I am looking for a lens to use for event type photography. e.g. A niece's 21st or a sister-in-law's wedding reception. Not as official/professional photographer, just trying to take nice photos for people when there is no pro (or they have gone home). I'm not talking about setting up a booth, I'm talking about roaming the party.
Context/Equipment
I have Nikon D3000 and SB-400 flash ( and 18-55mm and 55-200mm kit lenses). I have never shot a picture with an aperture less than f/3.5 of those lenses. I've never used a prime. I'm going to give the Yongnuo 565EX (did I mention budget) a go to learn a bit more about flash. I'm not sure if I'll get it off camera at an event like I mentioned above. Bounced, on a bracket or maybe hand held. In future I might look to push to a newer/better crop frame camera in order to push the ISO, but I think a lens is probably first order of business.
Current Options:
I am looking at the Nikon 35mm f/1.8 DX and also the Sigma 17-50mm f/2.8 EX DC OS HSM
Any user feedback/anecdotes on these lenses, particularly on a Nikon crop frame, would be appreciated.
Specific questions:
1. Maximum aperture: What would I really be using the f/1.8 for at this type of event? The artistic feature of that aperture, or the light capturing ability? Will I use that aperture much at all? Will I miss it in the f/2.8 zoom? Will I seriously dig the f/1.8 for natural light portraiture (obviously not part of the brief I specified, but that is an interest)
2. Stabilisation: Will the gain in light gathering of the f1/8 be lost in the possible need for a faster shutter speed due to lack of "OS" (VR or whatever else you want to call it)?
3. Zoom: Is the convenience of a zoom a big deal at an event like those mentioned?
Happy to entertain other lens suggestions. $AU500 price of the zoom is stretching the limit at this stage, so keep that in mind. I am more than happy to look for used lenses to keep the price low.