 BetterPhoto Member |
Never could figure out the mm thing I am a 17 year old (18 in a month!) aspiring semi-professional hobbiest photographer (i thought it was a pretty good title too!). I have wondered about this for a while and never had this qestion answered before (I stumbled across this site looking for this answer on the internet). Ok here is goes..... What is the relationship between lens range? ex: 70-300mm I dont fully understand this method of identification of lens capability, though I have some highpothesise (lol thats not how you spell it) on what this means but I would appresiate an explination so that I have the truth. Here is what I think it means(please correct me where I am wrong): The range represents the different sized lenses in the housing of the "lens" this effects the closest distance you can focus from your subject, (in the case of my question) zoom ratio (the larger number divided by the smaller number equals the amount of optical zoom you have?), and I also have a theory that the larger number is the physical size of the lens that is exposed (the smaller number is the size of the smallest lens in the housing?) Anyways, I know I exceeded my one question limit, and I sortof feel like I am writing a mass email......I hope one of you "experts" can help me.
Thanks a bunch eh! lol Alain Filion
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- Gregory LaGrange Contact Gregory LaGrange Gregory LaGrange's Gallery |
no expert the 70-300mm is the focal length. A text book definiton is it's the distance between the optical center of the lens and the film plane when the lens is focused at infinity. A regular definiton is when you change the focal length you change it's magnification/telescopic capabilities. You zoom in or out, you change the spacing of the lenses inside that changes the focal length.
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