Search found 2713 matches

by zzffnn
Thu Jan 17, 2019 1:51 pm
Forum: Collecting microscopes and slides
Topic: Swift FM-31 field microscope
Replies: 45
Views: 20562

Re: Swift FM-31 field microscope

I have seen small single lens condensers used on educational microscopes for up to NA 0.65 (40x objective) and wonder if those lenses can be purchased alone for DIY field microscope.
by zzffnn
Wed Jan 16, 2019 4:38 pm
Forum: Collecting microscopes and slides
Topic: Swift FM-31 field microscope
Replies: 45
Views: 20562

Re: Swift FM-31 field microscope

Bob, Your Zeiss Winkel, Meopta and Reichert field scopes are single objective short tube types without condenser, right? Would that be difficult to share a photo of them? Ergonomics wise, we may need a folding tripod scope that is almost regular size for comfortable field use. Tiyoda MKH is probably...
by zzffnn
Wed Jan 16, 2019 4:46 am
Forum: Collecting microscopes and slides
Topic: Swift FM-31 field microscope
Replies: 45
Views: 20562

Re: Swift FM-31 field microscope

Thanks for sharing. I did not know that 40x is only for 0.17mm cover. I vaguely remember some FM-31s have a single lens condenser, but some don't. For the 40x objective, that condenser should help quite a bit. Maybe one can DIY a light using those pen-like flashlights. Maglite Solitaire as an example.
by zzffnn
Wed Jan 09, 2019 9:44 pm
Forum: Microscopes and optics
Topic: My new (old) microscope and a couple of questions
Replies: 30
Views: 4572

Re: My new (old) microscope and a couple of questions

Yes, that microscope head provides additional 1.25x magnification. The Nikon plan apo 60/0.9 is a valuable objective, but you need to match correction collar with actual cover thickness (many times it may not be exactly 0.17mm; at dry NA of 0.9, there is not much room for error). To get the best fro...
by zzffnn
Tue Jan 08, 2019 11:42 pm
Forum: Beginner's corner
Topic: bought used Zeiss on ebay - did I get a good deal?
Replies: 15
Views: 3935

Re: bought used Zeiss on ebay - did I get a good deal?

Definitely check for delamination (which is common among old Zeiss optics). Hold objective, point its tip to oblique light source or sky without sun , examine from objective bottom and check for funny-looking layers of colors. I apologize for overlooking that 16/0.5 objective as well; I should have ...
by zzffnn
Tue Jan 08, 2019 2:30 pm
Forum: Introduce yourself
Topic: New member here from central Mass. USA
Replies: 5
Views: 2313

Re: New member here from central Mass. USA

Member @apochronaut may be able to provide you some microscopy help related to Lyme disease.
by zzffnn
Tue Jan 08, 2019 2:21 pm
Forum: Introduce yourself
Topic: New member here from central Mass. USA
Replies: 5
Views: 2313

Re: New member here from central Mass. USA

Sorry to hear your trouble with the condition. I am a microbiologist and have some concerns about your intent. As of 2013, culturing and identifying Borrelia burgdorferi is not an easy task even in a professional lab (that may be why it took you 3 trips): https://www.ncbi.nlm.nih.gov/pmc/articles/PM...
by zzffnn
Tue Jan 08, 2019 2:27 am
Forum: Beginner's corner
Topic: bought used Zeiss on ebay - did I get a good deal?
Replies: 15
Views: 3935

Re: bought used Zeiss on ebay - did I get a good deal?

Welcome to the forum. Hard to say if you got a good deal or not. If it turns out to be junk (for example, delaminated optics, missing fluorescence filter/cube, no phase condenser, seized/broken focus drive), you won't be able to recover much of your investment. Simply return it back to seller under ...
by zzffnn
Sat Jan 05, 2019 1:46 pm
Forum: Pictures and Videos
Topic: Diatom Samples from the Netherlands.
Replies: 11
Views: 2082

Re: Diatom Samples from the Netherlands.

Rob, Michael Shribak has more than one patent: http://www.mbl.edu/bell/current-faculty/shribak-lab/ Maybe the embodiments (details) you were looking for are in his previous patent(s), rather than the one you read? A patent examiner usually won't allow a patent to be issued, if it lacks details signi...
by zzffnn
Mon Dec 31, 2018 2:06 am
Forum: Beginner's corner
Topic: Where do they come from?
Replies: 4
Views: 1587

Re: Where do they come from?

