- Open Antenna
The antenna on the Flex TT5 must be opened fully in order to have a useful range.
With the antenna in the closed position the range from a Flex TT5 to the MC2 is about 5 feet, with it open it's much greater.
Wheel retracts locking pin
The wheel that clamps the FlexTT5 to the camera also raises and lowers the locking pin. If you couple two FlexTT5 units together the locking pin is spring loaded and will snap into the other unit and they will not come apart until you retrace the locking pin by turning the wheel to the right on the top unit. You can see how this works by turning the wheel on the bottom unit
Remote Shutter Release
Normal Shutter Release
Power Tracking on E640
Transmit Ch 1
||ControlTL Transmit Ch 2|
|Standard Transmit Ch 2||Standard Transmit Ch 2|
|ControlTL Receive Ch 1||ControlTL Receive Ch 2|
Receive Ch 1
||Standard Receive Ch 32|
Tracking: Full Manual
Center on ISO & Aperture w/First Shot
|Remote Flex TT5 is in
Hold TEST while power on, wait for:
1, 2, 4 LED blinks.
You can fire the E640 by pressing the TEST button on the FlexTT5.
BUT sometimes it takes a strong press of the TEST buttom to make contact.
That's to say the quality of the TEST button is not as good as it could be.
Dropping the camers+Pocket Wizard on the carpeted floor
resulted in cracking the plastic foot on the bottom of the
TT5 Pocket Wizard. This is an assembly (probably
there are different versions for Nikon and Canon flash
hot-shoes) so can easily be replaced. By rotating
the knurled knob used to lock the foot to a camera 4 (+)
screws can be removed, then the assembly can be moved a
little but it is still restrained by the flex flat cable.
The two black ears clamping the flex cable need to be
moved away from the assembly to free the cable.
E640 head with Pocket Wizard radio
E640 with 51" PLM umbrella and diffuser inside view
|Battery with Power Pole
This is a "12 Volt" battery rated at 8.8 AH.
The UBI-2590 (BB-2590) is only rated for 6.8 AH.
Notice light on floor is much larger than umbrella diameter.
The circle of light is much larger than the 22" dish
and it's harsh. Note the floor is burned to white directly
below the reflector.
The light table was showing surface
scratches. By taking a photo of just the
table with no subject using the same manual
exposure as for a subject the below image was
|Only the left bottom strobe was
||After rotating the right bottom
strobe 180 degrees so that it's photo sensor was
facing to the front it started working.
Adjusted both bottom power levels to about half
way. E640 with 54" umbrella and diffuser set
to full power. Camera M-mode, ISO: 200, 1/100,
f/29 18-200 zoom lens.
The exposure from the flash depends on the f/stop and flash brightness since the duration of the flash is very short so changing the shutter speed has little effect.
So, when there are two different light sources you can set the flash exposure independently of the other source. An example of this is when photographing test equipment (HP 66311A) where there is a self illuminating front panel display. First the flash exposure is determined then the shutter speed is slowed down until the display can be seen. In this case f/22 @ 1/2.5.
Thomas Strobemeter Model 1B
Exposure Meter for Photography, Frederick A. Thomas,
Aug 14, 1962, 356/215; 250/206; 250/214.00P;
355/68; 356/225 -
2360082 Method for Determining the Breaking Time of Stratus and Fog, N.C. Stone (Pasadena Res. Found), Oct 10, 1944,
356/72; 73/170.27; 250/214.00R; 250/573; 356/3; 356/215; 356/434; 361/175 -
Photocell measures light to predict when stratus clouds or fog will clear2588368 Light Integrator, H.E. Edgerton, Mar 11, 1952, 356/215; 73/1.56; 250/214.00R; 250/225; 250/229; 324/102 -
2633784 Photographic Printer, P.C. Cofield, Apr 7, 1953, 355/83; 356/443 -
dumb idea to control light source when printing. According to Ansel Adams (Minor White Zone System Manual) the exposure is that required to print film base as black.
This meter was designed specifically to measure the light
output of strobe flash tubes (like the GR
Strobotac), also invented by Harold
"Doc" Edgerton. The third page of figures shows
it also being used to measure the output of a flash bulb.
GR 1501 photos courtesy of Jason Hathcock.
||Fig 4 1P39
Cold Cathode Photocell
3 ea No. 455 = 3*45V = 135V.
1 ea No. 742 = 1.5 V (maybe 4 parallel "F" cells)
Light intergrator, Harold
E Edgerton, Filed: 1947-05-02, Pub: 1952-03-11,
356/215; 73/1.56; 250/229;
250/214R; 250/225; 324/102-
Harold "Doc" Edgerton - inventor of the strobe tube & Strobotac
GR Strobotac, Sonar & Krytron - 631 & 1531 Strobotac (patent for 1531 is close to the 1501 patent)
Graflex Stroboflash IV - Egerton involved in design