Constant volume zooms..

generik · 20th January 2005

Are all L lenses constant volume zoom lenses?

Just curious

mervlam · 20th January 2005

Originally Posted by generik

Are all L lenses constant volume zoom lenses?

Just curious

no

The message you have entered is too short. Please lengthen your message to at least 10 characters.

theITguy · 20th January 2005

The 100-400 dun think is constant? L means more for use of special lense that makes the overall quality higher. But most if not all L are constant.

majere2sg · 20th January 2005

What do you mean by constant volume ? You mean internal focusing and internal zooming ?
besides.. not all L lens are zoom lens..

loupgarou · 21st January 2005

he probably means that means the maximum aperture is the same for both ends of the zoom range

generik · 21st January 2005

No.. I read somewhere that some zoom lenses when you zoom, the lens barrel doesn't extend at all. So the air volume within the lens is constant. Supposedly it is good cos it doesn't suck air in and out

moos blues · 21st January 2005

i think
24 - 70 is not
100 - 400 is not
28 - 350 is not i think

and some older L's...
old 50 - 200
old 100 - 300

dkw · 21st January 2005

Originally Posted by generik

No.. I read somewhere that some zoom lenses when you zoom, the lens barrel doesn't extend at all. So the air volume within the lens is constant. Supposedly it is good cos it doesn't suck air in and out

Any lens, prime or zoom, as long as it needs to move glass elements back and forth internally for focussing and/or zooming, with shift air. Pick up your 50/1.4 and see if there is any dust inside, you betcha there is!

Just an urban myth to be best ignored!

StreetShooter · 21st January 2005

I think it's just a matter of degree.

Constant volume zooms shift air internally, while the non constant volume zooms have air coming in and out of the lens from the atmosphere.

It doesn't take a PhD to realise that one will be more likely to introduce dust into the lens than the other.

Not just an urban myth, I think it DOES make a difference.

Some lenses are also environmentally sealed.

theITguy · 21st January 2005

It also depends on lense also... Although my 100/2 is internal focusing, it collect a good amount of dust compared to my 50 and 24.

20th January 2005	#1
generik Member Join Date: Dec 2004 Posts: 292	Constant volume zooms.. Are all L lenses constant volume zoom lenses? Just curious

20th January 2005	#4
majere2sg Senior Member Join Date: Mar 2003 Location: Singapore (SengKang) Posts: 2,992	What do you mean by constant volume ? You mean internal focusing and internal zooming ? besides.. not all L lens are zoom lens.. __________________ -Express yourself not in words- Majere2sg's Digital Photography

20th January 2005	#3
theITguy Senior Member Join Date: Sep 2003 Location: In this small world Posts: 2,042	The 100-400 dun think is constant? L means more for use of special lense that makes the overall quality higher. But most if not all L are constant.

21st January 2005	#5
loupgarou Member Join Date: Sep 2003 Posts: 1,794	he probably means that means the maximum aperture is the same for both ends of the zoom range

21st January 2005	#7
moos blues Member Join Date: Nov 2003 Location: Pasir ris Posts: 681	i think 24 - 70 is not 100 - 400 is not 28 - 350 is not i think and some older L's... old 50 - 200 old 100 - 300

21st January 2005	#9
StreetShooter Moderator Join Date: Jan 2002 Location: Katong Posts: 4,702	I think it's just a matter of degree. Constant volume zooms shift air internally, while the non constant volume zooms have air coming in and out of the lens from the atmosphere. It doesn't take a PhD to realise that one will be more likely to introduce dust into the lens than the other. Not just an urban myth, I think it DOES make a difference. Some lenses are also environmentally sealed.