They most likely come from your "hay" or "water grass", if you use boiled water without any other pond ingredients and cover lids all the time. Air transportation to your culture jar is not impossible though.
by zzffnn
Mon Dec 31, 2018 2:03 am
Forum: Beginner's corner
Topic: Hematoxylin
Replies: 4
Views: 1440

Re: Hematoxylin

Chemical structure of the hematoxlyin does not look very stable (it may be prone to oxidation - so store it away from heat and light). Complex formation with aluminum compounds may make it more stable, but still. Note its original color; if the whole bottle completely changes color, then it won't wo...
by zzffnn
Sun Dec 30, 2018 11:57 pm
Forum: Microscopes and optics
Topic: Nikon 20x Apo infinity
Replies: 2
Views: 927

Re: Nikon 20x Apo infinity

They were just talking about this same objective at the other forum: http://www.photomacrography.net/forum/v ... 72&start=0

Note it works best with 2-3 0.17mm cover slips, not 1 or 0.
by zzffnn
Sun Dec 30, 2018 3:54 pm
Forum: Miscellaneous
Topic: Lomo MBD-1 Field Microscope
Replies: 3
Views: 2393

Re: Lomo MBD-1 Field Microscope

My LOMO scope looks like that D11. It weights about 9 lbs with bino head (or 7 lbs with mono head) and without that heavy solid metal case, if I remember correctly. I don't like its fine focus drive's limited travel range, so I only use it as a portable. Its removable objective turret is nice, but f...
by zzffnn
Fri Dec 28, 2018 2:11 am
Forum: My microscope
Topic: My Wild-Nikon-Leitz frankenscope
Replies: 13
Views: 5161

Re: My Wild-Nikon-Leitz frankenscope

Viktor,

When you said APSC Canon sensor "needs approximately a 1.6x relay magnification", did you mean this:

26.70 mm diagonal length of sensor / 18mm (assumed) view field of microscope objective = 1.48 (relay magnification)

Cheers,
Fan
by zzffnn
Thu Dec 27, 2018 3:18 pm
Forum: My microscope
Topic: My Wild-Nikon-Leitz frankenscope
Replies: 13
Views: 5161

Re: My Wild-Nikon-Leitz frankenscope

Viktor, Sorry, my numbers were off. I will blame it on my jet lack :twisted: You and Hobbyst46 are both right, you need either: 1) APSC Canon sensor - 40mm camera lens coupled closely over CFW10 eyepiece - distance to objective shoulder that makes the CFW10 in trinocular tube parfocal with the CFW10...
by zzffnn
Thu Dec 27, 2018 3:45 am
Forum: My microscope
Topic: My Wild-Nikon-Leitz frankenscope
Replies: 13
Views: 5161

Re: My Wild-Nikon-Leitz frankenscope

Viktor, 1.4x teleconverter simply enlarges image circle 1.4x. So it can be used with either afocal or direct projection. With your Nikon CFN objectives or any "self-corrected" objectives, direct projection can be used (eyepiece is not necessary). For objectives that requires eyepiece compensation, a...
by zzffnn
Thu Dec 27, 2018 1:53 am
Forum: My microscope
Topic: My Wild-Nikon-Leitz frankenscope
Replies: 13
Views: 5161

Re: My Wild-Nikon-Leitz frankenscope

Viktor, I like your frankenscope very much and respect your passion and talent as well! I have some questions and comments for you: 1) How do you like the image quality of your Heine at NA 0.95 under circular oblique light vs your Wild Achr Apl condenser at the same NA under offset oblique light, fo...
by zzffnn
Thu Dec 27, 2018 1:03 am
Forum: Pictures and Videos
Topic: HMC vs Oblique - first light
Replies: 1
Views: 955

Re: HMC vs Oblique - first light

Thank you for the nice comparison, Viktor! Your images are very helpful to me.
by zzffnn
Sun Dec 09, 2018 6:28 am
Forum: Pictures and Videos
Topic: Diatoms
Replies: 10
Views: 2025

Re: Diatoms

My mistake, sorry about that.

