Tuesday, January 27, 2015

fotoopa D24576

Some cool flash photo images:

fotoopa D24576
flash photo
Image by fotoopa
Test setup to measure and drive the Nikon flashes via the TTL flash mode. Purpose is to control fast and remote wireless all my flashes. I need to change very quick the powerlevel of all the flashes the same time from my central control unit just by rotation on a simple buttom. I've found that even the flashes can be driven lower then the 1/128 power settings if you use the TTL mode. Now i prepare all the timings.

Wireless will be driven by the RF12B chips. This chips works on 866Mhz (also other ranges for the states are possible). Minimum range is about 50m from the controller.

I will give all the timings, diagram from the logic analyser very soon. The homemade cost for all this is very low, only a few euros! Even the soket to interface on the flashes is homemade.

Here the FPGA controller is just used for the tests. Later the full function will be integrated into my normal controller or a few AVR controllers.

For the connection details see: www.flickr.com/photos/fotoopa_hs/3715377259/
for the timing values see:www.flickr.com/photos/fotoopa_hs/3709381751/in/photostream/

Holga 6x12cm 120WPC Bedroom Flash Photo
flash photo
Image by Jarvist Frost
Holga 120WPC, slightly modified to reduce vignetting, improve light tightness, not scratch film etc.

~50 full power flashes from Vivitar 283 (manually fired). Flash got very hot + started smelling a bit wrong after 40 flashes, so I swapped to a new one.
Big Self-portrait flash was approx 25cm away, I think it was literally on the other side of the camera (out of field of view), the angle is so wide.

Kodak TMax100 film, developed in TMax 1+4 8min @ 20C, agitate every 30s as instructions. Refixed after washing as didn't seem clear.

Incidentally, this seemed to use 480mAh of current from the eneloops rechargeables (based on how much it took to recharge them), suggesting that you'd get 200 full power flashes from a charged set.