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K800-C702 LENS Difference |
bishshoy007
Joined: Dec 11, 2007
Posts: 146
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I was just browsing through the C702 pics. This pic as was shot:
C702
says the the following tag on the circumference.
f=4.2mm 1:3.2
K800
but the K800s have the following tag.
f=5.2mm 1:2.8
I want to know what is the difference in these two tags. Is it that the focal length of the K800>C702. What is about the ratio?
[ This Message was edited by: bishshoy007 on 2008-11-04 16:58 ] |
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AbuBasim
Joined: Nov 04, 2005
Posts: > 500
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The ratio is the focal width, the size of the aperture.
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crossmatched
Joined: Jan 05, 2006
Posts: > 500
From: RP
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C702 has a smaller (vs k800) aperture. Therefore, lesser light goes in/absorbed by the cam sensor
www.secondmanonthemoon.blogspot.com
we are all works under progress |
Bialynia
Joined: Jun 13, 2008
Posts: 337
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On 2008-11-03 11:43:12, bishshoy007 wrote:
I was just browsing through the C702 pics.
says the the following tag on the circumference.
f=4.2mm 1:3.2
but the K800s have the following tag.
f=5.2mm 1:2.8
I want to know what is the difference in these two tags. Is it that the focal length of the K800>C702. What is about the ratio?
The k800i has the better, larger lens which allows in more light and will result in better pictures in lower light settings then the c702. |
lukechris
Joined: Dec 30, 2007
Posts: > 500
From: Preston, UK
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So it's better to have more/less light going into the lens?
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number1
Joined: Sep 12, 2007
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From: UK,kent,Sittingbourne
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The c702 has the smaller focal length allowing more light to reach the sensor.
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Bialynia
Joined: Jun 13, 2008
Posts: 337
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On 2008-11-03 18:44:13, number1 wrote:
The c702 has the smaller focal length allowing more light to reach the sensor.
You've got that backwards, the K800 has the lower focal length allowing more light to reach the sensor, and yes, that is better.  |
bishshoy007
Joined: Dec 11, 2007
Posts: 146
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Dont get it yet.
What is the f=x.x mm ?
Is it better to have more x.x mm or less?
What is the ratio? Aperture?
What is it? Is smaller values (1: x.x) better? @number1
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centur
Joined: Jun 10, 2007
Posts: > 500
From: Bulgaria
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Original size: 
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bishshoy007
Joined: Dec 11, 2007
Posts: 146
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Centur
Thank you for the back photo of the K800. Other users will have no confusion about the tags. But any info about it. Plz post. |
number1
Joined: Sep 12, 2007
Posts: > 500
From: UK,kent,Sittingbourne
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Smaller focal length is better and allow's more light in please read
http://en.wikipedia.org/wiki/Aperture
under In photography to the right is a disgram that clearly explains the focal lenght.
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bishshoy007
Joined: Dec 11, 2007
Posts: 146
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centur
I have re-edited my first post and the pics are to the correct scale.
number1
Thank you for the link. I will try it now. |
bishshoy007
Joined: Dec 11, 2007
Posts: 146
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Yes number1, you are right. I now know that smaller the focal length, there are provisions for more incoming light. At wikipedia every terms are shown like this f/5 or f/3. But none of these notations are there in the tags of both the phones. I suppose then the must be f/4.2 for C702 and f/5.2 for the K800.
Then again what avout the ratios. 1/x.x |
number1
Joined: Sep 12, 2007
Posts: > 500
From: UK,kent,Sittingbourne
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Thats correct f/4.2 focal length of 4.2 for the c702 & 5.2 for the k800, the smaller focal length will also give a more wide angle picture, i'm not sure about aperature the focal length and aperature go together.
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Raiderski
Joined: Jul 03, 2006
Posts: > 500
From: Poland, Hell, Mountains
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you're misleading two things which are focal length and aperture size. simplest possible, and to be honest not very nice, explanations are:
1. focal length controls angle of view and zoom. shorter length = wider angle of view, longer length = narrow angle of view (which also means big zoom)
2. aperture size controls amount of light reaching the sensor. bigger value = less light
both values are constant which means no fun - no zoom, no aperture size vs. shutter speed combinations
should I include pictures as examples?
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Posted: 2008-11-03 11:43
