Thank you so much, Rich, for this practicle/hands on microscopy thread. Rolf, Randall, David have clarified performance for visual, vrs. image...
65201
Oliver Kim
cyber.oliver
Nov 2, 2011 11:32 am
Hello! It is unbelievable on how fast time passes. About one year ago I started to work on the first issue of Microbehunter Magazine, and so far 10 issues have...
65202
f80nikon
Nov 2, 2011 1:40 pm
Dear Henry, welcome on board! I got a MM6 at work, and I'm trying to update it. Here we have some really expert on the field so you are on the right place to...
65203
GaryR
xccrosscountry
Nov 2, 2011 4:42 pm
My apologies for a non-microscope question; but I have found no place else to ask! I have just acquired a dated Perkin Elmer 467 IR grating spectrophotometer....
65204
J. Forster
j_forster911
Nov 2, 2011 5:01 pm
Don't try to clean the mirrors, and esecially the grating. They are likely all first surface and very delicate. -John...
65205
Randall Buck
rbuck777
Nov 2, 2011 5:53 pm
Hi Gary, Re., window or windowless? It all depends upon the range of wavelengths you are interested in. As you go to longer wavelengths, the ambient...
65206
J. Forster
j_forster911
Nov 2, 2011 6:03 pm
Randall, Using any wet flow method of cleaning the mirrors means they have to be removed from the instrument. How many ways can I say that is a VERY bad idea?...
65207
Randall Buck
rbuck777
Nov 2, 2011 6:43 pm
Hi, The more I think about the subject, the more I come to believe that John W. (ajohn) has condensed the whole subject into a very succinct statement: ...
65208
Randall Buck
rbuck777
Nov 2, 2011 6:56 pm
Hi John, Right, it certainly does increase the steepness of the learning curve which is another reason why I suggested NOT cleaning, initially. Nevertheless,...
65209
Peter Werner
germpore
Nov 2, 2011 7:01 pm
I'm making a set of Rheinberg filters and darkfield stops for a pondwater microscopy event I'm holding next week. I'll be printing the Rheinberg filters from...
65210
J. Forster
j_forster911
Nov 2, 2011 9:57 pm
... Unless it has been seriously played with, it's probably pretty close to alignment. And, it is far, far easier to "fine tune" an instrument than do an...
65211
Selwyn St Leger
selwynstleger
Nov 3, 2011 6:22 pm
HiRandall, Those are interesting observations and well put. One point you raise merits further discussion. That is whether or not the condenser diaphragm...
65212
John
a.johnw
Nov 3, 2011 10:47 pm
... Not exactly correct it doesn't have to be an apochromat to achieve 1.4na. It's a curious area no one makes apochromats any more only plan apochromats and...
65214
Charles
sberk5
Nov 4, 2011 2:57 am
Peter, I don't know of any formula to help you. You did say "...several centimeters below the actual condenser iris..." which may be too far to really work...
65215
Jay Stanley
js88keyz
Nov 4, 2011 3:30 am
Peter, This might help too http://www.rheinberg-filters.info/ Peace, Jay [Non-text portions of this message have been removed]...
65216
John
a.johnw
Nov 4, 2011 11:49 am
Our eyes work the other way round - resolution goes down as contrast goes down but for some reason there is a odd kink at the bottom end that increases...
65218
rene
rvanwezel
Nov 4, 2011 2:46 pm
No way. Where did you get the idea that Zeiss made single-element eyepieces?? And what exactly is the Periplan design? Just curious. Best wishes, René...
65220
John
a.johnw
Nov 4, 2011 4:51 pm
Just looking at my KPL's the eye lens is a singlet, the field lens looks to be a singlet too and there is yet another lens above that. Could be the field end...
65221
Fred Hess
fredhess2002
Nov 4, 2011 5:05 pm
Hello Rene and Rich, Zeiss KPL and Leitz Periplan-eyepices are more or less the same. Both are plan-oculairs of the socalled type: compensation-plan-oculairs...
65222
John
a.johnw
Nov 4, 2011 5:11 pm
Looking at a normal periplan it doesn't seem to be a lot different to the kpl except the the mid lens is much further away from the field lens. The goggles...
65223
John
a.johnw
Nov 4, 2011 5:19 pm
Hi Fred is this one a high eye relief version http://groups.yahoo.com/group/Microscope/photos/album/1591448260/pic/886323880/view If so they are as I thought a...
65225
Randall Buck
rbuck777
Nov 4, 2011 5:50 pm
Rich, ?? When you post information that is obviously hearsay, a better approach may be to quote the source or at least place a question mark after that ...
65226
Randall Buck
rbuck777
Nov 4, 2011 6:12 pm
Hi Rich, Thanks for using the question marks. But it still sounds like you are stating a (nonexistent) fact. What I mean is, "KPL" is nowhere mentioned in the...
65227
Randall Buck
rbuck777
Nov 4, 2011 6:12 pm
Hi Fred, Thanks for the interesting and useful facts, they are a welcome and pleasant relief. I believe that "KPL" is a contraction of the German, "Komplan"...
65228
Randall Buck
rbuck777
Nov 4, 2011 6:13 pm
Hi John, Well I can say with certainty that the eyelens on one of my KPLs is at least a cemented doublet since the blasted thing is starting to delaminate at...
65229
Randall Buck
rbuck777
Nov 4, 2011 6:18 pm
Hi John, I have some Periplans that seem to be quite old but they do not look like the one in your link; mine have a bottom element that is about as close to ...
65230
Randall Buck
rbuck777
Nov 4, 2011 6:43 pm
Hi Selwyn, Thanks for your comments. Am I correct in paraphrasing, achieving optimum resolution is not the same as being able to use it in a meaningful way? ...
65232
pjifl@...
pjifl
Nov 4, 2011 7:10 pm
It is often possible to detect if a lens group is a singlet, doublet or triplet by looking at small intense reflections from the surfaces - external and...
65233
John
a.johnw
Nov 4, 2011 8:07 pm
Hi Randall. The link is I think to a goggles periplan type eyepiece. I have one each of these, 170mms tube length and 160mms. Both use a cluster of lenses...
65234
John
a.johnw
Nov 4, 2011 8:11 pm
Thanks Randal - I wont delve further to see exactly what it is. Are you sure you haven't got a goggles kpl? They are famed for delam. Suspect you have...
