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Latest Review Posted	SMC Pentax-M 100mm F4 Macro This is my first posting on this forum, so hope this is useful. I first purchased this 100mm Macro lens in my early 20s and always enjoyed the versatility. I think that it was one of the first telephoto lenses that I acquired at the time. Lately I've be rebuilding my original Pentax SLR system and added this lens (again) for a specific purpose. For digitising thousands of slides, similar to what Henrico has been doing in his post. The 100mm focal length is perfect - as I can work some distance from the slide or 35mm negative. Being a macro lens it has a very flat field and is simple use connected to an inexpensive bellows unit. I have two setups. The slide projector workflow is fast and yields good results, though the light source shows some vignetting. For the important slides or negatives I use a small darkroom enlarger as the light source. I'll attach an example. On a film camera such as ME Super or MX, the handling brings back those early memories that I still remember. Feels so natural. On a Sony mirrorless the punch-in magnification makes focusing a breeze. https://www.pentaxforums.com/gallery/images/126635/large/1_IMG_1624.jpg https://www.pentaxforums.com/gallery/images/126635/large/1_IMG_1628.jpg https://www.pentaxforums.com/gallery/images/126635/large/1__DSC1078-HDR.jpg