camera lens zoom
|
|
 May 13 2007, 05:56 AM, updated 19y ago
Show posts by this member only | Post
#1
|
 
Senior Member
9,707 posts Joined: Feb 2005 From: Why U wana know? Status: Meditating™ 
|
I don understand...
as u see one camera lens, there is 5.8-34.8mm 1:2.8-4.8 can anyone explain that? is there any calculation? what about 35-210mm equiv. 6x zoom lens? This post has been edited by chicaman: May 13 2007, 06:01 AM |
|
|
|
|
|
May 13 2007, 07:27 AM
Show posts by this member only | Post
#2
|
Senior Member
7,214 posts Joined: Oct 2006 From: Kamino 
|
the equivalent zoom values is calculated by using this formula
zoom factor = max focal length / min focal length therefore if 5.8-34.8mm that would be 34.8/5.8 = 6x zoom factor... and 1:2.8-4.8 refers to the maximum aperture the lens can go... for this matter the max the lens can go at 5.8mm is f/2.8 while at 34.8 is f/4.8... |
|
|
May 13 2007, 07:44 AM
Show posts by this member only | Post
#3
|
Senior Member
3,657 posts Joined: Jan 2003 From: My Room 
|
i'll add on,
the 35~210 mm is 135 format equivalent. this means what you'll get on a normal film camera. *i know thread starter will ask more and more questions soon... * |
|
|
May 13 2007, 10:19 AM
Show posts by this member only | Post
#4
|
|
Senior Member
9,707 posts Joined: Feb 2005 From: Why U wana know? Status: Meditating™
|
QUOTE(xandman @ May 13 2007, 07:27 AM) the equivalent zoom values is calculated by using this formula Oh, i see, i understand this now.....zoom factor = max focal length / min focal length therefore if 5.8-34.8mm that would be 34.8/5.8 = 6x zoom factor... and 1:2.8-4.8 refers to the maximum aperture the lens can go... for this matter the max the lens can go at 5.8mm is f/2.8 while at 34.8 is f/4.8...  QUOTE(exkay @ May 13 2007, 07:44 AM) i'll add on, For this , i don really understand lol....135format?the 35~210 mm is 135 format equivalent. this means what you'll get on a normal film camera. *i know thread starter will ask more and more questions soon... * |
|
|
May 13 2007, 12:55 PM
Show posts by this member only | Post
#5
|
Senior Member
1,994 posts Joined: Apr 2006 From: Sien Ga Lin 
|
1:2.8-4.8 really the aperture?
the " : " is normally not the aperture wor....  |
|
|
May 13 2007, 12:59 PM
Show posts by this member only | Post
#6
|
|
Senior Member
7,214 posts Joined: Oct 2006 From: Kamino
|
QUOTE(aichiban @ May 13 2007, 12:55 PM) 1:2.8-4.8 really the aperture? oopss...the " : " is normally not the aperture wor.... my bad... its the reproduction ratio... and at the same time... refers to the maximum aperture throughout the zoom range... This post has been edited by xandman: May 13 2007, 01:00 PM |
|
|
May 14 2007, 10:41 AM
Show posts by this member only | Post
#7
|
|
Senior Member
3,657 posts Joined: Jan 2003 From: My Room
|
|
|
|
May 15 2007, 09:42 AM
Show posts by this member only | Post
#8
|
Senior Member
1,766 posts Joined: Jan 2003 From: Klang Valley
|
Chicaman, 135 format aka 35mm. It's usually printed on a film box.
http://en.wikipedia.org/wiki/135_film |
| Change to: |  0.0140sec
 0.59
 5 queries
 GZIP Disabled
Time is now: 20th December 2025 - 07:57 PM |
Quote