Unbranded NEW 4X Planachromate objective on Olympus BH2 microscope
Posted: Thu Jul 25, 2019 3:45 pm
Hello all,
Some time ago I compared the performance of an unbranded ("generic") inexpensive 4X0.1 Plan achromat objective with other 4X objectives. on a Zeiss Standard stand, under afocal and focal setups. For anyone who might be interested,
it was here:
viewtopic.php?f=5&t=7734&p=68109&hilit=unbranded#p68109
Fortuitiously, I have had the chance of testing the same objective on a trinocular BH2 stand. Illumination - halogen (plus blue filter), condenser - phase contrast at BF position, Kohler adjusted. The eyepiece USB camera, along with its 0.5X lens, was inserted in the photo tube (no additional optics there), and was manually adjusted to be nearly parfocal with the bino eyepieces. I compared the unbranded 4X to an Olympus DPlan 4X0.1 objective (both require a coverslip, but I placed the exposed stage micrometer without cover). Please see images below.
On this setup, and at least, without expanded views of the images, I feel that the unbranded objective about equals the Olympus objective. Both are limited by some CA from the camera itself, probably, but the results are decent. I think that these results are In agreement with PeteM's conclusions from evaluation, within the post in the link.
Side note: a personal super subjective opinion, the halogen + blue filter yields a more plain bright white background than the LED replacement (this is not meant to be a can of fuel added to the fire). Or is it the 25 years-younger BH2 vs Zeiss Standard...
Some time ago I compared the performance of an unbranded ("generic") inexpensive 4X0.1 Plan achromat objective with other 4X objectives. on a Zeiss Standard stand, under afocal and focal setups. For anyone who might be interested,
it was here:
viewtopic.php?f=5&t=7734&p=68109&hilit=unbranded#p68109
Fortuitiously, I have had the chance of testing the same objective on a trinocular BH2 stand. Illumination - halogen (plus blue filter), condenser - phase contrast at BF position, Kohler adjusted. The eyepiece USB camera, along with its 0.5X lens, was inserted in the photo tube (no additional optics there), and was manually adjusted to be nearly parfocal with the bino eyepieces. I compared the unbranded 4X to an Olympus DPlan 4X0.1 objective (both require a coverslip, but I placed the exposed stage micrometer without cover). Please see images below.
On this setup, and at least, without expanded views of the images, I feel that the unbranded objective about equals the Olympus objective. Both are limited by some CA from the camera itself, probably, but the results are decent. I think that these results are In agreement with PeteM's conclusions from evaluation, within the post in the link.
Side note: a personal super subjective opinion, the halogen + blue filter yields a more plain bright white background than the LED replacement (this is not meant to be a can of fuel added to the fire). Or is it the 25 years-younger BH2 vs Zeiss Standard...