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Old April 17th, 2012, 10:07 PM   #1
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EX1R - 1/30th Second Shutter Speed?

Playing with my EX1R tonight and I just realized that I can't seem to set a concrete 1/30th shutter speed.

Running at a "30p" frame rate and a 360 degree shutter seems to be identical brightness compared to 60i at 360 degree shutter. Wouldn't a 60i = 1/60 shutter and a 30p = 1/30 shutter if they were both set at 360 degrees?

Setting a slow x2 shutter seems to collect frames per second and give a 1/15th choppy FPS look.

My question is this: Can the camera run at 30p and capture at a 1/30 shutter? If so, I should see a brighter image than a 1/60 shutter speed.....no?

It's funny, of all the Sony cameras I have owned, the EX1R is the only one that is slightly ambiguous. It doesn't give a simple 1/15 or 1/30 or 1/60 on the screen like any other does.

Maybe I'm missing something?

CT
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Old April 18th, 2012, 06:57 PM   #2
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Re: EX1R - 1/30th Second Shutter Speed?

I believe that when you set the shutter angle to 180 in a 1080 30p mode you are at 1/60 sec.
Now go to the front camera buttons, switch shutter off you will be at 1/30 sec. shutter speed.
Nothing will display that, but there you will be. Notice the extra stop gained in viewfinder when switching shutter off.
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Old April 18th, 2012, 07:29 PM   #3
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Re: EX1R - 1/30th Second Shutter Speed?

I solved the mystery.

From what I can tell, running at 60i will not give me 1/30 shutter speed. Even when I select an x2 slow shutter option, (seems to drop the shutter down to 1/15 instead)

When running at 30p. There is a solid light difference when setting the shutter to 1/60 and then disabling the shutter option. This appears to give the true 1/30 shutter speed that I'm looking for. (and the light advantage)

I find it odd though. Other Sony cameras that shoot in 60i will give a 1/30 shutter speed option. (I guess this amounts to something similar to PSF) It scans the sensor(s) at 30 times per second and simply "slices" each image into top and bottom fields and generates a "simulated" 60i video from it. (as opposed to a "true" 60i image where each field represents separate moments in captured time)

I'm still learning something new everyday!
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Old April 19th, 2012, 02:36 AM   #4
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Re: EX1R - 1/30th Second Shutter Speed?

Apparently 720 modes are more sensitive than the 1080 modes. 1280/30p is more sensitive than 1920/30p. That could be worth a shot.
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Old April 19th, 2012, 09:01 AM   #5
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Re: EX1R - 1/30th Second Shutter Speed?

Paul is right, switch the shutter off to get the native shutter speed.
I don't know is 720p is more sensitive then 1080p, but 1080i is an EX1's most light sensitive mode.
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Old April 19th, 2012, 12:18 PM   #6
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Re: EX1R - 1/30th Second Shutter Speed?

In my experience, 720p is more sensitive than 1080. 1280/24p is 10% brighter than 1920/24p at max gain.
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