Confused - EF-S & 1.6 APS-C Sensor

FatDaddy

FatDaddy

Veteran
Just trying to get this straight. EF-S lenses are made for APS-C sensors (1.6). They will not work at all on full frame (5D M2). Does the focal length still get the 1.6 multiplication on a EF-S lens? Meaning the kit lens is 28-135 (off the top of my head). It has the focal range of a 45 - 216 with the APS-C sensor? The EF-S 17-55 2.8 is really a 27 - 88. Just want to make sure because I am multiplying lenses by 1.6 no matter if they are EF-S, EF or L series.

Thanks :beer:
 
You don't need to worry about multiplying focal lengths--that's not how it works. A 50mm is still a 50mm--the field of view changes as a smaller sensor "crops" the image. My advice is to stop thinking about cropping, and instead get used to the field of view that different lenses give you on your camera. For example, from directing I'm very used to how a given focal length looks on a 35mm film camera. I don't really care that it's different on a full-frame camera.

I hope that helps--
 
That's not really what he was asking though.

To put it simply, he was asking if a 50mm EF-S lens is a 50mm FF equivalent, with all the same FOV properties.

From what I can gather, the answer is no. The EF-S lenses are still subject to the same FOV crop that comes with having a smaller sensor.
 
I thought that a lens built for the aps-c sensor would equal the fov of its ff counterpart. So a 50mm EF-S lens on an aps-c sensor would have the same fov as a 50mm normal lens on a fullframe camera.
 
>So a 50mm EF-S lens on an aps-c sensor would have the same fov as a 50mm normal lens on a fullframe camera.

Don't think so. 50mm is 50mm whatever the lens is. But EF-S have the following properties:

- On work on APS-C 1.6x cameras
- Also designed often to have shorter focal length to allow equivalent filed of view.

Take the new Canon kit lens EF-S 15-85 mm f/3.5-5.6 IS USM

it allows field of view of about 24-135mm. If it would be the field of view of 15mm it would be a ulter WA lens.
 
Fluke said:
..he was asking if a 50mm EF-S lens is a 50mm FF equivalent, with all the same FOV properties.

From what I can gather, the answer is no. The EF-S lenses are still subject to the same FOV crop that comes with having a smaller sensor.
Click to expand...

Taking a look at the EF-S wiki page confirms it - check out the list halfway down the page which lists EF-S lenses, as well as their "effective focal length"

http://en.wikipedia.org/wiki/Canon_EF-S_lens_mount
 
Fluke said:
That's not really what he was asking though.

To put it simply, he was asking if a 50mm EF-S lens is a 50mm FF equivalent, with all the same FOV properties.

From what I can gather, the answer is no. The EF-S lenses are still subject to the same FOV crop that comes with having a smaller sensor.
Click to expand...

Yes, looking to see if I still have to multiply 1.6 for the FOV on the EF-S lens. I have been doing this and wanted to make sure. I shot stills with the 5D and have been renting a 5D Mark 2 using video and looking forward to the 7D. Just trying to understand the lens needs on a crop camera. Also understand a 50 is a 50, but need to make some decisions about EF-S.

Thanks for the help! :thumbup:
 
" For example, from directing I'm very used to how a given focal length looks on a 35mm film camera."

so when you use real cine cameras like Arrieflex 435 & 50mm cine lenses
you get 80mm (50 x1.6) equivalent in 35mm FF?

And when they talk about how they used 35, 40, 50 in
American Cinematographer articles
should I think of them as
56 (35 x 1.6)
64 (40 x 1.6)
80 (50 x 1.6) in 35mmFF equivalent?
 
>so when you use real cine cameras like Arrieflex 435 & 50mm cine lenses
you get 80mm (50 x1.6) equivalent in 35mm FF?

Likely not.

1. a 50mm on a 1.6 crop camera has the DOF of the 50mm but a field of view of the 80mm. It is just a crop.

2. Isn't 35mm film about half of 35mm FF still

Uwe
 
ustein said:
>so when you use real cine cameras like Arrieflex 435 & 50mm cine lenses
you get 80mm (50 x1.6) equivalent in 35mm FF?

Likely not.

1. a 50mm on a 1.6 crop camera has the DOF of the 50mm but a field of view of the 80mm. It is just a crop.

