lens hood
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You can't use a petal hood on a lens where the front rotates with focusing - must be a round one.
Different focal length lenses require different size hoods, even if they're the same fitting. Canon makes the best hoods, specifically to fit each lens.
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Short answer is that it depends.
While they are both the same diameter if your wanting to use plastic hoods (such as the Canon ones or Canon knockoffs) then you will need a hood for each lens or else the hood will either be ineffective on your 55-250 or will cause vignetting on your 18-55.
You can also get collapsible rubber lens hoods. If you got one of those then it would be suitable for both lenses as you can change the length of the hood.
Also those lenses can't use petal style hoods since the front element rotates. You will need a fully circular hood for either of the lens whether it's plastic or rubber.
Edit: beat to it it seems
Edit 2: the Canon hoods are pricey but cheap knockoffs are plentiful on ebay. Quality on these range from ok (good for the price) to practically indistinguishable from the official hoods
While they are both the same diameter if your wanting to use plastic hoods (such as the Canon ones or Canon knockoffs) then you will need a hood for each lens or else the hood will either be ineffective on your 55-250 or will cause vignetting on your 18-55.
You can also get collapsible rubber lens hoods. If you got one of those then it would be suitable for both lenses as you can change the length of the hood.
Also those lenses can't use petal style hoods since the front element rotates. You will need a fully circular hood for either of the lens whether it's plastic or rubber.
Edit: beat to it it seems
Edit 2: the Canon hoods are pricey but cheap knockoffs are plentiful on ebay. Quality on these range from ok (good for the price) to practically indistinguishable from the official hoods
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yeah richard im still not sure exactly what i need as in a hood for this kit http://panamoz.com/index.php/canon-eos-600d-18-55-kit.html
also ill be adding a 55-250 maybe
cheers
steven
also ill be adding a 55-250 maybe
cheers
steven
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A lens hood is to shade the lens from bright light, as you would do with a hand over your eyes or with the sun-visor in a car. Its main purpose is to reduce flare, but hoods are also very useful as physical protection, and do not reduce image quality like a protection/UV filter can sometimes do. I use one all the time.
Ideally, a lens hood should be rectangular, and just big enough so that it doesn't encroach into the image (known as vignetting). Wide-angle lenses must use a very shallow hood, but longer focal lengths can be made much deeper. It follows that with a zoom which changes focal length, the hood should also 'zoom' with it, but very few lenses are able to do that. Therefore, almost all hoods, they can only ever be an ideal size at the shortest focal length setting (but don't worry about it).
A petal hood is actually reactangular as seen through the lens (put one up to your eye and you'll see) but you can't use one on a lens that has a rotating front when it focuses. Both the 18-55 and 55-250 have rotating fronts, so must use a round hood to prevent vignetting at all focus positions.
A lens hood must be black inside. The genuine Canon hoods are lined with black flocking which is very effective. Most cheap hoods are just matt black plastic or paint, which isn't actually very black at all. Self-adhesive black felt is a good subsitute (HobbyCraft, only a few pence).
The Canon hood for the 18-55 lens is EW-60C, and ET-60 for the 55-250.
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thanx for that info on the hood richard
and your point on the uv filter do i not use one ?
thanx again
I only ever use a protection filter when obviously necessary, eg sea spay, flying mud or whatever. UV has no effect with digital, but you can get image quality probelms in certain conditions with a filter (flare and ghosting mainly).
Just be careful (your own finger marks are the most likely culprits) and don't be afraid to clean the lens. Brush off any debris with a blower or fine brush, then wipe with a microfibre cloth, using a bit of gentle rub and heavy breathing if necessary. Lens surfaces are tougher than they look.
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There is a specific lens Hood for almost every lens. On most lenses you get the Hood with the lens, on others the manufacturer doesn't give you one, but will sell you one if you want. 
:nono: :razz:
If I needed a replacement hood, or even just a Hood for a lens that didn't come with one, I would find the model number of the original, by putting say 'Canon 50mm 1.8 II lens hood' into a search box. With the answer I would then see what the best price I could get for the Canon one, in this example, and the do a search on eBay for the model of Hood, and see how much the copies are. If the price difference is large enough, I'll get the copy. :shrug: It's not that hard to copy a Hood, seeing as the can copy something as complex as a iPad.
