Lens Hoods

Can I use the lens hood that came with the 24-105L ef on the 17-55 ef s? The 24-105 is EW-83H and the one listed for the 17-55 is EW-83J. The EW-83H seems to fit fine on the 17-55.
Is there a difference?
Thanks.

The lens hood designs are what Canon feels help reduce flare and ghosting, so the hoods specified for the lenses are what you should use. There isn't a negative effect of using the hoods on different lenses. However, you might find that you can see the hood through the viewfinder at the 17mm mark. That's because the 83J hood is wider than the 83H.

Only one way to find out. Shoot some photos with it, and see if you can the hood.

You'll get vignetting of the shorter focal lengths.

Remember that lens hoods actually are designed for AOV! A 24-105mm on FF camera sees 23 to 84 degree AOV; a 17-55mm EFS lens sees 28 to 77 degree AOV. So at the wide setting, the 24-105 hood is designed to not vignette to 84 degrees, so using it on the 17-55 with the lens wide open would mean that it does not provide as much shading as the 17-55 hood.

20droger wrote in post #3655851
You'll get vignetting of the shorter focal lengths.

Hoods are designed for the widest end of the FL range, not the narrowest!

Wilt wrote in post #3655990
Remember that lens hoods actually are designed for AOV! A 24-105mm on FF camera sees 23 to 84 degree AOV; a 17-55mm EFS lens sees 28 to 77 degree AOV. So at the wide setting, the 24-105 hood is designed to not vignette to 84 degrees, so using it on the 17-55 with the lens wide open would mean that it does not provide as much shading as the 17-55 hood.

Hoods are designed for the widest end of the FL range, not the narrowest!

But the shortest focal lengths are the widest

pwm2 wrote in post #3656794
But the shortest focal lengths are the widest

Situation A (17-55): 17mm sees 77 degrees on APS-C
Situation B (24-70): 24mm sees 84 degrees on FF

So if you took Hood B and put it on lens A, at 17mm (77 degrees) it would not vignette because the hood is designed for a wider 84 degree AOV; but it also would not provide as good quality of shading from strong light sources like the sun.

And if you took Hood A and put it on lens B (which is not what the OP was asking), at 24mm it would vignette because the lens sees 84 degrees yet the opening of the hood is designed for the narrower 17mm (77 degree) AOV

At the other end of the focal range, which is what 20droger was commenting about...

So if you took Hood B and put it on lens A, at 55mm it would not vignette because it is designed for a wide 24mm AOV; and it also would not provide as good quality of shading from strong light sources like the sun, as a hood for a dedicated tele zoom or single FL zoom!

And if you took Hood A and put it on lens B, at 70mm it would not vignette because it is designed for a wide 17mm AOV; and it also would not provide as good quality of shading from strong light sources like the sun, as a hood for a dedicated tele zoom or single FL zoom!

Wilt wrote in post #3656884
Situation A (17-55): 17mm sees 77 degrees on APS-C
Situation B (24-70): 24mm sees 84 degrees on FF

So if you took Hood B and put it on lens A, at 17mm (77 degrees) it would not vignette because the hood is designed for a wider 84 degree AOV; but it also would not provide as good quality of shading from strong light sources like the sun.

And if you took Hood A and put it on lens B (which is not what the OP was asking), at 24mm it would vignette because the lens sees 84 degrees yet the opening of the hood is designed for the narrower 17mm (77 degree) AOV

At the other end of the focal range, which is what 20droger was commenting about...

So if you took Hood B and put it on lens A, at 55mm it would not vignette because it is designed for a wide 24mm AOV; and it also would not provide as good quality of shading from strong light sources like the sun, as a hood for a dedicated tele zoom or single FL zoom!

And if you took Hood A and put it on lens B, at 70mm it would not vignette because it is designed for a wide 17mm AOV; and it also would not provide as good quality of shading from strong light sources like the sun, as a hood for a dedicated tele zoom or single FL zoom!

No, 20droger did write:

I.e. that the wrong hood will give vignetting at the wide end of the lens. You are talking about the same thing. No one in this thread is worrying about the 55mm/70mm range.

pwm2 wrote in post #3656937
No, 20droger did write:
I.e. that the wrong hood will give vignetting at the wide end of the lens. You are talking about the same thing. No one in this thread is worrying about the 55mm/70mm range.

Misread MULTIPLE times!!!

Happens to us all

When I cannot recall what the original question is, and provide an answer to a completely different question, then I know I am suffering from Old Timer's Disease and should disconnect my internet cable permanently!

Ah, but a large part of our reading skills are based on our assumptions - what we expect to read. When we have made a decision what a sentence says, we can read it many times without seeing the error - or that the sentence may have several meanings. While missfiring sometimes, that extrapolation skill is probably one of the most important aspects of humanity.

I have an 83H hood and an 83 hood (made in China, bought from eBay.) Use them interchangeably on either the 10-22, 17-55 or 24-105. No problem.

Allow me to correct myself.

Since one of your lenses is an EF-S lens, I presume you have a 1.6× camera.

The EF 24-105mm lens is designed for a 1.0× camera and has a maximum angle of view on such a camera of 84.1°. The EW-83H hood designed for this lens therefore accomidates an angle of view of 84.1°.

The EF-S 17-55mm lens is designed for a 1.6× camera and has a maximum angle of view on such a camera of 77.0° . Since the EW-83H is designed for an angle greater than 77.0°, it should work well on the EF-S 17-55mm lens.

My apologies for my first answer. That answer was off the top of my head, and assumed everything was equal. But everything wasn't equal. The lenses were designed with different-sized sensors in mind, which changes everything.

Thanks for all the input.
20droger-I ordered the proper hood yesterday! I should have mentioned in my first post that I have a Canon XTI.
Oh well, I think it will be better to have separate ones anyway. That way I can leave them on the lenses.
Thanks again.