Search found 51 matches

by JGardner
Thu Jul 05, 2018 6:54 pm
Forum: Pictures and Videos
Topic: Daphnia
Replies: 8
Views: 1343

Re: Daphnia

93 images? How did you get it to sit still to take 93 images?
by JGardner
Thu Jun 21, 2018 7:14 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

It could well be the case - is there a possibility that the casing that holds the wheel/control is a touch too-tightly assembled? I don't mean the leaves, just any casing that's holding the mechanism.... I don't think so. When I reassembled the unit I had to back off the screws about a half-turn to...
by JGardner
Thu Jun 21, 2018 6:31 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

As far as I'm aware the iris should indeed be completely dry and lubricant-free. I went even further when I cleaned the field iris and completely removed all the blades and cleaned them and the other parts in solvent. Now everything is completely degreased, clean, and dry, and the iris opens and cl...
by JGardner
Thu Jun 21, 2018 6:04 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

75RR wrote:
Then again this is not going near any lenses is it?
Perhaps someone can chip in on this.
The field iris assembly is immediately adjacent to the swing-out lens. When the swing-out lens is swung in, it's no more than 3-4mm from the iris assembly.
by JGardner
Thu Jun 21, 2018 3:25 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

This should do: http://www.molykoteproduct.com/pdf/en/Molykote_33_L_Grease.pdf https://www.amazon.com/Corning-Molykote-Silicone-Temperature-Consistency/dp/B01HE9MOWQ/ref=sr_1_6?s=automotive&ie=UTF8&qid=1529561916&sr=1-6&keywords=molykote+33 I thought anything containing silicone was a big no-no any...
by JGardner
Wed Jun 20, 2018 9:14 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

I got the scope back together and the field iris works, but it's a little hard to adjust via the thumb wheel. I suspect this is because it's now totally dry--I stripped all of the lubrication out of the unit when I cleaned and reassembled it. I know that the iris blades themselves should not be lubr...
by JGardner
Sun Jun 17, 2018 6:03 am
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

Thanks for the advice. We got it back together and it works. My wife, who’s a master at jigsaw puzzles, and who has a lot more patience than me, finessed it back together. I also found that the 45-degree mirror in the sub stage assembly came completely loose from its mount. Fixing that should be a s...
by JGardner
Sun Jun 17, 2018 3:11 am
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

I got the field iris unit out of the stand and tried soaking the whole thing in solvent. Even after six rounds of solvent, it was still frozen. I took it apart and found that most of the blades were stuck to each other, leaving me no other choice but to remove them and soak them in solvent. They are...
by JGardner
Fri Jun 15, 2018 10:04 pm
Forum: Pictures and Videos
Topic: Super Glue
Replies: 9
Views: 1650

Re: Super Glue

I would not recommend getting un-cured superglue anywhere near optics, especially objectives, as it gives off fumes as it cures and these can fog lens coatings.
by JGardner
Thu Jun 14, 2018 7:28 pm
Forum: Microscopes and optics
Topic: Zeiss Universal Focus Block
Replies: 1
Views: 1032

Zeiss Universal Focus Block

Anyone know of an on-line resource that describes disassembling and re-lubricating the focus block on a Zeiss Universal, particularly the later version with the plastic focusing knobs? Is this task even doable by an amateur or do you have to be a Swiss watchmaker to take one of these things apart an...
by JGardner
Wed Jun 13, 2018 2:04 am
Forum: Beginner's corner
Topic: Help on cleaning prepared slides
Replies: 5
Views: 1422

Re: Help on cleaning prepared slides

I bought two sets of prepared slides recently and they had lots of dust and fingerprints all over them. I cleaned then with isopropyl alcohol (IPA) 91% and didn't have any issues with the cover slips coming off. Did you rub it with tissue or just pressed the tissue over it to remove the dust? Gentl...
by JGardner
Tue Jun 12, 2018 10:18 pm
Forum: Microscopes and optics
Topic: Cleaning Aluminum
Replies: 3
Views: 802

Re: Cleaning Aluminum

apochronaut wrote:Do you mean aluminum as in focusing knobs, etc.?
Yes, the focusing knobs and also the slide holder and the graduated scales of the mechanical stage.
by JGardner
Tue Jun 12, 2018 10:14 pm
Forum: Microscopes and optics
Topic: Seeking advice on glueing the 45 deg mirror under the field aperture back in place (Zeiss) - Solved.
Replies: 55
Views: 5639

Re: Seeking advice on glueing the 45 deg mirror under the field aperture back in place (Zeiss) - Solved.

