What guide number for 430EX II when using with 135mm tele lens?

The guide numbers are given till 105mm but I use this flash on an analog camera with 135mm lens. Help...

It's not so much the focal length of the lens as much as it's how far away your subject is. I'm not sure what guide numbers you're talking about go until 105mm. Maybe you're talking about the zoom setting of the flash? Wikipedia has a pretty good definition and a formula you can use. http://en.wikipedia.or​g/wiki/Guide_number

Sorry, I was not so clear in asking about it.

http://photonotes.org …s.pl?flashType=​canon430ex

This flash have zoom till 105mm and GN @105mm is 43 meters.

Using the formula in the wikipedia article I have generated a distance table with aperture 1.4 -> 22 on x-axis and flash power 1->1/64 on y-axis for focal length 35mm, 50mm and approx 85mm.

I like to have similar table for 135mm too, now guide number I have to use.

Stamp wrote in post #13070344
It's not so much the focal length of the lens as much as it's how far away your subject is. I'm not sure what guide numbers you're talking about go until 105mm. Maybe you're talking about the zoom setting of the flash? Wikipedia has a pretty good definition and a formula you can use. http://en.wikipedia.or​g/wiki/Guide_number

The guide number of the flash is 43mm with the flash zoom head set to it's longest setting (coverage for a 105mm lens).

With anything longer than 105mm mounted to the camera, the flash will zoom to 105mm and the GM will be 43m. 43m is the biggest GN this flash can give you.

^^^WHS

Alan