Looking to start taking some macro photo's of my corals. Any recommendations for the Nikon 5100 DLSR? What filter to go with this lense for Blue LEDs? Thank you.
I second the 105, it really is an amazing lens. However, be aware of the crop factor from using an FX format lens on a DX format body. With a crop factor of 1.5x that turns the 105mm into a 157mm. Which makes it rather difficult to work with, unless you are taking single polyp shots, or have a tall tank.
Probably the 40mm 2.8G, 85mm 3.5G ED VR or Tamron SP 60mm. They all have their advantages, I personally prefer a lower aperture lens over a VR lens any day. So I would start with the 60mm. If price is a concern, the 40mm is nearly half the price NEW, and would definitely be a great beginner lens.
The real advantage of a macro lens is the ability to focus on a subject within a closer proximity then other lens. Most macro lenses are prime lenses (fixed focal range - so no zoom function) This is because prime lenses typically produce a sharper image with lower apertures. That being said, there are a few zoom-lenses on the market that have the ability be used as a macro lens, Sigma 18-250mm F3.5-6.3 DC. As you will note, the aperture on this zoom lenses is also much higher. This basically means the lens is going to take in less light when a photo is being shot, making it much harder to capture good macro shots without strong white light. To achieve close polyp shots, you will want to go for the 85mm, for colony shots you will want to go with the 40mm. That being said, you could get the 40mm, get as close as the lens will focus and crop down a little, or vice versa with the 85mm.
I believe so, it has a minimum focus distance of 9 inches, so it should do pretty decent with close up shots as well as wider colony shots. The price is almost double the 40mm, but you could probably find a used 60mm for 400.