Lens Crop Factor (Page 2): Twice for emphasis Oops...

Toment Loc: FL, IL

Twice for emphasis
Oops...

mwsilvers Loc: Central New Jersey

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

As has been said elsewhere, the crop factor is dependent on the sensor of your camera, not the lens. The crop factor is the same regardless of whether you have a crop designed lens or a full-frame lens mounted on your camera. The 35mm equivalent angle of view at a given focal length will be identical regardless of whether you use a crop sensor lens or a full-frame lens

frankraney Loc: Clovis, Ca.

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

nope, just point and shoot. What you see is what you get. The EF lens is for a full frame, but your camera will crop it.

Rally-Gator Loc: North Carolina

Simply stated, the EF-S lenses have a smaller opening near the sensor, therefore they cannot be used with a full frame camera without causing major vingnetting. The EF lens has a larger opening to fit the full frame sensors. As your camera has an APS-C sensor (cropped), it can be used with either an EF or an EF-S lens, with the same results. Typically, the EF-S lens in a little less expensive than the EF, due to smaller optics required. If you are ever thinking about changing to a full frame camera then you are further ahead by buying the EF lens now, and keeping it to use with your new camera. As to the crop-factor, both the EF & the EF-S lenses will produce the same image on your APS-C sensor, i.e. multiply the focal length by 1.6 to get the 35mm effective focal length, regardless if it is an EF or an EF-S. Hope that clarifies it a little for you.

DeanS Loc: Capital City area of North Carolina

Toment wrote:

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

You can’t - won’t mount. Canon EF lens will not mount to a Canon FF body. Some, if not all, third party crop lens will mount to a Canon FF body, Though results will be iffy.

whitehall Loc: Canada

Quite, that was not my point.

DeanS Loc: Capital City area of North Carolina

DeanS wrote:

You can’t - won’t mount. Canon EF lens will not mount to a Canon FF body. Some, if not all, third party crop lens will mount to a Canon FF body, Though results will be iffy.

This reply should read “Canon EF-S lens will not fit a Canon FF body.” Sorry for the omision.

whitehall Loc: Canada

Thanks. I had your point. What I was really saying is that I assume that if one puts a ff lens and an efs lens on a crop frame body, one may get a better iq with the efs lens assuming that the quality if the two lenses is equal because the efs lens is designed for a crop body.

DeanS Loc: Capital City area of North Carolina

whitehall wrote:

Thanks. I had your point. What I was really saying is that I assume that if one puts a ff lens and an efs lens on a crop frame body, one may get a better iq with the efs lens assuming that the quality if the two lenses is equal because the efs lens is designed for a crop body.

I have never tested this, but my guess is that in a normal size print or view on a screen, your eye won’t detect a perceptible diff.

frankraney Loc: Clovis, Ca.

DeanS wrote:

I have never tested this, but my guess is that in a normal size print or view on a screen, your eye won’t detect a perceptible diff.

whitehall Loc: Canada

Thanks.

BB4A

Toment wrote:

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

I don't think that's possible. There's no way I can see that I could mount an EF-S lens correctly on either of my FF Canons (5D Mk iv & 1DX Mk ii).

As I mentioned above, the EF-S lenses have a white square on their base; that's the match-up point for the mounting plate on the crop sensor Canon camera body. FF Canon camera bodies only have the red spot on the mounting plate, which corresponds to the mounting position indicated by the red spot on a EF lens base. APS-C 1.6X crop sensor Canon camera bodies that I'm familiar with (and I only have much experience with the 7D Mk ii, which IMHO is a truly excellent camera!) have both the white square and the red spot, obviously in different places so that the two types of lens can be accommodated on that body type.

robertjerl Loc: Corona, California

BB4A wrote:

I don't think that's possible. There's no way I ca... (show quote)

Inquiring minds want to try anyway, they cut the tab off on the EF-S lenses so they will mount on the EF body. Then at some point they try it with one of the lenses that has a protruding rear element and the lens element and the mirror on the FF or 35 mm camera meet resulting in more work for the Canon Repair Center.

So if you want to help the repair tech afford that special gift for his kids go ahead and cut the tab off. He can use the overtime.

rehess Loc: South Bend, Indiana, USA

whitehall wrote:

Thanks. I had your point. What I was really saying is that I assume that if one puts a ff lens and an efs lens on a crop frame body, one may get a better iq with the efs lens assuming that the quality if the two lenses is equal because the efs lens is designed for a crop body.

More likely, the EF version of the lens would give a better image because the sensor would use the inner part of the image cast by the lens, and for most lenses the outer edge is less good.

BB4A

robertjerl wrote:

Inquiring minds want to try anyway, they cut the tab off on the EF-S lenses so they will mount on the EF body. Then at some point they try it with one of the lenses that has a protruding rear element and the lens element and the mirror on the FF or 35 mm camera meet resulting in more work for the Canon Repair Center.

So if you want to help the repair tech afford that special gift for his kids go ahead and cut the tab off. He can use the overtime.

Hah! I understand your point, for "enquiring minds" I'm now thinking of some of the Engineering "Experts" I've run across in the past. For me, the term Expert is a two - root word:
Ex = A has-been (or, never-was, masquerading as a has-been)
Spurt = A drip, under pressure.

I profess to never having been an Expert in anything... you won't catch me cutting the tabs off anything "just to see if it will fit?"