If the widest angle was 25mm, it would be 75mm. Even though the amount of magnification is the same, images taken at mm and 75mm have very different viewing angles and produce very different images. Please use the following chart as reference for the correlation between magnification and millimeters. Relationship between Lens Magnification and Lens Length mm. Magnification ratio on a camera is how much the image is proportionally recorded on the media.
If you really want some ref, you can yake a look at my online datasheet I've done for my own reference. You need to take it one step further and double the mm equivalency of the G3 to mm which is the effective range when using the 2x afocal converter.
The conclusion is the same, the 20D with the long lens will have even greater reach than the current G3 combo. The OP should be fine. First of all, the "3X zoom" that you see on your camera quantifies the ratio between the longest and shortest focal lengths of the zoom. Nothing to do with the max magnification or reach of the lens, except that the max is 3X the min magnification, or focal length, or inverse of field of view.
What you really meant to ask can indeed be frame as magnification, but not the magnification that so many mentioned, which is the ratio of image size in the focal plane to object size at a particular distance.
To compare across cameras, you need to look instead at the magnification to a standardized comparison print size. The ratio of size of image in an 8x10 print for example to object size at a particular distance, is the magnification that you can compare across different camera formats. This corresponds to what people call the "reach" of the lens, the inverse of the field of view. I might as well throw in my 2d worth.
It's not really magnification we are talking about. Few digital camera lenses could fill that hole with image OK I zoom the lens and it gets bigger but as I see it it is reduced less. Nothing like being pedantic, is there? You only get magnification when using a microscope; then and only then will the image on the CCD be bigger than the object.
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Best cameras and lenses. All forums Open Talk Change forum. Started Jan 28, Discussions. Forum Threaded view. Jan 28, Thanks, Ken. Reply to thread Reply with quote Complain. It does give some indication of the amount of zoom that is available, but you need to where that zoom starts to compare two cameras ie mm and mm would both be 3x, but the two are quite different If you follow this then you will see that the magnification factor is somewhat meaningless on DSLR as a mm 2.
Cal kelcom wrote: Is there some formula to equate a certain mm lens to a magnifcation factor? Cal V's gear list: Cal V's gear list. Reply Reply with quote Reply to thread Complain. The OP didn't say "zoom factor", he said "magnification factor.
For telephoto this expression will give you a pretty good idea of the magnification. Hope this helps Thanks, Ken Hi Ken, Essentially, if you double the focal length you have an approximate magnification factor in power.
For crop factor sensors multiply the true focal length by the crop factor such follows: Canon 20D, D30, D60, 10D, D 1. The camera manufacturers don't exactly agree, but Hi Ken, Most consider, in 35mm equivalent terms, a focal length somewhere between 45mm and 55mm to represent a magnification factor of 1. Rick kelcom wrote: Is there some formula to equate a certain mm lens to a magnifcation factor?
Patrick T. In reply to Patrick T. Kelly wrote: The focal length doesn't change as far as magnification is concerned.
Best regards, Lin. There is no equivalence involving these two parameters. Other parameters must be considered. Most people call this "crop factor" for some reason What would you use an actual magnification ratio range for?
Your reasoning is incorrect Ken pegasus wrote: Your reasoning is incorrect Search Articles. Glossary Off On. What is Lens Focal Length Focal length, usually represented in millimeters mm , is the basic description of a photographic lens.
Standard Lens FX format approx. Telephoto Lens FX format approx. Super Telephoto Lens FX format approx. More Like This More articles like this. Article Collections. Articles like this, right in your inbox. First Name required. Last Name required. Email required. Popular Topics. More from Nikon. Close Window Share this article by email.
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