Mislaid Info for Bolex H8RX

Post by **Old Uncle Barry** » Tue Aug 28, 2007 8:58 pm

I am trying to track down information regarding the exposure alteration that is required for this camera.Silly me lost the one I had :oops:
Does anyone have the information at hand and can pass it on?
Thanks in advance.

Post by **sciolist** » Tue Aug 28, 2007 9:56 pm

The table on the inside cover of the instruction booklet for the H8 RX gives exposure times for various camera speeds. With the shutter fully open, "adapted" exposure times are 1/40th at 12f/s, 1/55th at 16f/s, 1/60th at 18f/s, 1/80th at 24f/s, 1/110th at 32f/s, 1/160th at 48f/s, and 1/220th at 64f/s. Single frame "adapted" exposures are 1/40th.

Post by **Janne** » Tue Aug 28, 2007 11:13 pm

Post by **super8man** » Wed Aug 29, 2007 3:09 am

Thanks Janne,

That's even more detailed than what came with my H8Rex though I guess you could say I don't need the other information on the Rx instructions...

I used these shutter settings with my external Soligor II spot meter and the shots came out bang on - even used the shutter at 1/4 and 1/2 at times. No worries.

It was funny cause I thought for sure the film would come out underexposed, but not so. The shots came out perfect - except for the one time I forgot to stop down the preset lens - something that you never think about in super 8. I highly recommend the 8-32 vario switar - a wonderful lens that has a neat feature that once you start to press the shutter, it automatically stops down the lens...

Post by **Old Uncle Barry** » Wed Aug 29, 2007 2:04 pm

Thanks all,thats helped me immensly

Post by **ronnoco** » Wed Aug 29, 2007 3:18 pm

I was fortunate enough to be given a Bolex H8 recently. Its the Rex 3..

I have since acquired a motor for it which I believe to be a Unimotor B..introduced around 1968 acccording to the 'Bolex Collector website'.

Thing is, it did not come with the battery pack or voltage regulator...which I dont think is a problem if I can make up my own power pack.

There is nothing on the motor to indicate whether it uses AC or DC current...

Could anyone help me out that knows for sure whether the motor is AC or DC so that I dont damage it.

Many thanks

Post by **clivetobin** » Mon Sep 24, 2007 4:04 am

ronnoco wrote: ...Could anyone help me out that knows for sure whether the motor is AC or DC ...

The old Unimotors that I am familiar with will run on either AC or DC, they are series wound Universal motors. They used to have a chart on the back telling you what voltage to use for what speeds with both an H8 and H16 camera.

I don't think I have had a Unimotor B in here, especially one requiring an external voltage regulator, so this may no longer be true. I don't know if this is much help.

Post by **ronnoco** » Mon Sep 24, 2007 12:52 pm

Hi Clive

Thanks for your response....yup there is indeed a plate on the side of the motor indicating voltage required for the different frame rates...but as I say no indication of whether power should be AC or DC...

12 volts will allow 12 to 16 fps, 18 volts will allow 18 to 32 fps..and so on
The plate indicates 0.5 A ...for current.

Originally they came with a transformer (BE-22)..I called it a voltage regulator..this allowed you to select the variable output for the different frame rates...I was pretty sure the motor uses AC power...but you are probably right and it will run on either AC or DC current...I just dont want to damage the motor so wanted to be as certain as possible before putting together my own power pack.