I'm going to buy a Canon Rebel DSLR as soon as I can afford one and had a question.
When looking at lenses (specifically telephoto lenses), it has marks in MM I believe. like 35mm-60mm or something.
When looking at telefoto lenses, all I really want to know is what is that in relation to X in optical zoom.
IE: if it says something like 35mm-60mm does it equate to 50x optical zoom?
Anyone know how to compare the two to get an estimate on the X?
2007-01-05 16:56:18 · 5 answers · asked by biggestperlnerd 3 in Consumer Electronics ➔ Cameras
A normal lens on a 35mm film camera is 50mm (millimeters). Digital cameras have around 1.5 conversion factor from film cameras, so a wider lens will be a normal lens. So a 35mm lens will be considered a normal lens. Smaller numbers are wider, larger numbers are telephoto.
The X in optical zoom just refers to how far it zooms out. So if you have an 18mm lens at its widest, 2x puts it at 36mm. A 50mm to 100mm would be 2x. Simple math.
I think the best way to decide on different lenses is to go to a camera store and try them out to see for yourself. You will be holding that camera for vacations and such, and you will want one you're comfortable with. And you can try out the zoom and see just how far out it zooms.
2007-01-05 17:41:49 · answer #1 · answered by Terisu 7 · 1⤊ 0⤋
The x-power of optical zoom on a digital point-and-shoot camera is the difference between the cameras longest focal length and its shortest. For instance, my Panasonic FZ1 has a focal length of 4.6 mm to 55.2mm. That works out to be a 12x zoom (55.2 divided by 4.6) with that equating to 35mm - 420mm in SLR terms.
On the lens you are looking at a 60mm would only be around a 2x lens. To get to 50x you would need a telescope. That said, don't get too hung up on the "x". If the lens is a normal SLR lens (not specificaly digital) you can multiply the numbers by 1.6 for your Canon so the 60mm end becomes a 96mm lens which is a nice focal length for portraits. You can also pick up lenses that are in the 200mm (320 on your digital) fairly cheaply and they will take you out about as far as you can hand hold anyway. Anything more and you'd need image stabilization or a tripod.
I'd suggest getting a lens with as low a number as possible so that you can do wider angle shots. Something like an 18-70, or 18-55. Then add a longer ranged telephoto.
I hope this helps.
2007-01-06 01:44:58 · answer #2 · answered by k3s793 4 · 0⤊ 0⤋
yes 60 divided by 35 = 1.7 or 1.7 times zoom. However looking at say 6 times zoom is a relative thing depending on where you start from.
SLR cameras use a more professional approach. They say that 50 -55 mm, is 'normal' or about what the human eye would see. Any number smaller than that is considered a wide angle lens, and any lens with a number higher than that is considered a telephoto lens.
So an 18 - 55 mm lens is a zoom lens that covers wide angle to normal. A fixed 300mm lens is not a zoom lens, but it is a telephoto lens.
Don't forget that the Canon has a 1.6 'crop factor' due to the sensor being smaller than 35mm film (nothing to do with 35mm focal length). So your 35 - 60mm lens will work as a 56 - 96mm lens!
2007-01-06 02:55:56 · answer #3 · answered by teef_au 6 · 0⤊ 0⤋
its equal to 1.5x . a 50 x will be equal to a lens that is 20000mm in built. thats technicaly immposible. you can go for a 90 - 300 mm which on a dslr will be = 12 x ( 100 - 450 )mm .
2007-01-06 03:09:12 · answer #4 · answered by Subho 2 · 0⤊ 0⤋
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2007-01-06 01:03:26 · answer #5 · answered by Chris W. 2 · 0⤊ 1⤋