Because you folks were nice enough to tell me what I had to do, I modified the scope from 20 watt halogen to 3 watt LED. It is can be made to be extremely bright. That extra iintensity comes in handy for phase, dark, and oblique lighting.
I changed all the objectives to PLAN which didn't seem to make much difference until I added PLAN eyepieces. My, what a difference!
Specimen images are taken using a 100x PLAN, IRIS objective. Condenser iris is set to about 50%. One image is with olive oil ( R.I. =1.46 ) and the other image is dry. There is not much difference between them that I can see with my old worn out eyes.
Results.
1. Modification of light source - worthwhile.
2. Use of plan imaging - worthwhile
3. Use of Iris Objective - worhtwhile
A good morning opver all. Have fun, Greg
![Laughing :lol:](./images/smilies/icon_lol.gif)