Hi everyone
Have been off the forums for quite a while now (basically a new job which has taken up all my time plus a fair bit of travelling over the past 6 months or so), but have missed the photography forum especially so now making an effort to get back into it as things have settled down a bit.
So I thought I'd start back with a question. It's my son's first communion on Sunday (plus 4 other kids), and knowing that I'm into photography the other mums and dads have asked me to do the group/individual photos. This is fine and I'm happy to do it, but I don't do much/any indoor photography (I'm more into wildlife/landscapes/architecture - I take plenty of shots of people but usually outside) plus I only have the onboard flash at the moment. I should be able to use a tripod, and the light is usually reasonable inside the church but not fantastic. My lenses are in my sig, but my current thoughts are:
- The Sigma 100-300 is obviously no use, and whilst I love my 18-200 VR as an everyday lens I'm presuming I'll get best results from the 50mm/1.8 and the 90mm/2.8 (although will this still struggle inside without decent flash?)
- Use my tripod
- Shoot in aperture priority (although I'll need to be careful for DOF on the group shots if I'm shooting at 1.8 with the 50mm)
So any thoughts/tips from anyone (Guy, if you're out there I know you'll have good advice, but the more the merrier folks

). Am I thinking along the right lines, or do I really need to go and invest in an external flash?
Aargh - first post back and I'm already looking to spend more money, I knew there was another reason I'd kept away from this place

Still, I haven't bought any new kit for a while...
And if I should take the opportunity to buy an external flash (which would probably be the Nikon Speedlight SB800), what would be the idiot's guide to using it in this circumstance, bearing in mind I'll probably only have an hour or two to play with it before Sunday?
Any comments/advice gratefully received folks.