Lens Crop Factor: Here’s a stupid question; I shoot with a Canon 80D, using EF-S lenses. Do the EF-S lenses take into consideration the 1.6x crop factor for focal length and aperture...

Doyleh13

Here’s a stupid question; I shoot with a Canon 80D, using EF-S lenses. Do the EF-S lenses take into consideration the 1.6x crop factor for focal length and aperture, or do I need to adjust for these as I would were I using an EF lens?

My apologies if this question has already been asked somewhere in the forum. I’m new here.

Doyle

jerryc41 Loc: Catskill Mts of NY

Welcome to our forum!

As for the crop factor, what you see in the viewfinder is what you will get. No adjustments necessary.

GoofyNewfie Loc: Kansas City

Doyleh13 wrote:

Here’s a stupid question; I shoot with a Canon 80D, using EF-S lenses. Do the EF-S lenses take into consideration the 1.6x crop factor for focal length and aperture, or do I need to adjust for these as I would were I using an EF lens?

My apologies if this question has already been asked somewhere in the forum. I’m new here.

Doyle

No "adjustment" needed.
The "Crop Factor" is used to give you the equivalent full-frame focal length (field of view) so you can compare other formats.
If you've never shot 35mm or full frame, the information is pretty meaningless.
The focal length and aperture do not change, only the field of view.
If you used a 35mm EF or EFS lens on your 80D, you'd get the same photo.

As Jerry said, just look through your viewfinder.

JPL

Doyleh13 wrote:

Here’s a stupid question; I shoot with a Canon 80D, using EF-S lenses. Do the EF-S lenses take into consideration the 1.6x crop factor for focal length and aperture, or do I need to adjust for these as I would were I using an EF lens?

My apologies if this question has already been asked somewhere in the forum. I’m new here.

Doyle

The crop factor is in the sensor, not the lens.

Doyleh13

So if I want to have the same FoV and DoF as I would get on an EF lens with full frame, but I’m using an EF-S on an APS-C, the answer is to just look at my viewfinder? Wouldn’t it be better to calculate that ahead of time, or should I just swap lenses until it looks right in the viewfinder?

Wingpilot Loc: Wasilla. Ak

Each type lens, full frame and APS-C is made to project the image that enters the lens to fit the size of the sensor. The field of view is different for each, and an APS-C sensor’s image sees, in the case of Canon, 1.6 times that of a full frame camera and lens. Hence, taking the classic example, a 50mm lens on a crop sensor camera, such as the 80D, sees the same field of view as an 80mm lens on a full frame camera, and the image comes in appearing to be magnified. But as was said above, what you see is what you get. The problem is when a full frame lens is used on a crop sensor camera. It just doesn’t work that way, and in fact, can full frame Canon lenses be used on a crop sensor Canon camera?

Doyleh13

Yes, my 80D will mount both EF and EF-S lenses.

BB4A

Wingpilot wrote:

Each type lens, full frame and APS-C is made to pr... (show quote)

I believe that most (if not all?) the APS-C format digital (EF-S) Canon’s can also use all full frame lenses (EF). For the example quoted above, one of my favorite lenses for my 7D Mkii APS-C body is the EF 50/1.4 lens... for some reason (can’t be the doofus behind the eyepiece), that combination works very well for me.

For a quick visual check on an APS-C Camera, look and see if there is both a white square & a red dot on the lens mounting plate. White square is where you line up EF-S lenses (using their white square), and the same for the red dot, on both mounting plate and back of EF lens.

BebuLamar

Doyleh13 wrote:

Here’s a stupid question; I shoot with a Canon 80D, using EF-S lenses. Do the EF-S lenses take into consideration the 1.6x crop factor for focal length and aperture, or do I need to adjust for these as I would were I using an EF lens?

My apologies if this question has already been asked somewhere in the forum. I’m new here.

Doyle

There is no difference between the EF and EF-S lenses if you use it on a crop camera. If you use them on the FF camera then the EF-S lens won't work.

Wingpilot Loc: Wasilla. Ak

BB4A wrote:

I believe that most (if not all?) the APS-C format... (show quote)

Ok. I was under the impression that APS-C and full frame format Canon lenses and cameras were not mutually compatible. Thanks. I am most familiar with Nikon, where one can use either type lens on either type camera, however when using an APS-C lens on a FF Nikon, the result will be a great deal of vignetting on the image.

GoofyNewfie Loc: Kansas City

Doyleh13 wrote:

So if I want to have the same FoV and DoF as I would get on an EF lens with full frame, but I’m using an EF-S on an APS-C, the answer is to just look at my viewfinder? Wouldn’t it be better to calculate that ahead of time, or should I just swap lenses until it looks right in the viewfinder?

Multiply the focal length of the lens you are using on your D80 by 1.6.
35mm x 1.6=56mm full frame equivalent.

I think the equivalent depth of field should be about like using an aperture that's 2/3 stop slower.
Use a depth of field calculator app for getting that info, like this one: :http://www.dofmaster.com/dofjs.html
You must be shooting static objects if you have time to figure this all out ahead of time.
Landscapes, still life, etc.
I shoot a lot of events and similar things and don't have the time or need for this info.
I just look through the viewfinder and use what I see.

robertjerl Loc: Corona, California

Wingpilot wrote:

Ok. I was under the impression that APS-C and full frame format Canon lenses and cameras were not mutually compatible. Thanks. I am most familiar with Nikon, where one can use either type lens on either type camera, however when using an APS-C lens on a FF Nikon, the result will be a great deal of vignetting on the image.

The difference with EF vs EF-S lenses is the mount. EF-S has an extra part that prevents mounting on an EF body. This is because some EF-S lenses have elements that project out the back and can hit the mirror when used. Third party lenses only use the EF mount for Canon because they are made without any projecting elements.
Oh, the "S" stands for either "smaller image circle" or "short back focus" (Canon has given both meanings at times.) and in general the rear element of the lens is closer to the sensor than on FF bodies.

whitehall Loc: Canada

as i understand a a ff lens will project an image to fill a full frame sensor, but a crop sensor will only see the middle portion of the image ( usually the best part). An EF lens takes into account the crop factor and will only project an image that fills the crop sensor. As said previously the size of the captured image will be the same, but depending on the lens the quality may differ

Toment Loc: FL, IL

Don't use an EF-s lens on a full frame Canon, ever!!!

Toment Loc: FL, IL

Don't use an EF-s lens on a full frame Canon, ever!!!