My fellow Nikon aficionados, Ever since going digital my old MF Nikkor glass has been gathering dust. Now I'm starting convert some of the pre-AI lenses so they will fit on my D70 and film bodies newer than my F2. I was getting ready to send my 55 mm f/3.5 micro-nikkor P to be converted, and in the process looked up this lens on Bjorn Rorslett's page. It seems it's a fairly rare early version, with close-up performance that rates a 5 on Bjorn's scale. (Text from Bjorn's page below). My question: Should I go ahead and convert this lens, or would it be better to keep it intact to retain whatever collector's value it might have. I'd rate it's condition about 8 on a scale of 1-10. Jeff From Bjorn's page: "The modified Micro-Nikkor from the mid '60 had much flatter image field than the first version of 1961, and gave close-ups with tremendous sharpness. Despite its single-layer coating, the deeply recessed front element ensured flare problems were minimised. This lens had an outstanding feature directed at the non-TTL light meters of its era, viz. an aperture that changed f/numbers by itself as the lens was focused closer. This meant the photographer could measure exposure the usual way and let the lens take care of the adjustment needed by the close-focus extension. Really neat if you didn't use TTL (I did TTL, however, with my Nikon F Photomic of these halcyon days, and the aperture re-re-adjustment was cumbersome indeed - I ended up doing stopped-down metering with it). The 55 mm Micro was optimised for close-ups with peak performance at 1:10 magnification, and the image quality suffered when it was used for landscape shots. For close-up work, peak performance was between f/5.6 and f/8. The near symmetrical design ensured that it performed well when reversed onto a bellows or extension tubes. I have used it this way successfully for shooting macro images on 6x9 cm and 4x5" formats. "Some confusion exists as to which Micro-Nikkor is the one with adjusting aperture. Partly this is due to the term "Micro-Nikkor P" used in Nikon literature, whilst the lens itself only is engraved "Auto". At least my sample is. Since there is an immediate successor without the compensating feature, but "P" designation, identifying this model is not easy. However, a lens with chrome barrel, magnification factors printed in light blue, and hill-and-dale focusing and aperture collars likely is the real thing."