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300mm

The EF 300mm lens refers to a family of telephoto prime lenses made by Canon, five of which have been sold to the general public and one of which was only made on special order. The lenses have an EF type mount which fits the Canon EOS line of cameras.
When used on a digital EOS body with a field of view compensation factor of 1.3x, such as the Canon EOS-1D Mark IV, it provides a narrow field of view, equivalent to a 390 mm lens mounted on a 35mm frame body. With a 1.6x body such as the Canon EOS 650D, it provides a narrower field of view, equivalent to a 480 mm lens mounted on a 35mm frame body.
This lens is most commonly used by sports and wildlife photographers, but is short enough to be use for extreme close-up portraits. Because of its rather high native magnification, it can be used for some macro type photography.

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  1. A

    URGENT Tundish - shorter than the required 300mm???

    Hi, Recently had a new heating system and unvented hot-water cylinder installed (conversion from vented with tank). Everything is working fine despite the installation being rushed at times. The 'main' guy (not the installer) from the company I used (with very good ratings) - can work with...
  2. speedyplumber

    Where can I find a 300mm wide 400mm high or nearest in chrome?

    Planning to use on CH but can be electric too.
  3. B

    ADVICE -Shower leaking via 300mm UPV panels gap? Best way to seal??

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  4. P

    REPLACEMENT SHOWER HEAD ARM ADVICE: WILL IT SUPPORT A 300MM SQUARE HEAD

    Hello Everyone I am replacing an all in one shower arm and 200mm square showerhead a head has fallen off and I had to remove arm. I want to replace with a 300mm head like this. https://www.screwfix.com/p/cooke-lewis-adjustable-ultra-slim-square-shower-head-chrome-300mm/5882t I have now been...
  5. jb2000

    1 1/4" (300mm) bath tap washer?

    We have some large Britannia brass taps, one of which has begun to leak pretty badly because the washer that should be attached to the tap spindle has degraded and is pulling way when the tap's opened. The trouble is, the washer is huge: 1 1/4" (300mm) by the looks of it. Does anyone know...
  6. Scott_D

    Less than 300mm and pipes up the back

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  7. J

    Cut a 300mm hole in lath and plaster ceiling?

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  8. B

    Condensate neutraliser bs6798

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  9. G

    flue 300mm from french doors

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  10. P

    Unvented cylinder discharge pipe

    We recently had a 120 litre Gold unvented cylinder fitted in our first floor airing cupboard. The cylinder's pressure release valve D2 discharge pipe is plastic (originally fitted for the previous twenty year old BoilerMate) and looks about 22mm diameter. There is approx 100mm of vertical...
  11. P

    Cooker Switch & Socket Distance from Gas Hob?

    Hello I need a little help, I cant for the life of me find what the Gas Regulations on the distance of the sockets / cooker switch need to be from the hob. IET Recomendation is 300mm but thats a recomendation only. From what I can find gas reg wise again recomendation of 300mm & fire...
  12. W

    300mm towes rads

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  13. jonnyswamp

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  14. Sid Viscous

    300mm?

    Refresh my memory guys, min. distance from boiler to electric meter - I've got 300mm in my head, that right?
  15. B

    gas hob clearance

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  16. P

    Clip your Polyplumb or this! pic

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  17. L

    FlexiSure Comp-Connector in Smaller Sizes

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  18. B

    poor work

    went to look at a job today old lady said her new boiler was dripping water and this is what i was faced with.i know on terrace houses siting the flue can be a pain but there is no excuse for this.i hate fitting the flue in a position like this even if its over 300mm away incase the wind blows...
  19. R

    Bending 15/22 mm copper pipe - how do you measure it?

    Dear Friends Just thinking about things! If you have a piece of 15mm copper pipe 500mm long, and you need to bend it at say 300mm to go around a corner (90 for arguments sake), how do you do it? i.e Do you measure 300mm along pipe, put pipe in bender, 300mm mark aligned with edge of former...
  20. M

    baxi combi

    anyone no the distance a flue on a baxi has to be away from a opening front door
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