Lens hood question?

rich56k

I rented a canon 24-105 / f4.0 L for a drag racing event this w/end...(yes I'll be close - in hot, bright sun)
I already have a canon 24-70 / f2.8 L (need more reach)
Will be using a canon 20D w/580EX for fill flash...

my question is can I use the lens hood from the 24-70 (EW-83BII - the big one on the left) on the 24-105 (came with EW-83H - small one on the right)??? :dunno

It fits fine - however the size diff. is pretty big - will this adversely effect the end result?

I just don't want to scrape up the new EW-83H

thanks

rich56k

digismile

The longer lens hood may cause some (severe?) vignetting around the edges. I expect it will be pretty obvious. Try some test shots starting at the widest focal length.

ivar

Both of them have short end at 24, so I wouldn't see a problem why it wouldn't work. I do very much wonder why the one from the 24-70 is so much bigger though

PeterLyons

I'd propose using the hood intended for the lens.

And an additional note. I find that the cloverleaf hoods are especially prone to getting knocked and twisted off accidentally. I've lost several this way. But I do learn. Now I keep all my hoods taped on with a strip of gaffers tape. In fact I also use gaffers tape to keep the master dial on my 5Ds from twisting out of AV mode, which is where I keep it almost all the time. The tape lends the camera a pleasing grungy look and may help you get over worrying about scraping up your gear.

Or... just cover the entire hood with tape; that'll keep it protected.

donek

Take test shots and see. Look through the view finder.
if you can see the lens hood on the wide shots, you shouldn't use it.

rich56k

Brad, Ivar, Peter & Sean,

Thanks !

As I get ready to head to airport the consensus is...
1-take both
2-tape the new one
3-test both
4-although canon prob. has a reason for this beyond my range of knowledge...
5-wear tons of sunblock 5000
6-let you know the results

thanks for the fast replys!!

rich

PeterLyons

An additional note.

The lens hoods that ship with EF lenses are cut to provide maximum peripheral light protection allowed by the widest angle of that lens. On a FULL FRAME body. Your crop-sensor body means your widest angle is quite a bit narrower, and you could get by with a longer hood. You can mostly see this by looking through the viewfinder, but not totally. The viewfinder in most cameras covers slightly less than the full frame. You can see more by moving your head slightly side to side as you look through the viewfinder.

I suppose it's always best to use the longest hood possible. So maybe, to your list of stuff to bring, add a box cutter. Then you can cut back that long hood of yours to fit your 24-105 just perfectly for your 20D.

tjstrider

the reason they are different lengths is because the 24-70 attaches to the body of the lens whereas the 24-105 attaches to the lens objective end ... hence when the lens on the 24-70 moves the hood does not...

whereas the lenshood for the 24-105 moves with the end of the lens...

I like the longer one more b/c i can set the lens down on the hood and not damage the zoom function.

rich56k

tjstrider wrote:

the reason they are different lengths is because the 24-70 attaches to the body of the lens whereas the 24-105 attaches to the lens objective end ... hence when the lens on the 24-70 moves the hood does not...

whereas the lenshood for the 24-105 moves with the end of the lens...

I like the longer one more b/c i can set the lens down on the hood and not damage the zoom function.

Again thanks to all for your input

tjstrider is right - and I hadn't noticed that until he mentioned it - so I didn't bother trying to switch hoods
...not sure why canon designed them as such - but lends to Peters suggestion also re: use hood on lens designed for AND the tape worked great!! Hood returned completely unscathed even though weekend was in both extreme weather (100+ air temp/track surface 140+) and not many cushioned places at the strip to set gear down :cry

on a related note the 24-70 recently had its 'zoom gaskets' replaced at cost of $160 due to sloppy play when lens extended (side-to-side) I guess from no zoom lock and between shots at the track I hang my gear from shoulder ( due to sweat around neck) so the lens can extend and sway?

and hows this for a situation - my 20D was in for routine clean/lube so the loaner I had, had just as many dust spots on sensor as mine!! karma maybe!?!? hope not! but there's a lesson there!

-rich56k