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Thread started 03 Feb 2018 (Saturday) 10:43
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Shutter Speed

 
s1a1om
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Feb 03, 2018 10:43 |  #1

I've always pictured cameras controlling the shutter speed with the use of little electric motors or servos. How was the shutter controlled before electrical components were added to cameras? I envision them using a spring, but I would think that would only allow a single shutter speed?

Any insight would be appreciated.


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chrisa
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Feb 03, 2018 13:52 |  #2

I thought it was the size of the gap in the curtain as it moved across the opening that controlled the speed.




  
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Archibald
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Feb 03, 2018 13:58 |  #3

chrisa wrote in post #18555590 (external link)
I thought it was the size of the gap in the curtain as it moved across the opening that controlled the speed.

Yeah, that's how focal plane shutters work.

Leaf shutters use a gear-driven governor to control shutter speed.
http://camerapedia.wik​ia.com/wiki/Compur (external link)


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Wilt
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Post edited 3 months ago by Wilt. (3 edits in all)
     
Feb 04, 2018 09:39 |  #4

Before electronic control of shutter speed, there were tiny timer gears.


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http://cdn.ipernity.co​m …49111.6b0cd385.​640.jpg?r2 (external link)


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Feb 04, 2018 10:17 |  #5

---
damn:-
my view of the 'magical & mysterious' world of photography has now, sadly changed!
:cry:


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King ­ Kenny
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Feb 04, 2018 10:32 |  #6

[QUOTE=Wilt;18556051]B​efore electronic control of shutter speed, there were tiny timer gears.

Before that the photographer simply removed the lens cap and used a stop watch for timing.


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RDKirk
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Feb 14, 2018 08:42 |  #7

Or tiny cams to set the speeds faster than 1/60 (which was the flash sync speed for most 35mm focal plane cameras up into the early 80s).




  
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Wilt
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Feb 14, 2018 11:23 |  #8

[QUOTE=King Kenny;18556085]

Wilt wrote in post #18556051 (external link)
Before electronic control of shutter speed, there were tiny timer gears.

Before that the photographer simply removed the lens cap and used a stop watch for timing.

Stop watch?! Man, that is a whole lot of bother to time something that you can count.


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Feb 14, 2018 11:30 |  #9

Wilt wrote in post #18563633 (external link)
Stop watch?! Man, that is a whole lot of bother to time something that you can count.

Mannes and Godowsky, developers of Kodachrome, were musicians. They timed their development steps by counting measures of music. A march typically goes by at one measure per second.

So you just need to hum your favorite Sousa march and hope you don't get so enthralled with the tune that you forget to close the shutter.


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RDKirk
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Feb 15, 2018 08:35 |  #10

I wish modern cameras gave us the option of turning on low gear whirr sound for longer shutter speeds.




  
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Feb 15, 2018 08:53 |  #11

RDKirk wrote in post #18564295 (external link)
I wish modern cameras gave us the option of turning on low gear whirr sound for longer shutter speeds.

I doubt there is much demand for that feature!


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RDKirk
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Feb 15, 2018 08:56 |  #12

Archibald wrote in post #18564305 (external link)
I doubt there is much demand for that feature!

Well, we have an optional clicks and beeps.

I just want a whirr.




  
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gjl711
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Feb 15, 2018 09:05 |  #13

s1a1om wrote in post #18555454 (external link)
I've always pictured cameras controlling the shutter speed with the use of little electric motors or servos. How was the shutter controlled before electrical components were added to cameras? I envision them using a spring, but I would think that would only allow a single shutter speed?

Any insight would be appreciated.

chrisa wrote in post #18555590 (external link)
I thought it was the size of the gap in the curtain as it moved across the opening that controlled the speed.

The shutter always moves at a fixed speed whether it's 1/80 or 1/8000 and as chrisa points out, the only thing changing is the size of the opening. For a great video, check out this (external link).


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RDKirk
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Feb 15, 2018 09:43 |  #14

gjl711 wrote in post #18564313 (external link)
The shutter always moves at a fixed speed whether it's 1/80 or 1/8000 and as chrisa points out, the only thing changing is the size of the opening. For a great video, check out this (external link).

If you go 'way back, the Speed Graphic cameras (not the Crown Graphic) had both front leaf shutters and a rear focal plane shutter. The focal plane shutter was a long roll of rubberized silk that had a series of openings of different sizes, each size representing a shutter speed. You wound the shutter to set the correct opening for the speed you wanted.

Such ingenuity.

http://www.artfuldance​r.com …_SpeedGraphic_S​hutter.gif (external link)




  
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Shutter Speed
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