2. Isn't 35mm film about half of 35mm FF still

Uwe
Click to expand...


so let's say we have
1) Arrieflex 435 + 50mm cine Lense
2) and 5Dmkii + canon 50 f1.4
at the exaclty same spot
then visually field of view on these two would be same ?

or since 7D sensor size is similar to cine Camera
7D + canon 50 f1.4 's FOV would look more like
-Arrieflex 435 + 50mm cine Lense ?

so in short,
I just want to find out between
-5D mkii + Canon EF 50 f1.4
-7D + Canon EF 50 f1.4

which FOV will be closer to 35mm cine cameras like
Arrieflex 435 + 50mm cine Lense

Please help :)
 
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In relation to cinematography you need to stop thinking about ff35mm still frame and lens sizes. 35mm movie film is roughly the same size as aps-c. If you are reading American Cinematographer and it says a scene was shot with a 24mm or a 35mm or 50mm or whatever, that is the lens you want on the 7d for the same look. That is why aps-c digital cameras are perfect for budding cinematographers whether they shoot motion or not as it gets you used to the lens sizes used in the industry. Forget about crop, there is no crop. Get used to what a given lens does on your camera.
 
dop16mm said:
In relation to cinematography you need to stop thinking about ff35mm still frame and lens sizes. 35mm movie film is roughly the same size as aps-c. If you are reading American Cinematographer and it says a scene was shot with a 24mm or a 35mm or 50mm or whatever, that is the lens you want on the 7d for the same look. That is why aps-c digital cameras are perfect for budding cinematographers whether they shoot motion or not as it gets you used to the lens sizes used in the industry. Forget about crop, there is no crop. Get used to what a given lens does on your camera.
Click to expand...

Thank you.
So visually, Canon 50 1.4 on 7D will be closer to
Arrieflex 435 + cine 50mm than 5d with canon 50 f1.4... right ?
 
ksrksr88 said:
" For example, from directing I'm very used to how a given focal length looks on a 35mm film camera."

so when you use real cine cameras like Arrieflex 435 & 50mm cine lenses
you get 80mm (50 x1.6) equivalent in 35mm FF?

And when they talk about how they used 35, 40, 50 in
American Cinematographer articles
should I think of them as
56 (35 x 1.6)
64 (40 x 1.6)
80 (50 x 1.6) in 35mmFF equivalent?
Click to expand...
Yes, exactly, but of course cinematographers don't think like that.
 
dop16mm said:
In relation to cinematography you need to stop thinking about ff35mm still frame and lens sizes. 35mm movie film is roughly the same size as aps-c. If you are reading American Cinematographer and it says a scene was shot with a 24mm or a 35mm or 50mm or whatever, that is the lens you want on the 7d for the same look. That is why aps-c digital cameras are perfect for budding cinematographers whether they shoot motion or not as it gets you used to the lens sizes used in the industry. Forget about crop, there is no crop. Get used to what a given lens does on your camera.
Click to expand...

Perfect answer, I just wanted to add that the difference between an EF and an EF-S lens is that the EF-S, although having the same focal length as the EF, doesn't need to cover the field of view of the FF sensor, so it can be built a little smaller (and also cheaper). On an FF camera it will show extreme vignetting in the corners.
On the other hand an EF lens, being built for the FF sensor, will have the most perfect picture quality on an APS-C sensor, because the APS-C sensor only covers the center area of the image projected by the EF lens.
 
dop16mm said:
In relation to cinematography you need to stop thinking about ff35mm still frame and lens sizes. 35mm movie film is roughly the same size as aps-c. If you are reading American Cinematographer and it says a scene was shot with a 24mm or a 35mm or 50mm or whatever, that is the lens you want on the 7d for the same look. That is why aps-c digital cameras are perfect for budding cinematographers whether they shoot motion or not as it gets you used to the lens sizes used in the industry. Forget about crop, there is no crop. Get used to what a given lens does on your camera.
Click to expand...

Very good answer. btw, you end with a very Yoda like quote, similar to: Do or do not, there is not try. lol. I just don't think I can ever forget about little Crop! Get! Get Crop! :dankk2:
 
FBAS said:
Perfect answer, I just wanted to add that the difference between an EF and an EF-S lens is that the EF-S, although having the same focal length as the EF, doesn't need to cover the field of view of the FF sensor, so it can be built a little smaller (and also cheaper). On an FF camera it will show extreme vignetting in the corners.
On the other hand an EF lens, being built for the FF sensor, will have the most perfect picture quality on an APS-C sensor, because the APS-C sensor only covers the center area of the image projected by the EF lens.
Click to expand...

Thanks for that explanation. Was going to ask about differences.
 
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