Have you thought about the MP-E 65mm 1-5x Macro ?
I have, but I'm worried about the working distance...
65mm is really really really close, so...
Do you own the lens? If so, what would you say about it?
Hate to make your choices more difficult, but a macro lens isn't usually needed for butterfly pics, and not for most flowers, either. Usually, a 0.25x or so magnification is sufficient for butterflies - what you really need is working distance, and the 9.5" with the 180L often isn't enough. At 4-5 feet distance, you'll get higher mag with the 300/4L IS (0.24x maximum magnification, great for flowers and butterflies).
I prefer having a hard choice to being sorry about not informing myself enough before doing the choice part!
Maybe the 300mm would be worth an idea too, thanks for that feedback. I just know that my 70-200 doesn't quite do the job on flowers (at least on smaller ones)... Neither on butterflies. I wonder if the extra 100mm would give me that much of a difference there. Since it adds 0.5m to minimum focussing distance, it would end up with the same as the 70-200 at 200 (1m), wouldn't it?
Maybe I do a mistake here or haven't thought about something - today doesn't seem like my day in thinking a lot...
Anyone ever tried a 180L with a 1.4 Extender?
Would be quite an expensive solution, but I could use the extender for my 70-200 also, so maybe that would be an option?
Thanks so much for your time!