I recently purchased a Raynox M150 Macroscopic lens which is essentially a closeup "filter" lens similar to what you're considering. The main difference is that it comes with an adapter which makes it usuable with lenses having different sized objectives, unlike the screw-on type. I've only experimented with it sparingly at this point, attaching it to the front of a Sigma 70-300 APO DG "Macro" lens which by itself does a decent job of capturing butterflies, etc, from a distance of about 3 feet away. I'm impressed, however, by the pictures posted here and elsewhere which are detailed enough to allow you to count all the hairs on a gnat's derriere, and decided I needed more magnification than the Sigma provided. I wasn't prepared just now to spring for a dedicated macro lens, and having read postings by Pentaxians who seemed satisfied with the Raynox, decided to give it a try. My experience thus far has left me less than enthused. First of all, with the Raynox on my Sigma in macro mode, I now have to get within about 10 inches of the subject, and of course the camera has to be mounted on a tripod. Focusing is difficult, and must be done manually, because the Sigma when fully extended is at f 5.6, and adding the Raynox bumps it up to f 8 or so I would guess. Moreover, because of the limited effect of the Sigma's focus ring with the Raynox attached, it's necessary to focus by moving the tripod back and forth until the subject is reasonably well in focus and only then using the focus ring to sharpen the image. Oh, and did I mention that the DOF even at F22 is very shallow. Things are a little easier with the Sigma at 300mm and not in macro mode, but not by much. Interestingly, I've found that I'm much happier using a Kenko 1.5X teleconverter on the rear of the Sigma than the Raynox on the front of it. There's not quite as much magnification, but I don't have to get nearly as close, and it's easier to focus and shoot hand-held. I'm still impressed by many of the macro images I've seen, and may yet break over and purchase a dedicated Macro lens. There is, after all, no rational explanation for LBA. One thing I can't help but wonder about, though, is what do you do with all those pictures of bug's eyes, etc., assuming that you haven't been hired to illustrate a textbook on entomology. Surely you're not going to print them out and hang them on your living room wall???
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