Hi guys Im quite green when it comes to digital photography. i know bits and bobs tho. just got my self Olympus E-410 with double lens kit. the problem i have is that standard lenses are not quick enough (f speed wise). Im currently looking for a good macro lens and telephoto, but the range is not impressive for 3/4 standard and those available are quite expensive for a rookie. the question i have is, is it worth it to try lens converters for different mouns (pentax k mount for example) and what are the advantages and downfalls of using converters?