You mention needing a plano-convex lens, but list in the BOM a biconvex... #2

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1. sittinduk93 commented on Feb 23, 2014

   

   sittinduk93

   on Feb 23, 2014

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   Hi,

   Yes, sorry for the disorganised state of our wiki, with 5 people working
   on the project for 10 weeks we spent most of the time building and not
   enough time organising our work.

   The simple answer is: use biconvex as there is less collimation error.
   We started using a plano-convex as they are cheaper then moved to the
   biconvex once we'd proven the concept.

   Current research microscopes have a special 'tube lens' which does the
   same job (focussing the light from infinity) but has special coatings
   etc. to prevent aberrations. A biconvex lens will do the job fairly
   well, a plano-convex will also be fine as long as it is the right way
   round (that's what the diagram is supposed to show).

   I've made a few changes to hopefully clear this up.

   Thanks,
   Chris

   On 23/02/2014 01:01, nmz787 wrote:

   Here you say to use a plano-convex, but the first image shows shows a
   biconvex, then the second shows the plano-convex (with the ray trace):
   https://github.com/OpenLabTools/OpenLabTools/wiki/Optical-Setup

   But here in the BOM you show a biconvex, which doesn't have the one
   planar side!
   https://github.com/OpenLabTools/Microscope/wiki/Microscope-Optical-Components-and-Instructions---Summer-2013

   So what's the difference, and which is the better/proper one to use?

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