Hasselblad Flash d-40

Are you using it with the TTL 503cw or similar camera. If so, just use it bare bulb and tilt it slightly, set the film speed dial to the ratio of exsisting light to flash that you want. Also you can probably find a used Norman soft head for the 200b or whatever it was called which looks similar to the regular relflector but has a white glass insert. The mount flange will be slightly large for the 503, but I have both and think if I were to cut a small slit in it with a saw blade and condense it a fraction it would fit fine. These work fantastic but do require careful handling, I have seen these smashed on contact with the sidewalk, but they are worth seeking out, superb light. There are also some lumequest reflectors floating around, the bigger wider ones that you could use on the bare bulb to make a softer light, some had a foil cover of silver or gold, don't know if they still make them, Denis Reggie used to endorse them for his promotion stuff$$$$. OK Enjoy!

You can control the output of the D40 by moving the dial for film speed to a higher figure. For instance if you just need a fill in flash and are using 100 ASA film move the control to 200 or 400 ASA. The flash unit will be fooled as it thinks a more sensitive film is used and will reduce the output accordingly.

Here is one.

http://www.lumiquest.com/lq952.htm

It doesn't make the size of the light a lot bigger than the diameter of the regular reflector, however. You can also get the Norman one made for flashes that have that type of bulb.

http://www.bhphotovideo.com/c/product/350727-REG/Norman_812696_Softbox_12_x.html

or

(link)

The latter two obviously will need the flash to be on a bracket. The Lumiquest one can probably be used with the flash on the camera, such as in a cold shoe on the prism.