How reliable are these? Will they flash at least 95% of the time if you remotely control an off camera flash? As reliable as canons 600ex?

I used two of these and a YN560-TX for a 3 1/2 hour shoot in a studio setting last night. I shot 291 images. One was set to 1/1 and fired every single time. The other one was set between 1/8 and 1/2, and also fired every single time. They both had Enloop batteries in them. The flash set to 1/1 lasted about 250 pops. There is a tome when the flash is ready and this is also a very helpful and distinct tone when the batteries are used up.

what is the difference between the yongnuo yn560 iv and the iii

YN-560 IV Flash Speedlite is a combination of YN-560 III and YN560-TX,, it has built-in wireless trigger system, so you can not only use it as flash speedlite, but also a flash controller Transmitter.YN560 IV=YN560III+YN560-TX, supports wireless master function.

Is there a RF transmitter that either has a PC sync port OR allows another flash to piggy back on hot shoe? I need to use 4x 560 IV's all as slaves.

I have the 560 IV and the yn560-tx, it fires the flash, changes zoom and power. No need for cables or external triggiers as the 560 IV is wireless with the 560-tx. Great price to.

ASIN	B00PGTOX26
Aspect Ratio	Unknown
Audio Recording	No
Battery Average Life	2 Hours
Battery Life	2 Hours
Best Sellers Rank	#83 in Shoe-Mount Flashes
Brand	YONGNUO
Built-In Media	1× Manual, 1× Mini Stand, 1× Protecting Bag, 1× Yongnuo YN560IV Flash Speedlite
Camera Flash	Slave
Color	Black
Color Temperature	5600 Kelvin
Compatible Devices	Canon, Nikon, Pentax, Olympus, Fujifilm, Panasonic digital cameras with standard hot shoe mount
Compatible Mountings	Canon, Nikon, Pentax, Olympus, Fujifilm, Panasonic etc. Digital Cameras
Connectivity Technology	Optical Pulse
Customer Reviews	4.4 out of 5 stars 2,627 Reviews
Exposure Control Type	Automatic
Flash Sync Speed	1/20000
Global Trade Identification Number	00795400109148, 06947110916385
Guide Number	58
Hardware Interface	Built-in Flash Memory
Has Self-Timer	No
Included Components	1× Manual, 1× Mini Stand, 1× Protecting Bag, 1× Yongnuo YN560IV Flash Speedlite
Iso Range	100-1500
Item Dimensions D x W x H	3.86"D x 3.27"W x 8.23"H
Item Weight	12.3 Ounces
Light Sensitivity	ISO 100
Manufacturer	Hong Kong Yongnuo Photographic Equipment Co., Ltd
Maximum Shutter Speed	1/200
Minimum Shutter Speed	1/20000
Model Name	FBA_YN560 IV
Model Number	YN560 IV
Mount Type	Hot Shoe Mount
Number of Batteries	4 AA batteries required.
Self Timer Duration	10
UPC	603338731129 795400109018 600346546653 724500190411 888418125733 708478889645 095225141829 706551141253 711463947336 712994321701 651810100963 701630946606 742790951505 711463946261 888218125735 706551142366 707581260044 754235385264 745780827842 701385665753 706551142083 701413954460 795400109148 711463939584 651810103858 601629734255
Warranty Description	1 year
Water Resistance Level	Not Water Resistant
Wireless Technology	Optical Pulse

YONGNUO YN560 IV Speedlite 2.4GHz Wireless Flash Strobe

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