Lens
Dec 16, 2017 09:53:11 #
Dec 16, 2017 10:00:47 #
A telephoto can be either a prime (fixed focal length) or a zoom (a range of focal lengths). This article might help:
https://www.naturettl.com/should-you-use-a-zoom-or-prime-telephoto-lens/
https://www.naturettl.com/should-you-use-a-zoom-or-prime-telephoto-lens/
Dec 16, 2017 10:02:32 #
Dec 16, 2017 10:07:21 #
For full frame 35mm cameras a telephoto would be a lens with a focal length of 85mm or more. A zoom is a variable focal length lens and can also be a wide angle zoom. Some of the new zooms have a very wide range from wide angle to long telephoto.
Dec 16, 2017 10:17:10 #
btaylor356 wrote:
What is difference between telephoto and zoom lens?
Regardless of lens length (telephoto of not)...
The difference is simple and primitive w/o entering the specialization of lenses such as prime lenses.
One has a fixed focal length, the other does not, it has a variable focal length.
Other consideration: The fixed lens aperture is constant. The zoom has the same aperture scale but in reality the amount of light varies depending one the focal length used at the same aperture. This means the zoom lens does not report the aperture for DoF (Depth of Field) correctly.
You have other issues but not relevant to a simple answer.
Dec 16, 2017 12:16:45 #
bpulv
Loc: Buena Park, CA
btaylor356 wrote:
What is difference between telephoto and zoom lens?
On a full frame camera, 50mm is considered a normal lens because it neither magnifies or compress the image. It's angle of view is about 45 degrees. A telephoto lens is a lens that magnifies the image and brings it closer. It's angle of view is more than 45 degrees.
And a wide angle lens is a lens that has an angle of view greater than 45 degrees. There are also ultra-wide angle lenses that have an angle of view greater that 90 degrees.
A zoom lens is a variable focal length lens. A zoom lens can be a telephoto zoom, such as a 70-200mm lens, a wide angle zoom, such as a 17-35mm lens, or a lens that can go from wide angle through normal to telephoto, such as the Nikon 28-300mm DX lens.
Dec 16, 2017 14:46:26 #
bpulv wrote:
On a full frame camera, 50mm is considered a norma... (show quote)
ALL cameras are full frame. If you refer* to 24x36 just say so, not the misleading 'full frame'.
-----
* Misspelling corrected.
Dec 16, 2017 14:53:16 #
bpulv
Loc: Buena Park, CA
Rongnongno wrote:
ALL cameras are full frame. If you reffer to 24x36 just say so, not the misleading 'full frame'.
Only someone who is both ignorant about DSLR's and anal retentive would make a comment like that. Also, "reffer" is not a word, refer is!
Dec 16, 2017 14:59:39 #
bpulv wrote:
Only someone who is both ignorant about DSLR's and anal retentive would make a comment like that. Also, "reffer" is not a word, refer is!
Pray tell... If you use any camera, is all the sensor frame used?
If so, in all your science, is a 'normal' lens length the same for all the formats used?
Then, what did your post had to add to the difference between a fixed lens and a zoom?
Reffer? You are right, I did not catch the misspelling.
I will not comment on the insults other than: Look in a mirror.
Dec 18, 2017 11:53:25 #
bpulv wrote:
On a full frame camera, 50mm is considered a normal lens because it neither magnifies or compress the image. It's angle of view is about 45 degrees. A telephoto lens is a lens that magnifies the image and brings it closer. It's angle of view is more than 45 degrees.
...
...
You might want to re-read that last sentence and make a correction. “It’s angle of view...”
Other than that, great response.
Ron
Dec 18, 2017 12:32:33 #
bpulv
Loc: Buena Park, CA
cucharared wrote:
You might want to re-read that last sentence and make a correction. “It’s angle of view...”
Other than that, great response.
Ron
Other than that, great response.
Ron
CORRECTION! The last sentence should be, ". . . It's angle of view is about 45 degrees."
Dec 18, 2017 12:50:04 #
bpulv wrote:
CORRECTION! The last sentence should be, ". . . It's angle of view is about 45 degrees."
It's = It is; Its is the possessive...i.e., "Its angle of view..."
Dec 18, 2017 12:50:48 #
Hank Radt wrote:
It's = It is; Its is the possessive...i.e., "Its angle of view..."
Dec 18, 2017 12:58:00 #
Hank Radt wrote:
A telephoto can be either a prime (fixed focal length) or a zoom (a range of focal lengths). This article might help:
https://www.naturettl.com/should-you-use-a-zoom-or-prime-telephoto-lens/
https://www.naturettl.com/should-you-use-a-zoom-or-prime-telephoto-lens/
I have a few comments about this article.
- Prime lenses are specialized, made for a specific purpose, macro, portrait, landscape, medical, ~whatever~. This specialization makes them unsuitable for general photography.
- Fixed lenses (non prime) are also produced and great walk around choices for those who use their two feet instead of a zoom lens.
Dec 19, 2017 02:41:31 #
bpulv wrote:
CORRECTION! The last sentence should be, ". . . It's angle of view is about 45 degrees."
Missed my point entirely. In the same paragraph you had just stated that a 50mm lens had about a 45 degree field of view. Then you stated that a telephoto had a field of view of MORE than 45 degrees. Not so - a tele’s field of view will be LESS than that of a 50mm. How much less is dependent on how long the tele is. You need a shorter lens to exceed the field of view of a 50mm, hence the “wide-angle” designation.
Ron
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