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Comparison Yongnuo YN-565EX vs Yongnuo YN-568EX

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Yongnuo YN-565EX
Yongnuo YN-568EX
Yongnuo YN-565EXYongnuo YN-568EX
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Typeregular (classic)regular (classic)
Camera compatibility
Canon
Nikon
Olympus
Panasonic
Pentax
Sony
Canon
Nikon
Olympus
Panasonic
Pentax
Sony
Specs
Guide number
39 /35mm, ISO 100/
58 /105mm, ISO 100/
Reload time3 с3 с
Pulse duration
1/200 c /full power/
1/200 c /full power/
TTL
E-TTL, I-TTL /mode available only for Nikon and Canon/
E-TTL, I-TTL /mode available only for Nikon and Canon/
Power management++
Beam angle24 - 105 mm24 - 105 mm
Rotary head
Head anglevertical - 97 degrees, horizontal - 270 degreesvertically - 97 degrees, horizontally - 360 degrees
Features
Features
autofocus illumination
automatic zoom
manual zoom
master mode
slave mode
Оптическая ловушка /without and with pre-flash skip/
autofocus illumination
automatic zoom
manual zoom
master mode
slave mode
Оптическая ловушка /without and with pre-flash skip/
Wireless control++
Power supply
Power source4xAA4xAA
General
Screen
Screen backlight
Added to E-Catalogoctober 2013october 2013

Guide number

The guide number is the main characteristic that describes the power of the light pulse of the flash. It is described as the maximum distance (in metres) at which, at ISO 100 and f/1 lens speed (aperture 1), a flash is able to illuminate an "average" subject sufficiently for a normal exposure; in other words, at what distance from the flash it will be possible to normally shoot the scene at the specified ISO and aperture.

There are formulas by which, knowing the guide number, you can derive the practical shooting distance for each specific value of sensitivity and aperture. The simplest formula used to calculate the distance at ISO 100 is: S=N/f, where S is the distance, N is the guide number, f is the aperture value. For example, for a guide number of 56 and an f/2.8 lens, this distance would be 56/2.8 = 20 m. Increasing or decreasing sensitivity by a factor of 2 would increase or decrease the specified distance by approximately 1.4 times, respectively. If you need to calculate the distance as accurately as possible, you should refer to more detailed formulas that can be found in specialized sources.

Separately, it is worth noting that the leading numbers of flashes, usually, are indicated by manufacturers for specific focal lengths of lenses. This is due to the fact that the shorter the focal length and, accordingly, the wider the viewing angle, the more light is needed to illuminate the scene being shot and the more powerful the flash pulse should b...e (at the same distance). Therefore, when choosing by the guide number, it makes sense to pay attention to the focal length indicated by the manufacturer and select a model with a power reserve — especially since guide numbers are often prescribed for rather “long-range” lenses (with a focal length of about 80-100 mm in equiv. 35 mm).
Yongnuo YN-565EX often compared
Yongnuo YN-568EX often compared