how to calculate the number of times a zoom is?


Status
Not open for further replies.

Paul_Yeo

Senior Member
Feb 27, 2004
2,155
0
0
Sengkang
www.boo.sg
#1
how to many the zoom in mm to the "x" one?

eg, what is 12x zoom equivalent to? 12x = 300mm??

actually, how to calculate one?
 

Jun 27, 2002
3,802
0
0
here
www.9frames.com
#2
take the most tele end of the zoom divide by the the widest end.

55-200mm = 200/55 = 3.63 zoom

35-350mm = 350/35 = 10 zoom

28-135mm = 135/28 = 4.8 zoom
 

mpenza

Senior Member
Jan 18, 2002
12,938
0
0
Singapore
www.instagram.com
#3
Paul_Yeo said:
how to many the zoom in mm to the "x" one?

eg, what is 12x zoom equivalent to? 12x = 300mm??

actually, how to calculate one?
depends on the widest angle. there's no fixed value for cameras.

it's different for binoculars where the base is 50mm.
 

blurblock

Senior Member
May 30, 2003
3,827
0
0
ytphoto.clubsnap.org
#4
Paul_Yeo said:
how to many the zoom in mm to the "x" one?

eg, what is 12x zoom equivalent to? 12x = 300mm??

actually, how to calculate one?
Use your longest end and divide by the widest end .... for example .... 28 - 300 = 300 / 28 = 10.7 = 11x
 

espn

Deregistered
Dec 20, 2002
21,905
0
0
Planet Nikon
#6
Paul_Yeo said:
OK got it! thanks

so my lens is
24-120 => 120/24 = 5x zoom
70-300mm => 300/70 = 4.2X zoom
Yeah, but pretty useless to calculate in zoom factor.

Your 70-300 is longer reach than your 24-120VR and yet it's only 4.2x vs 5x.
 

dkw

New Member
Dec 10, 2003
1,051
0
0
CCK
Visit site
#9
Paul_Yeo said:
OK got it! thanks

so my lens is
24-120 => 120/24 = 5x zoom
70-300mm => 300/70 = 4.2X zoom
As ESPN says, for SLR lenses, is a pretty useless measure. More relevant to talk about focal lengths.
 

Paul_Yeo

Senior Member
Feb 27, 2004
2,155
0
0
Sengkang
www.boo.sg
#10
so, it is more for compact camera huh.

i asked bcos i saw one Panasonic camera got 12x zoom.... that;s why me asked what's the "mm" equvialent loh. ;p
 

#11
Paul_Yeo said:
so, it is more for compact camera huh.

i asked bcos i saw one Panasonic camera got 12x zoom.... that;s why me asked what's the "mm" equvialent loh. ;p
if you meant the panasonic fz20, its a 36-432mm lens (35mm equiv) lens. It is actually only 6-72mm but can achieved 36-432mm (35mm equiv) due to the 6x cropping from a smaller sensor size.
 

Status
Not open for further replies.
Top Bottom