All newbie/starter entry level DSLR information

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Well the S3IS sensor is smaller than a regular DSLR sensor size thats why :)

The 1.6 FLM is only applicable for Canon DSLRs & Canon S3IS is not a DSLR. Its a prosumer camera.
 
Full frame dslrs (canon 5d, nikon D3, sony a850 etc) have a sensor of 36mm. The smaller (and more affordable) aps-c dslrs have sensors either 1.6 (for canon) or 1.5 (for nikon) times smaller. i.e. 22.5mm for canon and 24mm for nikon.

Regular p&s cams have much smaller sensors. If the s3is has a multiplier of 6, it means the sensor is 6mm wide.
 
zhopudey said:
Regular p&s cams have much smaller sensors. If the s3is has a multiplier of 6, it means the sensor is 6mm wide.
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that's not correct :tongue:

Focal Length Multiplier (or Lense Multiplier Factor) is the ratio of 43.3 (diagonal size of 35mm film) by diagonal size of the sensor.

For a S3IS which has sensor of 5.75 x 4.31mm, then the diagonal of the sensor is 7.186mm, hence the multiplier is 43.3/7.168=6.02560511 ;)
 
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Parv said:
that's not correct :tongue:

Focal Length Multiplier (or Lense Multiplier Factor) is the ratio of 43.3 (diagonal size of 35mm film) by diagonal size of the sensor.

For a S3IS which has sensor of 5.75 x 4.31mm, then the diagonal of the sensor is 7.186mm, hence the multiplier is 43.3/7.168=6.02560511 ;)
Click to expand...

Thanks for correcting :)
 
Parv said:
that's not correct :tongue:

Focal Length Multiplier (or Lense Multiplier Factor) is the ratio of 43.3 (diagonal size of 35mm film) by diagonal size of the sensor.

For a S3IS which has sensor of 5.75 x 4.31mm, then the diagonal of the sensor is 7.186mm, hence the multiplier is 43.3/7.168=6.02560511 ;)
Click to expand...
Thanks buddy:)...the FLM definition cleared things up...
 
@zhopudey & harish_21_10: You're always welcome. That's the whole purpose of open forums, sharing knowledge and helping others. :)
 
Parv said:
@zhopudey & harish_21_10: You're always welcome. That's the whole purpose of open forums, sharing knowledge and helping others. :)
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Very true...

Heres another doubt, does zoom effect the depth of field for a constant Aperture setting?
Example:
blurbackground2.jpg

(Source:Google search)

Had the photographer zoomed in a little on the subject, the in focus girl, without changing the aperture setting, would it produce different result? except for the zooming part...
 
harish_21_10 said:
Heres another doubt, does zoom effect the depth of field for a constant Aperture setting?
Click to expand...

Yes it does. Cant explain how or why but it surely does.
 
@_pappu_ & SunnyBoi & Janitha : All of you are correct that result will be different and we'll have a shallower depth of field (DOF) at higher focal length but

but it's not exactly focal length which is doing the trick ;) It's the subject distance.

When we zoom in at the subject we virtually shorten the subject distance as if we have physically moved the camera/sensor near the subject.

and subject distance is directly proportional to the DOF, shorter subject distance results in shallow DOF and larger subject distance in large DOF.

@harish_21_10 : so if you zoom in at the girl in focus you will achieve shallower depth of field but you can achieve the same by moving camera closer to the girl for achieving same zoom (or subject distance) and you'll have same results*.

*there are few exceptional cases where more precise calculation is required to calculate DOF and results are different. ;)
 
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Parv said:
@harish_21_10 : so if you zoom in at the girl in focus you will achieve shallower depth of field but you can achieve the same by moving camera closer to the girl for achieving same zoom (or subject distance) and you'll have same results*.
Click to expand...
1.Its means that the focus/depth of field will shift to the gurl thats closer to the camera?
2.When u say that DOF is directly proportional to the subject distance, it means that the same girl will be in focus/DOF as the DOF is getting shallower with the zoom coming in...

What which of the above two are correct?
 
^^ I think you're not very clear about depth of field.

Depth of Field is the distance in front and behind the subject in focus (or say focus point).

So change in focal length is not going to change the focus point.
 
The LCD of most DSLR's, atleast entry level ones, only display information relating to the settings of a camera and not a preview of the image that u were to click..like its on a normal point & shoot camera...and that is what the live view feature adds to a DSLR camera...shows a preview of the photo..
 
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