 Terry Bromfield |
Canon lenses I understand the 1.6 lens factor that applies to cameras like the Canon EOS 10D and Digital Rebel, but is there any type of lens that can be used with(I have an EOS 10D)that would give a photo similar to a conventional 35mm lens in a film camera or similar to a digital point and shoot photo, neither of which are cropped when viewed on the computer.I'm looking for a lens that would show a more square format that would work better for a portrait. Thank You, Terry
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Steven Chaitoff |
Terry, I'm afraid there is no solution to this crop factor no matter what lens you have. That is because it has nothing to do with the lens; it is an issue with the image sensor: The vast majority of digital cameras have image sensors that are physically smaller than a piece of film. Canon's array of lenses are configured, like all lenses, to project a sharp image 24x36mm at the distance the film is from the camera. So the image covers the film wholly and entirely. But your image sensor is small. In your case with a 1.6x crop, the sensor is (24/1.6)x(36/1.6) or 15x23mm. Canon could make a whole new batch of lenses to account for this, but the one they have are awesome. So the lens projects a 24x36 image onto a 15x23 sensor...you do the math...it only picks up that middle part of the image & thereby appears "closer" like you had a lens with a larger focal length -- even though the lens does what it always does. Now you mentioned a digital P&S with no crop. Even though it's digital, these little cameras that don't have interchangeable lenses are designed so the lens makes an image that fits nicely onto the image sensor, albeit a tiny one. These types of cameras often have tiny focal lengths, tiny max. apertures and tiny sensors - like fingernail sized! Finally the point: What most people do with digital SLR's is they compensate the best they can. If you want a lens that'll shoot like an 85mm focal length on a 35mm camera, instead just get a lens that is actually 50mm so when you use it on your 10D the crop makes it look like nearly 85mm (50x1.6) If you want to shoot ultra wide, that is a problem though. I do not know of any lens that will correct this at the moment, but they may start showing up.
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Terry Bromfield |
Steven, thank you for the informative answer....I will consider the 50mm lens in the future.I appreciate being able to ask questions like this and getting knowledgeable answers.Terry
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