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Balsam Post Issue 91 (April 2011) pages 12 -21 "Arthur Strange's Variable Amplitude
Contrast Method - VAC 2".

by Brian Wilkinson


Nitzschia X40 Zeiss Neofluor 0.75, bright field at X 2,400 showing no detail just empty magnification ( X10 ocular, X2 optivar and X3 on camera).



Nitzschia, same optics, but enhanced image at X 2,400 using VAC 2, rotating the stage to position giving maximum resolution and contrast using Zeiss WL stand, VAC 2 stops added to spaces in Apl. 1.4 phase condenser.




Next 9 photographs:" Pedicellaria of sea urchins", a Flatters and Garnet slide. All on Reichert Zetopan, X 10/0.25 and X 16/0.32 0bjectives, VAC 2 stops added to spaces in phase condenser.



Bright field X100



VAC X 100



VAC X 160



Bright field X 160



VAC with colours generated from rotation of compensators, X 160 - and the next three photographs.






VAC giving Dark Field from crossed polars.




Next 5 photographs:Crystals of Potassium Dihydrogen Phosphate, on same Reichert Zetopan, using X25/0.45 obj.and same modified phase condenser.



VAC X250



Brightfield X250



VAC X250, adjusted to highlight crystal edges and compensator added for colour.



Brightfield only for comparison, X250.



VAC plus colour, X250.



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