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50mm is 50mm but you have to take the sensor size of the camera into concideration surely?
Example: Using a 50mm lens on a Canon 5D MkII (FF) and a Canon 450D (1.6x crop) will give you a different image - the 5D image will be wider (true 50mm in 35mm film camera terms) because the image from the 450D will have a focal length of 80mm. How can they be the same? They're not!
No, absolutely not.
The focal length of a lens is determine by the construction of the lens.
Think of it this way. Imagine you have a 50mm lens and you stand that lens next to a Canon 400d. Does the mere fact that the lens is next to a canon 400d change it's focal length? No! Now move that lens and sit it next to a Canon 5d. Has the focal length of the lens once again changed because of its proximity to a differnent body? No!
So, as I said focal length is focal length is focal length.
When we attach that lens to different cameras, we notice that what changes, due to sensor size, is the field/angle of view. Thus to scale an image taken on a 400d to that taken with a 5d you end up with a conversion factor of 1.6 which has erroneously come to be known a the magnification factor/crop factor. etc etc etc.
Panoramas can be fun. This is a quick one I did on Tuesday just outside Inverness. Just parked in a layby and took three images to cover about 120deg or more. Didn't give this one much thought but best results are gained if you set the camera to manual and have the lens set to the equivalent of about a 50mm focal length for 35mm film.
This was taken with a Panasonic LX3 with 5mm lens, handheld. Three shots all in RAW format, processed in Lightroom and stitched together in Photoshop Elements.
Not the best I have but I like it. Click on the image to see it all - its a large image
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