Im struggling to find a darkfield condenser with lower aperture of 1.4 despite of it being quoted in multiple resources. Ie table 2:
http://olympus.magnet.fsu.edu/primer/te ... field.html
I've failed to find any recent or vintage product of cassegrain or bicentric condenser.
I want it to work with 40x/1.3 objective without aperture diaphragm.
Is anyone aware of this type of condenser model?
Searching for 1.4+ darkfield condenser
Moderators: rjlittlefield, ChrisR, Chris S., Pau
As you know for sure, the inner aperture of the DF condenser must be smaller than the objective aperture. If you have for example the typical 1.2-1.4 oil DF condenser the objective must be under 1.2, so 1.1 theoretically. I never saw any of to those Cassegrain 1.40-1.50 and Spot Ring (Bicentric) 1.40-1.50 at http://olympus.magnet.fsu.edu in catalogs, brochures, used market..etcJohnyM wrote: Like Beatsy said, i have few 1,15-1,3 and 1,25-1,4 condensers, am i missing something here?
I guess that are no in production and maybe only were experimental or of limited use devices.
There are objectives with NA over 1.5 although not often listed in standard brochures, only used in some advanced flourescence techniques.
Thanks for questioning my too simplified answer, it has obligated me to return to the topic after some years. the physical limit is higher than I supposed.
Pau
ThanksPau wrote:I never saw any of to those Cassegrain 1.40-1.50 and Spot Ring (Bicentric) 1.40-1.50 at http://olympus.magnet.fsu.edu in catalogs, brochures, used market..etc
THAT is my problem. Only place where i see it is mentions in literature (multiple times and languages) but never seen one even on photo. I guess i can alway reverse Nikon Apo TIRF 1,49 or similar
Maybe it's this...
http://www.leitzmuseum.org/Misc-Leitz/O ... 7B%27.html