I am having trouble understanding what exactly is the what 1/2.3" CMOS is??? How do you interpret that number fraction? is it a 1/2 inch plus .3 inches??? what is it and why don't they use the metric system for sensor sizes as they do with other camera measurements???
google this and there are several charts that show the differences in censor size.
medavis43 wrote:
google this and there are several charts that show the differences in censor size.
Yes I know the physical difference in size, but how do I interpret the numerical size of 1/2.3"?
Racmanaz wrote:
Yes I know the physical difference in size, but how do I interpret the numerical size of 1/2.3"?
divide 1 by 2.3?
my favorites are 1/2 frame, 1/2 frame of what and four thirds. Again, 4 thirds of what and what is the other dimension?
Racmanaz wrote:
I am having trouble understanding what exactly is the what 1/2.3" CMOS is??? How do you interpret that number fraction? is it a 1/2 inch plus .3 inches??? what is it and why don't they use the metric system for sensor sizes as they do with other camera measurements???
The numbers you are so concerned about go back to the early days of the television industry when TV studio cameras used Orthicon tubes as the image target. The numbers you mention refer to the diameter of the glass tube which contained the Orthicon's electronic parts. You seem to already have the dimensions you seek, so stop worrying over some archaic numbers.
PhotoMan1929 wrote:
The numbers you are so concerned about go back to the early days of the television industry when TV studio cameras used Orthicon tubes as the image target. The numbers you mention refer to the diameter of the glass tube which contained the Orthicon's electronic parts. You seem to already have the dimensions you seek, so stop worrying over some archaic numbers.
I'm not worried about any numbers, I am seeking the knowledge of what those numbers mean specifically. If you don't ask you don't learn.
Racmanaz wrote:
I'm not worried about any numbers, I am seeking the knowledge of what those numbers mean specifically. If you don't ask you don't learn.
Good on you! In sensors, SIZE matters! Its all about the sensors, the numbers are just like names.
Racmanaz wrote:
.....why don't they use the metric system for sensor sizes as they do with other camera measurements???
Way back in the 1910's they would split 70mm stock film down the middle, add perforations and use it for the format we call 135, FX or full frame.
When people ask me what size sensor my D800 has i just smile proudly and say "It a half frame but it takes great pictures
oldtigger wrote:
Way back in the 1910's they would split 70mm stock film down the middle, add perforations and use it for the format we call 135, FX or full frame.
When people ask me what size sensor my D800 has i just smile proudly and say "It a half frame but it takes great pictures
Ha ha, so most FF users are really using 1/2 frame :)
Racmanaz wrote:
Ha ha, so most FF users are really using 1/2 frame :)
FF is a reference to 135 film It could just as easily been referenced to 8x10 so us DSLR users would feel we had an itty bitty sensor.
Racmanaz wrote:
I'm not worried about any numbers, I am seeking the knowledge of what those numbers mean specifically. If you don't ask you don't learn.
The 2/3 simply refers to the outer diameter of the Image Othicon tube, 2/3 of an inch.The 1.8 simply refers to the outer diameter of the glass envelope of another size of Image Orthicon tube, 1.8 inch.
An Image Orthicon was a specialized vacuum tube, cylindrical, with a flat end where the optical image was focused, the opposite end had a series of pins that plugged into a socket in the camera. You might look it up on Wikipedia, where you will find more information than we can easily provide on this Forum
The TV industry stopped using vacuum tubes in that application sometime in the 1980's. It is nice that you are seeking information, but the information you seek has little real application to modern digital photography.
PhotoMan1929 wrote:
...... It is nice that you are seeking information, but the information you seek has little real application to modern digital photography.
There are those who know the names of their children, some know that of the current president and other such worthless crap but there are those of us who acquire knowledge just for the pure joy of it.
Allow us to misbehave as it were, we are harmless and if it were not for those who sought beyond the bare essentuals of survival there would not be any photography for any of us to fret over.
n3eg
Loc: West coast USA
FF is full frame, APS/DX is half frame, and 4/3 is quarter frame. Or you could call four thirds 1/0.75 if it makes Racmanaz feel better...either way, I call 1/2.3 tiny.
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