I needed a loupe that had a 4 inch extension for my camera. I didn't want to spend $ 45.00 US (plus tax and shipping) so neccessity is the mother of invention. I discovered that I could use a Nikon 35 MM loupe with minimal renovation. I added for 0.78 cents a 4 inch PVC pipe connector to the eyepiece of the loupe and VOILA it works perfectly. If anyone is interested I will send them a close-up photo of my wonderful invention. I also discovered that if I use Static-Free spray on my negative holders and then wipe them clean and use compressed air , my negatives are 99.9% dust free.