A side by side comparison of HMC vs oblique would be nice.
by zzffnn
Sat Dec 08, 2018 3:47 pm
Forum: Pictures and Videos
Topic: Diatoms
Replies: 10
Views: 2025

Re: Diatoms

Very nice, thank you for sharing! I would like to see a diatom comparison between HMC and offset oblique, if possible. A separated flat Gyrosigma would work well for that comparison. Looking at the above Gyrosigma in HMC though, it does seem that HMC may have reduced aperture by too much, such that ...
by zzffnn
Fri Nov 30, 2018 8:17 pm
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1541

Re: Oamaru IV

Beautiful forms, thank you for sharing, Rob!
by zzffnn
Sat Nov 10, 2018 12:57 am
Forum: Microscopes and optics
Topic: On the Used Scope Question
Replies: 19
Views: 2716

Re: On the Used Scope Question

With $400 for 3 kids and photography, I would suggest a teaching microscope, with scope heads separated on at least two stands, like this: https://www.worthpoint.com/worthopedia/spencer-ao-teaching-microscope-quad-4-head-1049 With a teaching scope, you can put on 1 monocular head and one binocular h...
by zzffnn
Fri Nov 09, 2018 8:50 pm
Forum: Microscopes and optics
Topic: On the Used Scope Question
Replies: 19
Views: 2716

Re: On the Used Scope Question

Welcome to the forum, Jonathan. To help you better, please kindly tell us what are your subjects of interest and what is your budget? It makes a difference, your budget is $600 vs $3000. Quite some DIY is necessary, with a budget of $600. But if you want to spend $3000 and know you will stay in the ...
by zzffnn
Thu Nov 08, 2018 10:33 pm
Forum: For forum members who want to buy and sell equipment
Topic: M43 lens for afocal photomicrography Sigma 30mm
Replies: 0
Views: 1527

M43 lens for afocal photomicrography Sigma 30mm

For sale is a good condition Sigma 30mm F/2.8 DN Lens For Micro Four Thirds (current generation Olympus and Panasonic) cameras. It works well with 10x microscope visual eyepiece. I connect it with eyepiece using step down lens adapter ring and super glue. Typical images produced this way can be foun...
by zzffnn
Tue Oct 30, 2018 12:48 am
Forum: Pictures and Videos
Topic: pond life,beginer's pictures
Replies: 17
Views: 3764

Re: pond life,beginer's pictures

I could be wrong (and I don't know for sure); that could be a diving beetle.

I am curious what that "I dont know 200x" is. A predatory ciliate? @Bruce Taylor or Josh will likely know.
by zzffnn
Fri Oct 26, 2018 1:03 pm
Forum: Pictures and Videos
Topic: Cyanobacteria - Gloeotrichia
Replies: 17
Views: 3955

Re: Cyanobacteria - Gloeotrichia

Great images!
Advantage of fluorescence imaging can be clearly seen with this subject.
by zzffnn
Thu Oct 25, 2018 1:50 am
Forum: Pictures and Videos
Topic: Oamaru II
Replies: 9
Views: 1592

Re: Oamaru II

Fascinating! Nice work, Rod!
by zzffnn
Wed Oct 24, 2018 11:40 pm
Forum: Off Topic
Topic: Some Hurricane Michael Damage:
Replies: 5
Views: 3393

Re: Some Hurricane Michael Damage:

Rodney,

Good to hear that you are safe.

I am surprised a category 1 hurricane can cause that much damage. I want to remove those two young oak trees in front my house, precisely for this reason. But I heard our HOA won't let us do that.
by zzffnn
Wed Oct 24, 2018 10:28 pm
Forum: Pictures and Videos
Topic: Oamaru New Zealand Fossil Diatoms
Replies: 15
Views: 1932

Re: Oamaru New Zealand Fossil Diatoms

The first form is really cool. Thank you for sharing, Rod.
by zzffnn
Tue Oct 23, 2018 12:47 am
Forum: Specimens, samples and slides
Topic: Of diatoms and air bubbles
Replies: 32
Views: 7268

Re: Of diatoms and air bubbles

Rod, My apologies. I did not mean to call you out. I meant to say that Hobbyst46 should not expect his phase-NOA61 photos to be as dot-resolving as your brightfield-Pleurax photo, as many factors are different. Apparently, he already knew that and had a slightly different purpose (which was initial ...