:1, is displaying the file at full resolution. This is a very important concept to have a full understanding of in dodigital photograhy. You need to study it a bit and read a few articles about it.

At full res, a MF (GFX or new Hassy) raw file is very large full res, so when you view it at full res in C1 or LR, it will no fit on your screen - even if you have a 6K monitor like me (but more of it does).

Full res is my favorite GFX shooting term because looking at my files at full res displays some real wonders of the universe.

When your MF file fits on your screen, it is being downsized.

And for you monitor deniers out there who might be reading this, let me tell you a fundamental truth. When I fill my 6K monitor with a GFX file with "fit" (which is downsized) it looks far better than when I do so on my 4K monitor. The difference would shock you and makes me even happier that a shot GFX 5 years ago because I was futureproofing, which is one of the huge advantages MF has over the much smaller sensors of FF cameras.