I'm kind of late to the party here, but just wanted to point out that when working on instruments like microscopes, hollow-ground screwdrivers work better than the more typical taper-ground versions. The photo below illustrates the difference: https://static1.squarespace.com/static/51f9c543e4b0339e6...
by JGardner
Tue Jun 12, 2018 9:59 pm
Forum: Microscopes and optics
Topic: Cleaning Aluminum
Replies: 3
Views: 802

Cleaning Aluminum

I'm in the process of restoring two vintage microscopes to their original cosmetic condition. What's the best way to clean aluminum surfaces that have turned dull and and have small grey spots? I assume I don't want to use any kind of abrasive cleaner on these surfaces (slide holder and graduated sc...
by JGardner
Tue Jun 12, 2018 9:30 pm
Forum: Microscopes and optics
Topic: Field of View - Zeiss Universal vs. Leitz Orthoplan
Replies: 10
Views: 8003

Re: Field of View - Zeiss Universal vs. Leitz Orthoplan

What is the reason why you want to use those rubbery tops? One reason I like rubber tops is because I wear glasses and the rubber prevents scratches on the lenses. The worst are the eyepieces on my Leitz microscope. Its eyepieces have no rubber and hard metal edges that can really scratch my glasses.
by JGardner
Tue Jun 12, 2018 7:15 pm
Forum: Microscopes and optics
Topic: Zeiss Binocular Head Compatibility
Replies: 6
Views: 1145

Re: Zeiss Binocular Head Compatibility

Thanks! Looks like it’ll fit and the viewing angle will be okay. I’m seriously thinking of getting this head to replace the one on my Universal. When I had the eyepiece tubes off to fix the issue with the loose lever appearing in the field of view, I noticed that the optics on the right side are eit...
by JGardner
Tue Jun 12, 2018 6:00 pm
Forum: Microscopes and optics
Topic: Zeiss Binocular Head Compatibility
Replies: 6
Views: 1145

Re: Zeiss Binocular Head Compatibility

This one:

https://www.ebay.com/itm/Zeiss-Universa ... 1438.l2649

The listing title includes "Universal", but I'm not altogether trusting of eBay sellers.
by JGardner
Tue Jun 12, 2018 5:27 pm
Forum: Microscopes and optics
Topic: Zeiss Binocular Head Compatibility
Replies: 6
Views: 1145

Zeiss Binocular Head Compatibility

Anyone know if a Zeiss binocular head, Zeiss part number 4028014, is compatible with the Universal? A Google search turns up nothing.
by JGardner
Tue Jun 12, 2018 4:14 pm
Forum: Beginner's corner
Topic: Help on cleaning prepared slides
Replies: 5
Views: 1422

Re: Help on cleaning prepared slides

I bought two sets of prepared slides recently and they had lots of dust and fingerprints all over them. I cleaned then with isopropyl alcohol (IPA) 91% and didn't have any issues with the cover slips coming off.
by JGardner
Mon Jun 11, 2018 9:47 pm
Forum: Beginner's corner
Topic: Weekend with New 'Scopes
Replies: 8
Views: 1999

Re: Weekend with New 'Scopes

It's interesting what you can find by searching the Internet. In this case, I traced the provenance of my Orthoplan back to a previous owner. It seems that this scope was owned by the University of Texas, Houston, Medical Center, and was sold at auction two years ago for $180. With a little cleanup ...
by JGardner
Mon Jun 11, 2018 9:24 pm
Forum: Beginner's corner
Topic: Weekend with New 'Scopes
Replies: 8
Views: 1999

