Originally posted by partynoparty Thanks for all the replies. Excellent macro advice, however I'm not entirely sure that what I want to be doing is macro, at least not for the larger insects. I think maybe I wasn't very clear when I first stated my question, or this might just be a stupid question... but I'm not looking to get close-ups or details of just parts of the insects, if that was how my question was interpreted. I want just a single shot of each insect with the entire insect in the frame. Very two dimensional. And I just want each photo to be as clear and detailed as possible. I think maybe what I want is just a very high resolution photo. Would that just translate to lots of megapixels? What else might there be to it? One other point is that this is a fairly extensive insect collection, numbering in the thousands, so I'd like to minimize post processing as much as possible.
You will probably best be served by a Macro prime lens, as those lenses are designed to be sharp and provide as much detail as possible.
For your purposes a less expensive manual focus lens will suffice as your subjects will not be running away.
This lens should allow you to do what you need with minimal post processing once you figure out your lighting setup.
For the smaller insects you will need to focus fairly close, so 1:1 macro lenses allow you to get in real close if you want the entire insect in the frame, as you say.
More megapixels will allow you to make bigger enlargements or crop the picture more, but I still think you need to start with a sharp macro lens.
When searchng for a macro lens it is best to go with a prime lens, as lots of old zoom lenses say they are macro but will not have the sharpness that a dedicated prime macro lens will have.