Hi Chandra My only comment is be careful of modern microscopes that have a frosted glass screen with LEDs behind it, just below the plate. For looking at crystals you need *directional *light. I've seen some very expensive modern microscopes with illumination that just doesn't work for crystallization. If I come across that situation I normally make a platform and raise the plate up by a few inches - it can dramatically improve the quality of images. You can also cut a round hole in e.g. a piece of aluminium foil and use it to make the area of the light source smaller.
On the other hand illumination mustn't be *too *directional because the drop itself acts as a lens. If you have a light source that is small and too far from the sample you'll get black regions around the outside of the drop where you can't see crystals. It's all about the solid angle of the light hitting the sample - I'm sure others can explain better than I can. Good luck, Patrick On 7 March 2018 at 02:06, Chandramohan Kattamuri < 00001c5b7cb6c764-dmarc-requ...@jiscmail.ac.uk> wrote: > Hi > > I'm looking for suggestions on a good microscope for looking at crystals, > which includes polarization, light source (fiber optics), crosshairs and > camera mount. What Models and make? > > Thanks in advance > > Chandra > > > > > -- patr...@douglas.co.uk Douglas Instruments Ltd. Douglas House, East Garston, Hungerford, Berkshire, RG17 7HD, UK Directors: Peter Baldock, Patrick Shaw Stewart http://www.douglas.co.uk Tel: 44 (0) 148-864-9090 US toll-free 1-877-225-2034 Regd. England 2177994, VAT Reg. GB 480 7371 36