Is sensor size measured diagonally?

Jothi said:

Plz can you tell me what are measured diagonally and what are measured vertically ? (the sensor sizes [if possible, all of 'em] )

Click to expand...

The short answer: none of them.

As previous posters have explained, sensor size designations like "2/3 inch" aren't based on any actual physical dimensions of the sensor measured in any direction.

Jothi said:

35 mm, 1 inch, four thirds, 1/2.3, 1/1.2....... .. Are they the diagonal lengths of the sensors?

Click to expand...

Haven't read all of the posts so sorry if this link was already posted:

http://www.techhive.com/article/2052159/demystifying-digital-camera-sensors-once-and-for-all.html

Sky

Jothi said:

Oh! guys.. it seems like you all running off the track...

Plz can you tell me what are measured diagonally and what are measured vertically? (the sensor sizes [if possible, all of 'em] )

Click to expand...

Perhaps if I refer you to my original post, and you take the time to read the Wiki link (scroll well down to read the list of sensors sizes), your question may be resolved...

http://www.dpreview.com/forums/post/56987139

Jothi said:

Oh! guys.. it seems like you all running off the track...

Plz can you tell me what are measured diagonally and what are measured vertically ? (the sensor sizes [if possible, all of 'em] )

thanks...

Click to expand...

35mm refers to perforated film, a roll of that was 135mm in total width in the 1920's. There is not a single dimension that accurately reflects diagonal (43mm), width(36) or height(24) in the description. It's FF or FX format today.

Believe you will find that with most of the sensor sizes, 1". There is nothing 1" about it. Nikon calls it CX format.

DX format, two exist. One for Canon another for Nikon.

As far as I am concerned there is no answer to your question, just confusion awaits you, because we have marketing people involved in the information stream.

Here is another link to sensor sizes, if you discover a logical structure in there related to a marketing description let me know.

https://www.google.com/search?q=sen...obile&ie=UTF-8&hl=en-US#imgrc=M5E-FaGtf8LS6M:

Jothi said:

Oh! guys.. it seems like you all running off the track...

Plz can you tell me what are measured diagonally and what are measured vertically ? (the sensor sizes [if possible, all of 'em] )

thanks...

Click to expand...

Please do yourself a favor and go to the link in my earlier reply. The page there explains exactly where the designations come from - they are measured neither diagonally nor vertically.

Ah! I see... the vidicon tubes.. yes.. so what about 35 mm, 645 and APS-C ? btw what is 645?

And can you clarify me about 35mm film and FF format sensor? Why is the 35mm film called so? Is it the horizontal length of a frame? and what is 135 mm? And, the FF digital sensor is wider and larger than a film frame, right?

P.S. and can you tell me about the vidicon tubes and their sensors?

six34sigma said:

DX format, two exist. One for Canon another for Nikon.

Click to expand...

No, there are two APS-C sizes - nominally 1/1.5 FF size (used not just by Nikon but almost every other maker) and 1/1.6 FF size used by Canon.

To avoid this confusion between itself and its main rival (I believe) Nikon introduced the term DX to get rid of the 1.5 v 1.6 problem. But no other maker uses DX.

Jothi said:

Ah! I see... the vidicon tubes.. yes..

so what about 35 mm, Why is the 35mm film called so?

Click to expand...

Please read what several people have already explained: cine used (and still uses) film 35mm wide - that's the width of the film, not of any part of the image recorded on it.

Jothi said:

and what is 135 mm

Click to expand...

No such thing. 135 (without mm) is just a name for 35mm film.

Jothi said:

btw what is 645?

Click to expand...

645 is a frame size nominally 6cm x 4.5cm (actually slightly smaller than that).

Jothi said:

And can you clarify me about 35mm film and FF format sensor? Is it the horizontal length of a frame?

Click to expand...

Once more: the film (sometimes but not always called 135 film) is 35mm wide. It has two rows of holes for the film-advance sprockets. The space between those holes leaves room for a frame dimension of 24mm with a little bit to spare. That determines one side of the 35mm film format; the other side was chosen to be 36mm. There is no link between the width of the film (35mm) and the frame side that could easily have been chosen as 24mm, 25mm, 30mm, 35mm, 36mm, 40mm or anything else.

Jothi said:

And, the FF digital sensor is wider and larger than a film frame, right?

Click to expand...

Wrong. FF sensor is exactly the same - 24 x 36mm - as the 35mm film frame deliberately so that lenses made for the full frame of the 35mm film can be used to cover the full frame of the sensor.

Jothi said:

Ah! I see... the vidicon tubes.. yes.. so what about 35 mm, 645 and APS-C ? btw what is 645?

And can you clarify me about 35mm film and FF format sensor? Why is the 35mm film called so? Is it the horizontal length of a frame? and what is 135 mm? And, the FF digital sensor is wider and larger than a film frame, right?

P.S. and can you tell me about the vidicon tubes and their sensors?

Click to expand...

Is this some kind of joke? Your questions has been answered already.