#38
Post
by apochronaut » Wed Jul 15, 2020 10:23 am
Those quite often show up lacking the illuminator socket. They are very similar to the 214F, just housing a heat absorptive window that it does not have, so you can use it up to the 63X objective without the illuminator, which is how a lot likely have been used, hence the misplaced socket You will need it for the 100X. You will also need a #1079 100X objective to put the funnel stop in that came with the condenser. The threads will be different on the two funnel stops. One is for the 1079 and the other is for the 97X(some rare 100s exist too) for the later 160mm scopes: 2/4 and 15/35.
The alternative is to keep an eye out for an iris equipped # 1014 objective. If you get into high magnification DF to the point that you are using the 100X a lot, you may find that you need to back and forth between it and a lower magnification some. Removing the oil to do so is a ridiculous practice, so the wise and committed manufacturers of microscopes , like AO , made available oil immersion lower magnification objectives, partially for that purpose but also for fluorescence applications. There are two 50X oil immersion: the 1016 50X .80 planachro and the 1026 50X achromat. Both have irises.
Personally, I would recommend the #1026. They are less common, though. Here is the reason. I did a comparison test of all of the 34mm parfocal 40-50X infinity corrected AO objectives some time back. While I was doing it I decided to try out the two oil immersion versions with water immersion as well as dry. While neither suited the 1016, the 1026 produced a very acceptable image with both water and dry. When used dry, the 1026 was about as good as an average .65 achromat, so you could fit it in the nosepiece and use it either dry or with oil as your choice. It's oil immersed image is quite highly resolved, just a hair below that of the 1016. I think the 1026 has better colour correction, probably due to the 1016 needing fluorescence capability. Pretty early in that regard.....and of course the 1016 is plan, not a necessary requirement for many viewing situations.
I will look for the socket. Back of my mind says: I have one and you can buy off the shelf led bulbs that fit and work. They are for a 6v. tail light application. Cheap on ebay.