Search found 212 matches

by Zuul
Sat Jul 04, 2020 12:21 am
Forum: For forum members who want to buy and sell equipment
Topic: A.O. bits wanted
Replies: 40
Views: 2965

Re: A.O. bits wanted

Is there a significant difference between the 1096 and the 1096b? This listing says it is a 1096b: https://www.ebay.com/c/9003206223
by Zuul
Fri Jul 03, 2020 5:07 pm
Forum: Pictures and Videos
Topic: Cyanobacteria in Freshwater ponds
Replies: 6
Views: 980

Re: Cyanobacteria in Freshwater ponds

Great images! I really appreciate that you add the technique and objective info.
by Zuul
Thu Jul 02, 2020 9:53 pm
Forum: Microscopes and optics
Topic: B&L Balplan
Replies: 27
Views: 3061

Re: B&K Balplan

I have quite a few catalogues but not the capacity to scan them currently. That should change by fall. Adobe has a shockingly good smartphone app that “scans” using the camera. It is cleverly named Adobe Scan. It allows you to crop and correct keystone distortion and even converts to text (OCR) whe...
by Zuul
Thu Jul 02, 2020 8:20 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 64
Views: 8338

Re: New Diatom Project

Fascinating process. Big thanks for sharing with us! I think you have demonstrated that this is not an aspect of the hobby I should pursue. I’m far, far too impatient. But, if you have any slides in your “junk” pile that aren’t up to snuff, let me know. I’m sure that even slides you are unhappy with...
by Zuul
Thu Jul 02, 2020 12:54 am
Forum: Introduce yourself
Topic: Microphotography newbie
Replies: 24
Views: 2542

Re: Microphotography newbie

All posts will be in chronological order. The easiest and best way to respond to specific posts is to push the little quote (“) symbol at the top right of a post. That will copy their text into your reply and make them aware of the reply.
by Zuul
Wed Jul 01, 2020 5:52 am
Forum: Introduce yourself
Topic: Microphotography newbie
Replies: 24
Views: 2542

Re: Microphotography newbie

Welcome! I live in the Bay Area, too. (South Bay) You will find some of the members are practically encyclopedias of knowledge and very happy to help.
by Zuul
Thu Jun 25, 2020 8:54 pm
Forum: Pictures and Videos
Topic: My First Attempts at Digital Photomicrography
Replies: 44
Views: 4182

Re: My First Attempts at Digital Photomicrography

Timemaster1212 wrote:
Thu Jun 25, 2020 6:05 pm
Is it common for a filter to increase image exposure time dramatically?
An 80A photo filter reduces light by about 2 and 2/3 stop. That is the blue filter you would use to correct tungsten to daylight balance, so should be similar to what is in your scope.
by Zuul
Wed Jun 24, 2020 11:09 pm
Forum: Introduce yourself
Topic: new to microscopy need help properly identifying my microscope
Replies: 13
Views: 1982

Re: new to microscopy need help properly identifying my microscope

I am happy to be wrong [by consensus] but I always thought that the acceptable limits for dioptre adjustments would be what the manufacturer provides. ... and I don’t think I have ever seen an eyepiece with +/- 7 range. MichaelG. Do you have a 7 diopter difference between your right and left eye? T...
by Zuul
Wed Jun 24, 2020 11:05 pm
Forum: Introduce yourself
Topic: New from Las Vegas, NV
Replies: 5
Views: 1077

Re: New from Las Vegas, NV

i recall seeing a video where for starting out oil immersion techniques were advanced and not for newbies like me. It’s not that oil immersion is advanced in the sense that it is hard. It’s just extra steps to clean up, and many (particularly newbies) would rather not have that extra task. I just g...
by Zuul
Wed Jun 24, 2020 2:58 am
Forum: Pictures and Videos
Topic: My First Attempts at Digital Photomicrography
Replies: 44
Views: 4182

Re: My First Attempts at Digital Photomicrography

No i do not at all. This too looks better than the original, however it is still lacking crispness. Maybe at this point the objectives do matter? That image was shot at 43x, so resolution should already be low correct? If so would, for example, an APO objective perform remarkably better? “Remarkabl...
by Zuul
Tue Jun 23, 2020 6:12 pm
Forum: Camera systems and imaging
Topic: Microstar IV Camera Setup
Replies: 30
Views: 4401

Re: Microstar IV Camera Setup

The opposite. The Neoplan objectives were a more budget friendly 45mm adaption of some of the 34mm designs. They were pitched at institutional use; schools etc. They are not quite plan at 20mm, somewhere between semi-plan and plan. Wouldn't a simple "achromat" imply the objective is not particularl...
by Zuul
Tue Jun 23, 2020 3:58 pm
Forum: Camera systems and imaging
Topic: Microstar IV Camera Setup
Replies: 30
Views: 4401

Re: Microstar IV Camera Setup

With achromats I'm sure some CA is expected True, but the Neoplans should be better in this regard. I’m following with great interest having recently received a Microstar IV of my own. Unfortunately, my plans have been slowed by a cracked lamp socket. It was working when I received the scope, but d...
by Zuul
Tue Jun 23, 2020 12:36 am
Forum: Collecting microscopes and slides
Topic: Interesting Slide!
Replies: 16
Views: 4085

Re: Interesting Slide!

