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Most camera's can't focus when the aperture number is above 5,6. Although your tele zoom starts at 4,8, it reaches the 5,6 at about 150 mm. So from there and up it can't auto focus. You still should be able to focus manually, but for wild life or sports pictures, it is useless.
Usually those lenses have retaining rings that unscrew from the barrel of the lens. My guess (not having seen the exact lens) is it's the same with your lens.
I would suggest you get a set of micro straight edge screwdrivers and a rubber cap and lid remover, like those sheets of rubber you use to get a better grip. A rubber glove may do the job if you don't have one, but make sure to wash any powder off the glove before you start work.
Start by taking off the first retainer, which is that thing with the printed letters and numbers on it. If you can't get enough friction with the rubber on it, then use the micro screwdriver. The way to use the screwdriver is to stick the tip onto any sort of dimple on the retainer, such as the lettering. It will damage the printing, but on a cheap lens it won't matter much. There may be other retainers you encounter as well that have a notch in one side that you can slip the screwdriver into and use that to turn the ring.
Best of luck as good quality camera lenses are assembled in totally dust free environments. Even if you are to get the lens fully apart, the fungus may be not on but between one of the glass elements ( some are compound lens elements made of more than one piece of glass). You cannot disassemble a compound lens glass - a hammer works tho!. Not sure about ammonia but bleach is a good fungus/bug remover - but any chemical may well affect any lens coatings.
If this is the OM fisheye as I think, I would leave any repairs to a good camera/lens tech - too valuable to stuff up.
Hey savmoney, Your current OM lenses are not directly compatible with the current four thirds mount used on Olympus DSLR's, but there is an OM four thirds adapter which should allow you to mount your older lenses to a new Olympus DSLR. You should have limited functionality while using the adapter, but according to the manufacturer aperture priority should work and full manual. I have included a link to a chart that shows which OM lenses are supported by this adapter. I hope this helps! http://www.olympusamerica.com/cpg_section/cpg_files/mf1instcomp.pdf Sincerely, Allan Go Ahead. Use Us.
The E-500 body has a "bayonet" twist & click attachment for the lens. There is no way that a simple screw threaded lens can attach to the camera directly.
The lens that you have are designed to screw into the front of the original Olympus lens.
I have seen some of these adverts on auction sites and they are worded something like "The wide angle / Tele lenses are simply mounted in the front of the Olympus EVOLT E-500 / E-330 / E-300 standard ZUIKO Digital EZ 14-45mm lens, or any other lens with 58mm filter thread."
Which maybe isn't clear enough.
So the bottom line is that you need an Olympus lens to use the other lenses you have bought.
Please update the question & let us know if the information given was useful to you - Good Luck!