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Old 01 December 2005, 08:15   #21
Country: UK - Scotland
Town: Highlands
Boat name: Quicksilver
Make: Quicksilver
Length: 3m +
Engine: Mariner 15hp
Join Date: Aug 2001
Posts: 1,771
Hi Jwalker

Canon EF system lenses will fit both the film and digital cameras, so if you already have a set for your Canon film camera they will be okay with a Canon digital slr. All the autofocus and autoexposure facilities will work as on the film camera.

This is the case with all major manufacturers, Nikon, Olympus, Pentax etc. They do this so that when (if) you change to digital you will buy another camera of the same make as you do not have to buy a new set of lenses.

The only difference when using the lenses on, for example, a Canon digital slr is that the digital sensor is smaller than a 35mm film frame. This means that the focal length of any lens is increased. In the case of Canon (excluding the new 5D which has a 'full frame' sensor) this difference is a multiplier of 1.6x. Therefore with a 100mm lens, on a digital camera it is the equivalent of a 160mm lens. My 500mm lens is the equivalent of an 800mm lens. Great for telephoto but not so good for wideangle. A 28mm lens becomes a 44mm lens. so you get less of a wideangle. To overcome this you can use something like a 20mm which gives you a 32mm.

You can now buy lenses especially made for digital that are built to compensate for this difference. However it is not a problem at all, you just need to get used to the difference.

Another good website for camera reviews is :Steve's Digicams

Thanks for the compliments all.

Keith Hart

Small boat - BIG truck
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Old 01 December 2005, 08:32   #22
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,850
Thanks, Keith. I have a couple of Olympus slr's plus lenses and I'd given up on them. I'll need to visit their site again because I hadn't realised my OM fit lenses could be used. However, I've looked at the Canon kit, I'm a wide angle freak, and they have a 10-22mm lense. Now.....where's that little plastic card hiding?......

Do you do only digital photography cos I've got a pile of darkroom gear, medium format and 35mm including a Durst auto paper processor, 20x16 drums and film drums and I'd give it away to a good home.

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Old 07 December 2005, 13:23   #23
Country: UK - Scotland
Town: Invergordon
Boat name: Spare
Make: Ribcraft
Length: 6m +
Engine: Mariner 175
Join Date: Apr 2005
Posts: 18
Al79, Invergordon eh! I'll swap you a day out with me on expedition for a day out in your rib.

Hey Keith, sounds like a plan! Will get in touch some time about it. Am taking the boat out of the water in the next couple of weeks so i think it will be next year now...

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