Re: Weekend with New 'Scopes

I'm loving this comparison. Things which may make a difference: 1. There is a lighting difference...one LED and the other 30W tungsten. I wonder if you put the LED one in the back of the Zeiss if you see an improved difference than the tungsten light. I plan to get Retrodiode's retrofit kit for the...
by JGardner
Mon Jun 11, 2018 6:09 pm
Forum: Beginner's corner
Topic: Weekend with New 'Scopes
Replies: 8
Views: 1999

Weekend with New 'Scopes

I just spent some quality time over the weekend with my two new microscopes and thought I'd share my experiences with others on the beginner's corner... After deciding to get back into microscopy after a 35 year absence, I bought a well-used Leitz Orthoplan and Zeiss Universal on eBay. Both arrived ...
by JGardner
Mon Jun 11, 2018 4:41 pm
Forum: Microscopes and optics
Topic: Zeiss Universal Questions
Replies: 14
Views: 1891

Re: Zeiss Universal Questions

Wow! Both of you guys are great! Thanks for the detailed explanations and the photos!

I'll dismantle the stage tomorrow night and see what evil lurks within.

Thanks again Charles and 75RR!
by JGardner
Mon Jun 11, 2018 2:43 am
Forum: Microscopes and optics
Topic: Zeiss Universal Questions
Replies: 14
Views: 1891

Re: Zeiss Universal Questions

Many thanks to Charles and 75RR for all the help! The head is probably a Siedentopf head, which is better than most heads. The item seen is a linkage which keeps the tube length the same when you change the interpupillary distance. You should be able to access it by removing the three screws that ho...
by JGardner
Sun Jun 10, 2018 5:41 pm
Forum: Microscopes and optics
Topic: Zeiss Universal Questions
Replies: 14
Views: 1891

Re: Zeiss Universal Questions

That microscope seems to have had a rough journey, was it badly packed? No, it was packed very well and the box showed no signs of any rough handling. I don't think any of the issues this microscope has are due to shipping damage. Not sure why the link to ebay is not working properly - here is a ne...
by JGardner
Sat Jun 09, 2018 9:57 pm
Forum: Microscopes and optics
Topic: Zeiss Universal Questions
Replies: 14
Views: 1891

Zeiss Universal Questions

The Zeiss universal I bought on eBay arrived and I have a few questions. When I remove the right eyepiece I see an "arm" (for lack of a better word) sticking out. This arm is visible in the field of view of the microscope. What is it and how do I make it go away so I don't see it when looking throug...
by JGardner
Wed Jun 06, 2018 10:06 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

Condenser Centering Screws - your surmise is correct that there are springs that are used to exert enough pressure that once the screws are released the unit will move in the opposite direction. This problem is, again, the lubricant drying and causing more resistance than the spring energy can over...
by JGardner
Mon Jun 04, 2018 10:10 pm
Forum: Introduce yourself
Topic: Hello from California
Replies: 5
Views: 2623

Re: Hello from California

Crater Eddie wrote:Welcome! Glad you bought that Zeiss, I was starting to drool over it myself.
Just got the FedEx tracking info for this scope. Shipping weight is 87 pounds! Wow!
by JGardner
Mon Jun 04, 2018 5:34 pm
Forum: Microscopes and optics
Topic: Leitz Orthoplan
Replies: 14
Views: 2190

Re: Leitz Orthoplan

Wow! I just got done writing a response to your questions about the field diaphragm being frozen and suggested you would perhaps be better off returning the Orthoplan, but now I read you ended up buying the Universal as well! I would agree with Charles comment it would be nice to have two of the 'b...
by JGardner
Mon Jun 04, 2018 5:07 pm
Forum: Microscopes and optics
Topic: Help Needed with Stuck Field Iris
Replies: 19
Views: 3123

Re: Help Needed with Stuck Field Iris

Mike, Thanks for your comments. My replies below... The mirror is loose from its mount in the base. This may have been caused by shipping the microscope. As I haven't looked closely at how the mirror is attached to the stand, I'm still not sure how to re-secure it--do you know how it's held in place...