Vivitar 283 under $50. good power, if you want variable output use a VP-1 that plugs into the socket for the auto sensor. Simple handle can be made from a piece of dowel with an accessory shoe glued on. GN of 110 with ISO 100 film.
Any flash whether it's rated by WS, GN, joules or furlongs per fortnight are guesses, I mean estimates. So much will depend on the design of the reflectors there is no real comparison of one brand to another.
The OP asked for a handheld flash to use with a Mamiya camera. So............ Distance X F/stop = GN. IE: 10' X 11 = 110 This has nothing to do with power into a light box/umbrella or parachute, it's simple and gives a guide not an absolute value.
Makers use this as a basis of comparison using a reflector that will give an evenly lit area with a standard lens.
With units that have changeable reflectors the GN on it's packaging may or may not give a GN for each variable
but you can still determine a GN for yourself.
FWIW the Vivitar 283 and 285 have the same output. The 283 is slightly smaller & lighter. The 285 has a variable power dial and Zoom head, effectively changing the coverage of the flash.
The Vivitar 283,285 are shoe mounted flashes, hand held flashguns in my book are hammer head, spud masher type flashguns .
And Vivitar had a very nice "L" bracket with a removable handle for them.
If you are going to use a Vivitar flash bracket you may as well use the real thing, the guide number of a Vivitar 285 is 39 meters 120 feet and has 4 auto apertures, the Metz 45 CL5 guide numberis 45 meters (146 feet) and it has 6 auto apertures and is much more versatile and powerful.And Vivitar had a very nice "L" bracket with a removable handle for them.
If you are going to use a Vivitar flash bracket you may as well use the real thing, the guide number of a Vivitar 285 is 39 meters 120 feet and has 4 auto apertures, the Metz 45 CL5 guide numberis 45 meters (146 feet) and it has 6 auto apertures and is much more versatile and powerful.
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