Ilex Acme Synchro Shutter

The Ilex Acme Synchro Shutter is designed for use with flash bulbs. The shutter sync is adjustable with a a slotted slider mounted on the side of the barrel. The sync is mechanical, and is activated by a separate lever.

The syncronization is set as follows:

Time (ms) Dot Color Description

0 red X (electronic flash)

5 white F (gas filled flash bulbs)

20 blue M (wire-filled flash bulbs)

23 yellow S (large slow flash bulbs)

Time (ms)	Dot Color	Description
0	red	X (electronic flash)
5	white	F (gas filled flash bulbs)
20	blue	M (wire-filled flash bulbs)
23	yellow	S (large slow flash bulbs)

Shutter cocking and release are done with two separate levers. Focus viewing is accomplished with the press-style focus lever.

The rim is metal, and the front is black with white markings: two concentric rings, the ``ILEX'' company logo, and ``Ilex No 3 Synchro Shutter'' in a sans-serif art deco font.