simplified notations

stonebat

stonebat

Veteran
Can we start using more simplified notations?

"50mm" implies 50mm in m43 format.
"50mm/35" implies 50mm equivalent in 35mm format.

"50mm/2.6x" implies 50mm equivalent in m43 format after 2.6x 1:1 cropping.
"50mm/2.6x/35" implies 50mm equivalent in 35mm format after 2.6x 1:1 cropping.
 
Why don't we just use the focal lengths and know what format we're talking about. Someone posts 50mm in this forum I can visualize it, in 7D forum I can visualize it, in 5D forum I can visualize it...it's not that big a deal.
 
"50mm/2.6/35/M626/75mph/I45/M" implies a 50mm equivalent in 35mm format after 2.6x 1:1 cropping, mounted to the hood of my Mazda 626, going 75mph down Interstate 45 on a Monday.

Seriously, though, there are just so many things wrong with that post, I wouldn't guess where to start.

A 50mm lens is a 50mm lens no matter what camera you put it on, no matter what country you're in, no matter what planet you're on. ;)

Out of curiosity, which Micro4/3 lens would you describe as the "50mm/2.6x - implies 50mm equivalent in m43 format after 2.6x 1:1 cropping"? j/k
 
I think these two are good notations.
1. "50mm" implies 50mm in m43 format.
2. "50mm/35" implies 50mm equivalent in 35mm format.

The other two notations... let me tweak a bit.
3. "50mm/2.6x" implies 50mm in m43 format & 2.6x 1:1 cropping applied. i.e. it's equivalent to 130mm in m43 format.
4. "50mm/35/2.6x" implies 50mm equivalent in 35mm format & 2.6x 1:1 cropping applied.

Seriously... wouldn't it be much easier to say, "that particular scene was taken in 50mm/2.6x"? That tells the scene was taken with 50mm lens and 2.6x 1:1 cropping.
 
usage: the scene was taken in ???.

e.g.
pancake -> 20mm in m43
pancake/2.6x -> 56mm in m43
pancake/3.9x -> 78mm in m43

e.g.
50mm -> 50mm in m43
50mm/2.6x -> 130mm in m43
50mm/3.9x -> 190mm in m43

e.g.
28mm/35 -> 28mm in 35mm
28mm/35/2.6x -> 28 * 2.6 mm in 35mm
28mm/35/3.9x -> 28 * 3.9 mm in 35mm
 
Some primes have popular f-number. So it can be simplified, too.

50.4mm -> 50mm f/1.4
50.8mm -> 50mm f/1.8
20.7mm -> 20mm Panny pancake f/1.7
17.8mm -> 17mm Oly pancake f/2.8
14.5mm -> 14mm Panny pancake f/2.5
 
stonebat said:
I think these two are good notations.
1. "50mm" implies 50mm in m43 format.
2. "50mm/35" implies 50mm equivalent in 35mm format.
Click to expand...

This alone makes no sense to me. 50mm in m43 format? That doesn't mean anything. 50mm is 50mm is 50mm. Are you saying a 50mm lens on m4/3rds? Ok so that's 100mm/35 by your notation or is it 25mm/35 by your notation? Very unclear. Here's the easy way to say this: I put a 50mm lens on my m4/3rds camera. The end. Everyone should know that means it's a 100mm FOV vs a 35mm full frame still camera.
 
I'm not sure what is accomplished with this proposed notation.

If I shot 1080 footage with a 20 mil pancake on GH2 wide open with extra-teleconversion 'ON' I would simply state,
20mm/f1.7,ETCx2.6. That's all anything needs to know about the lenses and focal multipliers used.
 
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