Hi All,
If anyone is looking for a very compact external flash for the Q, you might consider the Sunpak PF20XD. Unfortunately no bounce capability, but it's only 2.3 x 3.1 x 1.1" (58 x 78 x 29mm), weighs 3.5 oz (100g), and takes 2 AAA batteries, so these add very little weight. It has a GN of 20m (ISO 100) with a 24mm (35 EQ) coverage, and there is a built in diffusion panel that slides up to cover the flash's lens. To get an idea of how small this flash is, it's a tiny bit thicker, about the same height, and about 4/5 of the width of the Q body. At $37.50, it's very affordable, and surprisingly versatile.
Sunpak PF20XD Auto/Manual Digital Slave Flash PF20XD B&H Photo
It can be used as a hotshoe mounted flash in manual mode with full power, 1/4, 1/8,1/16, and 1/32 settings, Auto Thyristor mode with f2.8, f4, and f5.6 aperture settings, and can also be set up to be used as a remote optical slave, triggered by the popup flash on the camera (it can ignore the P-TTL preflash and fire on the exposure flash). When used as a slave, it can also self meter in the Auto mode. Recovery after a full discharge is about 5 seconds with fully charged hybrid NiMH batteries.
When using the flash as an off-camera slave, if you want to block the popup flash from contributing to the exposure, you can make an IR pass filter to cover the popup by using some of the exposed and processed leader (the black part) from 35mm color negative film. This will block the visible spectrum but allow enough IR light to get to the slave to trigger it (within a reasonable distance, and with the slave positioned in line-of-sight, of course).
As devorama noted, since this is not a dedicated flash, the Q does not automatically sense it, so the popup flash has to be turned off in the flash menu for the Sunpak to fire, and the flash will not fire if the shutter speed is faster than 1/250 with a Quality Line lens.
I had bought two of these to use as digital slaves for macro work a few years ago, and it didn't occur to me for quite a while to use them with the Q
, but they work just fine. With 2 as remote slaves, I actually can set up micro (pocketable) studio type lighting for portraits, or set up the slaves in two corners of a small room, bounce them off the ceiling, and light up a small room for parties and such, and with the popup flash blocked as described above, I won't be blinding people with a flash directly in their faces. I've used both of mine pretty extensively since I bought them, and have found them reliable and sturdy.
I've just played with mine briefly with the Q, but the 1/32 setting seems to be low enough for macro distances, and with the flash on the Auto3 setting, the diffuser deployed, and shoe mounted, using ISO 125, f5 (instead of f5.6) and 1/250 (with a Quality Line lens) with the Q in manual mode exposes pretty well for most normal indoor distances.
Scott