For the price they cost to make, reflected in the price of the copies, with, you would imagine, a large mark up for profit, it is a bit naughty and cheap not to get one in with the camera imho.
No doubt someone will be on that you shouldn't buy copies, and that the Hood wouldn't be as good as the manufacturers, but if they weren't trying to rip you off by not including one, then you wouldn't have to consider an alternative. :shrug:
Just done a quick search for a Canon ES-62, (for the Canon 50mm 1.8 II) and it came up for £17.11 on Amazon. Did the same on eBay, and one came up for £1.41.
I know which one I'd buy. 
You pays your money, you makes your choice.
I would say definitely get, and use, a lens Hood for all of your lenses. Most can be reversed and put back on the lens, and so not take up much more room in a bag, but offer so much more in return. :shrug:
:nono: :razz:If I needed a replacement hood, or even just a Hood for a lens that didn't come with one, I would find the model number of the original, by putting say 'Canon 50mm 1.8 II lens hood' into a search box. With the answer I would then see what the best price I could get for the Canon one, in this example, and the do a search on eBay for the model of Hood, and see how much the copies are. If the price difference is large enough, I'll get the copy. :shrug: It's not that hard to copy a Hood, seeing as the can copy something as complex as a iPad.
For the price they cost to make, reflected in the price of the copies, with, you would imagine, a large mark up for profit, it is a bit naughty and cheap not to get one in with the camera imho.
No doubt someone will be on that you shouldn't buy copies, and that the Hood wouldn't be as good as the manufacturers, but if they weren't trying to rip you off by not including one, then you wouldn't have to consider an alternative. :shrug:
Just done a quick search for a Canon ES-62, (for the Canon 50mm 1.8 II) and it came up for £17.11 on Amazon. Did the same on eBay, and one came up for £1.41.
I know which one I'd buy. You pays your money, you makes your choice.
I would say definitely get, and use, a lens Hood for all of your lenses. Most can be reversed and put back on the lens, and so not take up much more room in a bag, but offer so much more in return. :shrug:
There is a specific lens Hood for almost every lens. On most lenses you get the Hood with the lens, on others the manufacturer doesn't give you one, but will sell you one if you want.
If I needed a replacement hood, or even just a Hood for a lens that didn't come with one, I would find the model number of the original, by putting say 'Canon 50mm 1.8 II lens hood' into a search box. With the answer I would then see what the best price I could get for the Canon one, in this example, and the do a search on eBay for the model of Hood, and see how much the copies are. If the price difference is large enough, I'll get the copy. :shrug: It's not that hard to copy a Hood, seeing as the can copy something as complex as a iPad.
For the price they cost to make, reflected in the price of the copies, with, you would imagine, a large mark up for profit, it is a bit naughty and cheap not to get one in with the camera imho.
No doubt someone will be on that you shouldn't buy copies, and that the Hood wouldn't be as good as the manufacturers, but if they weren't trying to rip you off by not including one, then you wouldn't have to consider an alternative. :shrug:
Just done a quick search for a Canon ES-62, (for the Canon 50mm 1.8 II) and it came up for £17.11 on Amazon. Did the same on eBay, and one came up for £1.41.
You pays your money, you makes your choice.
I would say definitely get, and use, a lens Hood for all of your lenses. Most can be reversed and put back on the lens, and so not take up much more room in a bag, but offer so much more in return. :shrug:
Brilliant help. Many thanks for taking the time for that.
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If it's designed for the lens that it's going to used on, I see no problems.
You used to be able to get rubber lens hoods for 50mm lenses. I'm assuming all 50mm lenses angle of view were the same, and so could be made to a standard size. :shrug:
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Hi Steven
As Richard says "The Canon hood for the 18-55 lens is EW-60C, and ET-60 for the 55-250", you need to get the lens hood that is designed for your lens, both are a bayonet fitting and both are round, but the 55-250IS hood is deeper.
You choice is genuine Canon or 3rd party lens hood - If there isn't much difference in price, I'd opt for a genuine one. If you do opt for a 3rd party one, make sure the inside of the hood is a matt finish, so you don't get any unwanted reflections.