Originally posted by jubei951 Now..onto the flash.
Is there any particular flash unit I should be looking out for with the *ist DL? I've noticed that the built in flash puts out some harsh light, and also seen some DIY diffusers / bounce.
I would think my general use of flash would be for indoor photos and photos of people if that should affect my decision on which type of flash to get?
The main thing you want to do so that flash doesn't look harsh is to avoid direct flash. Basically, direct flash, near the lens is just about the worst way to use flash. Accessory hotshoe flashes give you more power, mounted further from the lens, and give you the capability to bounce the flash for more diffuse (soft) light. You can mount diffusers but by bouncing (say off a ceiling) the light is diffused off a large reflective area rather than in a small point source. Another factor is balancing with ambient light. Basically make the most of the available light and flash power by raising ISO and not stopping down the aperture too far and keeping the shutter speed on the lower side will allow at least some ambient light (natural and/or artificial) to blend with the flash light.
*ist DL is designed for use with P-TTL flashes like the AF-360FGZ and AF-540FGZ. The primary difference between the two is that the 540 is more powerful and features a head that can both bounce (tilt vertically) and swivel (rotate horizontally). The swivel head can be useful for bouncing in other directions such as against walls to the side or behind you...and also allows you to bounce vertically off the ceiling while the camera is oriented vertically. I have found that either one of these flashes, simply pointed vertically and bouncing off a typical white-painted residential ceiling does a lot to make pictures much less 'flashy'. I like the swivel on the 540 a lot so this was my first flash. I later picked up a used AF-360FGZ for ~$150 to use as a second flash for travelling lighter or when using multiple flashes, triggered wirelessly. There are some third party flashes that may be a bit cheaper--for example, there's a Sigma flash with a swivel head that is generally priced lower than the AF-540FGZ. Metz also makes some P-TTL flashes though I don't think they are particularly bargain-priced. There may be some inexpensive alternatives that are P-TTL enabled but these lower-priced models usually sacrifice some typical P-TTL features like high-speed sync (enables shooting at reduced power at shutter speeds higher than 1/180), wireless (multiple flashes) and possibly some other modes like trailing curtain sync and auto flash.
Auto Flash - when I say 'Auto Flash' here I'm referring to an old form of flash automation where instead of using the camera's built-in light meter through the lens to determine flash exposure, it instead uses a small thyristor sensor on the front of the flash body. These flashes have been around for a long time and can still work quite well--and the flashes can be bought at much lower cost. A pretty good choice here is the old Pentax AF-280T which can be bought in great shape for < $50, it offers a swivel/bounce head in a relatively compact design, and offers both manual and auto modes (The TTL mode won't work properly on your *ist DL, it was designed for older film cameras). Basically you manually set the ISO on the flash, and the flash can modulate its power for 'correct' exposure within the constraints of aperture and subject distance.
Anyway this is a fairly big subject area so I'd prefer to hear what you're thinking before going into more detail.