I don’t pretend to have any idea why it was made that way, but I can’t imagine that is was accidental. The taper is too pronounced to be overlooked.
by Zuul
Mon Jun 22, 2020 11:18 pm
Forum: Microscopes and optics
Topic: Focus loss upon microscope stage movement
Replies: 18
Views: 2087

Re: Focus loss upon microscope stage movement

If I understand your description, there is a point in the travel of the mechanical stage where the focus abruptly shifts. Does it happen at exactly the same place every time you move the mechanical stage? If you lightly rest a finger on the stage and move it past that point, can you feel a bump or o...
by Zuul
Sat Jun 20, 2020 3:16 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

.926 is 85% of 1.080. For 5% tolerance resisters, that is well out of spec. Maybe I’m too picky, but that level of error indicates a faulty meter in my mind.
by Zuul
Sat Jun 20, 2020 3:09 pm
Forum: Specimens, samples and slides
Topic: Diatom selection experience
Replies: 38
Views: 6760

Re: A tip and a question about a slide of clean diatoms without silt

Hobbyst46 wrote:
Sat Jun 20, 2020 2:32 pm
since animal eyelashes or hairs and pulled glass needles are inaccessible to me
You don’t have eyelashes? (Sincere apologies if you suffer alopecia.)
by Zuul
Sat Jun 20, 2020 3:05 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

4 x 270 Ohm resisters in series should read over 1k Ohm. Your meter is not working. You should be able to read any one of the resisters within a couple percent of the nominal resistance, so quite easy to test.
by Zuul
Sat Jun 20, 2020 1:17 am
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

There is almost zero risk in experimenting with whatever pot you have handy. All (normal?) pots go to zero Ohms, so you can’t overdrive the circuit beyond it’s designed voltage/current. Worst case scenario if you have one rated too high is the adjustment will be extremely sensitive (and most of the ...
by Zuul
Fri Jun 19, 2020 8:25 pm
Forum: Home-made microscope adaptations
Topic: American Optical LED Conversion
Replies: 5
Views: 2073

Re: American Optical LED Conversion

I thought I had ordered 4000K LED's but you're absolutely right, these are way off from where I expected these to be and just seemed to not notice. It's for the time being still pretty nice but I would like to get my light a bit more accurate if I did go for a higher power LED In my experience, 5mm...
by Zuul
Fri Jun 19, 2020 4:00 pm
Forum: Home-made microscope adaptations
Topic: American Optical LED Conversion
Replies: 5
Views: 2073

Re: American Optical LED Conversion

The LED I'm using is quite white(neutral white), far better than the very warm white from the original bulb, I'm not sure why it looks so blue in the picture but there are quite a few different color temperatures available for LEDs I have a standard 5mm LED rated at 15,000 mcd, I'm not sure how tha...
by Zuul
Thu Jun 18, 2020 8:13 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

15k Ohm is a decent guess based on your partial measurements.
by Zuul
Thu Jun 18, 2020 8:10 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

Can you measure with one probe on the right-most contact and the other probe on the left-most contact? That is the value you are after. X to X in your diagram.
by Zuul
Thu Jun 18, 2020 6:46 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

Can you get a measurement across the outer 2 contacts? That will tell you the value of the pot. Pot.jpg The dark grey area in the outer ring is the resistor material. When the wiper bridges from the middle ring to the outer near a contact, it doesn't travel through the resister at all. Bridging from...
by Zuul
Thu Jun 18, 2020 3:29 pm
Forum: Microscopes and optics
Topic: Potentiometer Replacement, Leitz 050250/1172 PWR Source
Replies: 28
Views: 3263

Re: Potentiometer Replacement, Leitz 050250/1172 PWR Source

If it is truly dead, and you don’t mind a “no return” option, you could open it up and meter the contact disk directly. The fact that cleaning helps, even briefly, says to me that the wipers are the problem. If that’s true, getting an accurate measurement should even possible. The resistance from on...
by Zuul
Thu Jun 18, 2020 2:16 pm
Forum: Identification help
Topic: Amoeba? (Marine sample)
Replies: 8
Views: 1729

Re: Amoeba? (Marine sample)

Choanoflagellate Colony? Dead or nearly so.
by Zuul
Tue Jun 16, 2020 8:54 pm
Forum: Microscopes and optics
Topic: First Microscope
Replies: 6
Views: 2063

Re: First Microscope

The links are not working. Maybe best to just post the model number.
by Zuul
Tue Jun 16, 2020 3:56 am
Forum: Illumination Techniques
Topic: Jamin-Lebedeff Interference Contrast Microscopy
Replies: 19
Views: 3277

Re: Jamin-Lebedeff Interference Contrast Microscopy

While I find these really cool from an aesthetic perspective, I’m struggling a bit to see the practical application of this technique. What would this method reveal that others do not?
by Zuul
Sat Jun 13, 2020 5:38 am
Forum: Illumination Techniques
Topic: Could i get a cooler bulb?
Replies: 34
Views: 4323

Re: Could i get a cooler bulb?

I couldn’t find any information on the lighting set up of that scope, and I don’t have first hand experience with anything similar, so it’s hard to give good advice. Some scopes use carefully engineered optics to focus directly on the bulb’s filament. Putting any old LED replacement bulb in those wi...
by Zuul
Wed Jun 10, 2020 11:13 pm
Forum: Illumination Techniques
Topic: Could i get a cooler bulb?
Replies: 34
Views: 4323

Re: Could i get a cooler bulb?

LED retrofits are popular, but need to be done properly to maintain optical performance. What kind of scope is it? That will help folks point you in the right direction.
by Zuul
Wed Jun 10, 2020 8:41 pm
Forum: Illumination Techniques
Topic: Best Polarizing Filters
Replies: 11
Views: 2131

Re: Best Polarizing Filters

Heh, maybe these days, but I have bought a bucket of surplus filters a few decades old for a pittance and they are all linear. Could be an age thing. I don't remember the exact reason, but I thought "pure" polarized light messed with phase detect focus or something like that. That means circular wo...