All taken with a Nikon D3000 and Nikon 18-200mm f4.5-5.6 lens. Still trying to improve on Exposure and composition.
I like these and think it's getting better. I'm sure there is chromatic abberation on some of them. I don't think I can fix that, but will have to live with it. If there are halos, I don't see them, but don't mind if you want to point them out.
When it comes to exposure on flowers, I try to spot meter and then add or subtract based on blown highlighs as indicated by blinkies. I've also used a reflector when possible to even out the light on the flowers. Matt board was used for backgrounds on all but the tulip.
1/100s: f8: ISO 200; 135mm: Spot +1/3
1/500s: f5.6: ISO 200: 200mm: Spot
1/40s: f5.6: ISO 200: 200mm: Spot +1
1/8s: f36: ISO 200: 90mm: Spot -1/3
1/125s: f10: ISO 200: 200mm: Spot