when to use a hood ?

Always use a hood too, wouldn't dream of not doing so.
 
I would say always use a hood. Using one saved my 24-70 from a fall!



One thing about the 24-70 hood is the size of it! I can see how that would work, but ... don't be dropping your lenses! :D

I know I was glad I had mine on when I was shooting in lashing rain yesterday, kept drops off the glass - but not much else. It's useful when it's real sunny too , to prevent flare. But why is that hood so bloody huge??

Someone mentioned street photography - the 24-70 is a savage lens for that purpose, but with the hood on you stand out like a huge throbbing sore thumb!
 
One thing about the 24-70 hood is the size of it! I can see how that would work, but ... don't be dropping your lenses! :D

I know I was glad I had mine on when I was shooting in lashing rain yesterday, kept drops off the glass - but not much else. It's useful when it's real sunny too , to prevent flare. But why is that hood so bloody huge??

Someone mentioned street photography - the 24-70 is a savage lens for that purpose, but with the hood on you stand out like a huge throbbing sore thumb!

Because it can be. It would be nice is all lenses had hoods like that but Canon 24-70L is one of very few lenses with what is effectively a zooming lens hood.

The front element slides back and forth inside the hood, maintaining almost optimum shading throughout the focal length range.
 
I was talking about the Nikon 24-70 hood. But it's a similar idea
 
Re: Petal vs. Round hoods.

Petal hoods are generally used where the front element (and thus usually the hood) doesn't rotate during focusing.
Round hoods are used on cheaper lenses where they do...

(Generally - not always the case)
 
Good question this and something i've wondered for a while but never thought to ask, just invested in a hood for my 50mm 1.4 as i've only ever had a filter on it!
 
On my 50mm, I use a rubber hood. Prevents flare just as well as a hard one and has the advantage of being able to be pressed against glass when shooting through windows - reduces reflections (although DG is still a problem).
 
My default approach is to use a hood at all times unless there is a reason not to use one.

For filters it's the reverse - default is not to use one unless the conditions demand it.

You need to be cautious when using a hood which attaches to filter threads as, in the event of a bump, this will transmit the forces to the inner workings of the lens instead of to the solid exterior lens barrel.
 
Always. And - thanks to the "macro" comments, now I understand why my macro lens has such a short hood compared to the other lenses!
 
Yes i know its important and all that but i can say 90% of the time i don't use it.
 
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