Primož Jakopin, photo diary

Skednena jama Cave
Test of Radio Flash Triggers Yongnuo RF605C
May 6, 2015, 16 pictures

Images are approximately 533 x 800 in size, numbers in front of picture descriptions are serial numbers of the original photo files.

All pictures photo and copyright (c) Primož Jakopin 2015.


25557. Triggers are small, maybe just twice wider than Metz Mecalux 11 optical triggers, the price is reasonable, triggers are sold in pairs. They can be used as transmitters or receivers or both, use two AAA batteries. Unlike optical triggers they do not have a tripod mount on the lower side, but a male hot shoe connector. To be mounted on a tripod some interface is needed, an optical trigger will do. In the picture three triggers are shown, used during the test. The first is set to transmit mode (TX), the other two to transmitter/receiver mode (TRX). Two Canon Speedlite 430 EX flash units were also used, and the camera Canon 100 D, fitted with the standard zoom lens.



Main Tunnel


25537. The camera is on a tripod at the beginning of the flat part of the main tunnel, some forward of the Kapelica / Chapel tunnel, opposite the entrance of a low, dug out small side tunnel; it is turned north, along the tunnel. First exposure - transmitter is on the camera, flash with a receiver is about 20 m further north, hidden behind the bend or better, in a side niche below a chimney, at the left side. Flash fired.



25536. Repeated exposure, with an additional flash and a receiver in author's hands, at the right side of the photo.



25538. An exposure where the first flash has been moved from below the chimney to behind the bend, in front of the entrance of a side tunnel, about 75 m far. The other flash was put on a rock, to the right of the camera. Only the second flash fired, the first did not. Too far, radio signal too weak.



25539. Repeated photo, the first flash was moved more to the center of the tunnel, at the distance of about 60 m (measured with long steps). Both flashes fired. The manufacturer's estimate of the maximal range is 100 m.



25541. View of the entrance to Side tunnel. The distance is about 10 meters, receiver and flash are on a tripod, about 3 meters inside the Side tunnel. Flash fired.



25543. Repeated exposure with an aperture more open and with a higher ISO value



25542. Another flash was added to the north of the tunnel entrance, on a large rock. It was mounted on a small support that comes with the flash.



25544. Not only modern technology was applied. In the morning the preparations were rather hurried and the second and the third tripod were nowhere to be found. Just the depicted one came to sight, from the time around WWII. It looks clumsy but can be adjusted to proper position very quickly, even without changing tripod leg length, just by moving them. It folds to very small size, only the weight is not so minimal as we are nowadys used to. The exposure time was 2 seconds, to catch the red blink of a front flash infrared sensor. All flashes were set to slave mode, which disables the sleep mode after one minute.



Photos, taken with daylight follow, not part of the test, but are here because it is springtime
Northern entrance


25545. View from the inside



25546. Someone made half a circle out of the forest greenery. Because of high cave humidity and water drops falling from the ceiling the cut plants persisted and some even turned their leaves upwards.



25547. Devastation on the other side of the collapse - true dimensions of the February 2014 sleet are visible only now, when a lot of trees, deciduous and conifers that barely survived last year, decided that they have had enough.



Southern Entrance


25548. View from the inside, made from three successive exposures with different settings (HDR) to get better detail in the highlights and in the shadows



25549. View from the outside, entrance in the surroundings of spring's tender green hues



Jama dvojčka Cave (Cad. nr. 2915)


25551. A good part of the northern entrance is covered with a green canopy ...



25550. .. while the southern entrance is almost completely hidden. Is out of sight until it is (very) late.



  Wooden Ladder for the Galacijevka Cave, Part II, April 8     Rakov Škocjan, Second Test of Flash Triggers Yongnuo RF605C, May 12  

This page and most of the photos by Primož Jakopin; send inquiries and comments to primoz jakopin guest arnes si (insert dots and at sign as appropriate). Page initiated on May 7, 2015; date of counter reset and last change: February 25, 2017.