prime lens??


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wawasan

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Jun 27, 2008
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western Singapore
#1
hey, sorry if this qustion is stupid to some of you guys, but i sincerly wanna know what is a meaning of a prime lens?

thanks:sweat:
 

pinkbee

New Member
Feb 9, 2008
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#3
hey, sorry if this qustion is stupid to some of you guys, but i sincerly wanna know what is a meaning of a prime lens?

thanks:sweat:
Lens with fixed focal length (i.e. 50mm), which u cannot zoom.
 

J-Chan

Senior Member
Sep 21, 2005
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#4
a lens that's 20/30 years old..

jokes aside, the other 2 have already answered the qns..
 

gymak90

New Member
Jan 5, 2008
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#5
Just to add on a little bit. Prime lenses tend to have larger apertures than zoom lens. Something like 50mm F1.4.
 

MarkTan89

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Jun 30, 2007
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Boon Keng
#6
Also add a bit more, prime lenses are usually sharper than zoom lenses.
 

#9
Actually it is not simpler construction as per say. Prime only have to deal with one single focal length (eg. 50mm) thus it uses less glass elements. The less glass elements light has to pass through to the film or Image Sensor, the more clarity of the image is retained. YOu need more glass elements in zooms of various thickness and shape in order to give you that varying zoom lengths (eg..18-70mm)

As clear as you might look at a glass element with your naked eye, it is only at sub-micro level that you see tiny particles impurity or air bubbles which technology has tried it's best to eliminate as much of it but still remains bits of it to some extend and as you stack layer after layer of glass element making up that lens' varying focal length, some light fall-out and distortion or colour aberration will occur. But the good news is it is very small. By today's zoom standard compare to those in the 80s and I dare say 90s, they are much more better made. In those days...if you are a serious or pro photographer you never use zoom lens for shoots. Everyone was doing primes.
 

calebk

Senior Member
Jul 25, 2006
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Clementi
#10
Actually it is not simpler construction as per say. Prime only have to deal with one single focal length (eg. 50mm) thus it uses less glass elements. The less glass elements light has to pass through to the film or Image Sensor, the more clarity of the image is retained. YOu need more glass elements in zooms of various thickness and shape in order to give you that varying zoom lengths (eg..18-70mm)

As clear as you might look at a glass element with your naked eye, it is only at sub-micro level that you see tiny particles impurity or air bubbles which technology has tried it's best to eliminate as much of it but still remains bits of it to some extend and as you stack layer after layer of glass element making up that lens' varying focal length, some light fall-out and distortion or colour aberration will occur. But the good news is it is very small. By today's zoom standard compare to those in the 80s and I dare say 90s, they are much more better made. In those days...if you are a serious or pro photographer you never use zoom lens for shoots. Everyone was doing primes.
This is generally also why a 18-200 zoom, while convenient, is usually never very good in resolving detail.
 

samonthe

New Member
Nov 9, 2007
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#12
hey, sorry if this qustion is stupid to some of you guys, but i sincerly wanna know what is a meaning of a prime lens?

thanks:sweat:
This is not a stupid Q, i learnt something new as well :bsmilie:
 

liarliar

Deregistered
May 13, 2007
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#13
Prime lenses used less lens elements and thus chances of ghosting and flares due to dust or deflected rays from the direct sunlight is minimum or negligible. Using prime lenses for wide angle landscape shots pointing your cam directly or near a strong like source may not register flares as much as most digicam or zoom lenses.
 

Mar 18, 2008
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#14
Pardon my ignorance: with a 50mm f1.4, it means the largest aperture it could go to is f1.4, but still able to get smaller aperture(f5.6, f8, f11 etc.) to capture better DOF?
 

Mar 18, 2008
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#16
Pardon my ignorance: with a 50mm f1.4, it means the largest aperture it could go to is f1.4, but still able to get smaller aperture(f5.6, f8, f11 etc.) to capture better DOF?
 

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