Gossen super pilot meter question

[Michael Ryan]

Hello All,

 

I just picked up a Gossen Super Pilot SBC light meter. I can't figure something out, so I figure this is the best place to ask this question.

 

I have a Canon 814XLS Super 8 camera. It has a varible shutter (150 and 220) and it has frame rates of 9,18,24 and 36 fps.

 

My Gossen shows frame rates and F stops, but it doesn't show shutter speeds. I looked all through the manual but I couldn't find anything on cine shutter speeds. A pal of mine says he thinks it is hard set at

1/50th of a second. Does anyone here know if that is the case?

 

He also said that a shutter set at 150 degrees at 24 fps would give me a shutter speed of 1/60th of a second, does that sound about right?

 

Is there a formula for determining shutter speeds?

 

Thanks for your help,

 

Mike

[Francis Kuhn]

Is there a formula for determining shutter speeds?

 

Thanks for your help,

 

Mike

 

Hi Mike:

 

Here's what I found on page 616 of the Ninth Edition of the ASC Manual:

 

Multiply your frames-per-second by 360, then divide that number by the shutter angle. The result is the denominator of your shutter speed (the numerator is always 1).

 

Example: You're shooting at 24fps. Multiply 24 x 360. The answer is 8640.

 

Take 8640 and divide it by your shutter angle, in this case 150. 8640 divided by 150 is 57.6.

 

57.6 becomes your denominator, so the shutter speed is approximately 1/58th (or 1/57.6 if you want to be precise).

[Laurent Andrieux]

Yes, setting the lightmeter at 1/60 s is so close to your actual camera speed thet the difference should be of about 1/10 of stop or even less... (too tired to do the exact calculation).

 

Set it at 24 fps, 1/60 s it will be just fine.