Quote Originally Posted by Whiteymorange

M2 is, I think, an instantaneous flash with a long period of sustained light, primarily for focal plane shutter use.
So in my case, this could be a good fallback, provided that the Hawekeye has a rotary shutter just behind the lens?

Quote Originally Posted by Whiteymorange
5 is the most common bulb out there with the bayonet mount, good for middle distances and for most situations. There is a blue version of it for daylight film- can't remember that number... 11?
25 is a bigger, brighter bulb, for maximum coverage in terms of distance and wide angle work. Sort of thing you'd use in an auditoreum.
J&C has blue bulbs identified as 5B and Press 25B; clear bulbs identified as #5 and Press 25. So I could buy either #5 or 5B and be fine for close distance situations. Do you know if "Press" is the only type of 25?

Quote Originally Posted by Whiteymorange

Not gospel, just the product of an often faulty memory. I'll try to get an early 60's guide to you by tomorrow.

Awesome! Muchibus thankibus!