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I purchased an RH-12 120 roll film back for my Super Graphic, only to discover the previous owner of the camera had removed the two slide locks and four mounting screws used to secure the adapter.
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I received this 2-cell Heiland flash with my Graflex Super Graphic camera. It has a Graflex BC module installed. I was wondering which flash bulb bases it will accept natively. without adapters? I've...

The new battery fit fine in my Heiland 2- "D" cell flash equipped with a BC adapter. The capacitor and resistor disk seem to work fine. It popped a flashbulb nicely.

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The width of the new batteries is almost identical to the old Eveready units at 1.01 - 1.02 inches:

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Don

The thickness of the batteries may be a deal breaker. The new batteries are considerably thicker than the originals (as previously reported here).

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The old batteries are a nominal .629...

My 22.5 volt carbon-zinc batteries arrived from China today. Delivery estimate was out in July, but the four batteries arrived in just under two weeks. Not bad.

Here is a lineup of the 3 old and 4...

Optical slave units have a capacitor or inductor in the circuit, wired in a way that that makes them sensitive to only a large and sudden increase in light level, regardless of wavelength. I have an...

I must apologize, I did a bit of reading and some of the flash units used with the Speed Graphic (external low voltage solenoid) did indeed power the shutter solenoid and pop the bulb using the same...

Diagram of cell stack wiring. You can see where the three pairs of cells that are wired together are used.

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Well, my 20 CR2032 lithium coin cell batteries arrived today. They were a quality Panasonic brand. Either Sony or Panasonic CR2032s should be used for this project, as their capacity is least...

I agree with you about the "Y" cord used with flashes with the alternate shutter button.

Yes, you can feed 45 volt shutter battery power via the rightmost socket hole in the camera side and the...

Some flashes did have a button to remotely fire the electronic shutter, but the power sources for the flash bulb and shutter solenoid were always separate. A special "Y" cord was used that split the...

I'll be sure to post results. I have a brief video of my hotwired shutter test here. Note how the current peaks at about 20mA when solenoid is triggered (checked with peak hold feature on meter) and...

I had an idea to make up 3 stacks of 5 each CR2032 lithium coin cells, connected in series with copper strips. The size should fit inside the battery compartment. I would fabricate a plate from...

The blue Graflex BC flash adapter has one of the 22.5 volt batteries (same as used in the Super Graphic) and a 10 Kohm resistor disk built into the battery holder to limit the current from the...

BTW, the service manual schematic notes mention there are 2-80 microfarad capacitors in the solenoid triggering circuit and two capacitors are shown in the schematic. This is misleading, as the note...

The diode in the circuit is to suppress the transient reverse voltage from the solenoid when it de-energizes. This prevents the high voltage pulse from arcing across the button's contacts and...