Search found 3075 matches

by rnabholz
Tue Aug 18, 2020 3:09 pm
Forum: Specimens, samples and slides
Topic: Does anyone else have this sample collecting problem?
Replies: 13
Views: 1197

Re: Does anyone else have this sample collecting problem?

viewtopic.php?p=37601#p37601

And post 325 in the same thread has more info on it.

Good luck

Rod
by rnabholz
Mon Jul 20, 2020 4:29 pm
Forum: Pictures and Videos
Topic: A Few Diatom Pictures
Replies: 8
Views: 989

Re: A Few Diatom Pictures

Good Shootin' there Tex.
by rnabholz
Thu Apr 16, 2020 4:41 pm
Forum: Introduce yourself
Topic: First Time Microscope Owner in Minneapolis USA
Replies: 7
Views: 961

Re: First Time Microscope Owner in Minneapolis USA

Maybe a Model 33?

You should be able to find it (try page 20 - and lots of other cool stuff) in here:

http://webmight.com/~psneeley/downloads/AOBlueBook.zip
by rnabholz
Fri Apr 10, 2020 7:56 pm
Forum: Home-made microscope adaptations
Topic: Oblique Masks
Replies: 8
Views: 4334

Re: Oblique Masks

The effect is more a cousin to brightfield than darkfield, but I mention it because it offers another way to expand your scopes capabilities with almost no cost. Oblique delivers images that show depth and relief which can offer some great insight into your subjects Here are a couple of threads with...
by rnabholz
Thu Apr 09, 2020 8:56 pm
Forum: Microscopy accessories
Topic: Mask Carrier for Scopes Without
Replies: 13
Views: 4327

Re: Mask Carrier for Scopes Without

Glad it is working for you.

Here is another DIY that I have come to use a bunch.

viewtopic.php?p=42429#p42429
by rnabholz
Wed Apr 08, 2020 4:57 pm
Forum: Microscopy accessories
Topic: Mask Carrier for Scopes Without
Replies: 13
Views: 4327

Re: Mask Carrier for Scopes Without

Yes.

You may find the closer you can get the filter or mask to the bottom of the condenser, tbe better the effect will be.

The great thing about DIY is the experimentation. Good luck.

Rod
by rnabholz
Wed Apr 08, 2020 2:03 am
Forum: Illumination Techniques
Topic: Making a filter holder
Replies: 5
Views: 705

Re: Making a filter holder

Maybe something like this might work?

viewtopic.php?f=14&t=3606&p=33265#p33265
by rnabholz
Thu Jan 30, 2020 2:38 pm
Forum: Beginner's corner
Topic: New to hobby and have some questions
Replies: 6
Views: 3471

Re: New to hobby and have some questions

There should be some way to position a mask for darkfield, but you may need to get creative.

Here is the approach I took for one of my scopes. Maybe it will inspire you.

viewtopic.php?f=14&t=3606

Good luck
by rnabholz
Fri Dec 27, 2019 1:49 am
Forum: Microscopes and optics
Topic: American Optical Series 20 illumination
Replies: 5
Views: 780

Re: American Optical Series 20 illumination

Hey Pete I had the exact same issue when putting together my 20. Discovered the two versions with and without the stand offs. I wrote about it starting at entry 105 of this thread: http://www.microbehunter.com/microscopy-forum/viewtopic.php?f=24&t=776&start=90 Worth the bother though, great stand. G...
by rnabholz
Sun Jul 14, 2019 5:17 pm
Forum: Microscopes and optics
Topic: Looking for a User's Manual for American Optical Epistar scope.
Replies: 11
Views: 2818

Re: Looking for a User's Manual for American Optical Epistar scope.

Welcome back, Rod! Your reappearance even lured Kurt out from his cave :mrgreen: Over at photomacrography, people would usually remove that epi scope's specimen stage and put a small multidirectional goniometer stage to precisely position opaque subjects (typically insects). Here is an example: htt...
by rnabholz
Sun Jul 14, 2019 5:07 pm
Forum: Microscopes and optics
Topic: Looking for a User's Manual for American Optical Epistar scope.
Replies: 11
Views: 2818

Re: Looking for a User's Manual for American Optical Epistar scope.

Rod - don't know where you can find a manual, but the earlier industrial scopes (and I believe Xmission or someone has a manual for those) are essentially similar - certainly the same objectives. Looks to me like you could retrofit a condenser and transmitted illumination to that stand, perhaps usi...
by rnabholz
Sun Jul 14, 2019 4:57 pm
Forum: Microscopes and optics
Topic: Looking for a User's Manual for American Optical Epistar scope.
Replies: 11
Views: 2818

Re: Looking for a User's Manual for American Optical Epistar scope.

I'll tell you what would be a fun thing to do with it: sell it to me. :P :lol: Seriously, I just wrote our buddy Tom asking (more) questions about these stands (again), been wanting one for the past little while but have been consumed with rebuilding my antique house for the past 6 months, before i...
by rnabholz
Sat Jul 13, 2019 11:08 pm
Forum: Microscopes and optics
Topic: Looking for a User's Manual for American Optical Epistar scope.
Replies: 11
Views: 2818

Looking for a User's Manual for American Optical Epistar scope.

I am looking for a User's manual for this scope, An American Optical Epi scope. I believe it to be a model 1860 Epistar, but there is no badging on the scope identifying as such. I checked the Xmission AO pages - did not see what I was looking for there. I would be pleased with a PDF copy and willin...
by rnabholz
Mon Mar 18, 2019 9:15 pm
Forum: Pictures and Videos
Topic: Cyclopoid nauplius
Replies: 10
Views: 3164

Re: Cyclopoid nauplius

Outstanding 75!!

Just when I think you can't do any better, you raise the bar again.

Really beautiful work.

Rod
by rnabholz
Wed Jan 23, 2019 7:25 pm
Forum: Microscopy accessories
Topic: Slide ringing table
Replies: 16
Views: 6971

Re: Slide ringing table

Hi Bob, I guess form follows function. As I mentioned, I followed Kurt's lead, and it works very well. I agree that some extra mass in the table is a definite advantage. The VCR head works very, very well for this purpose. Mine will spin for just shy of 2 minutes before stopping completely, and over...
by rnabholz
Wed Jan 23, 2019 2:15 pm
Forum: Microscopy accessories
Topic: Slide ringing table
Replies: 16
Views: 6971

Re: Slide ringing table

MicroBob wrote:Hi Kurt,
your design is very nice especially as it is based upon widely availabe components.

Bob
Kurt's was the inspiration for mine.
Slide Ringing Table Finished 45.jpg
Slide Ringing Table Finished 45.jpg (90.48 KiB) Viewed 6766 times
RingingTableWork.jpg
RingingTableWork.jpg (145.39 KiB) Viewed 6766 times
by rnabholz
Wed Dec 05, 2018 11:59 am
Forum: Pictures and Videos
Topic: Gammarus spp In Different Lights
Replies: 3
Views: 1071

Re: Gammarus spp In Different Lights

Interesting fellow, don't believe I have ever seen one before.

Nice study in illumination effects too.
by rnabholz
Sat Dec 01, 2018 7:08 pm
Forum: Pictures and Videos
Topic: more Biddulphia pulchella
Replies: 16
Views: 2973

Re: more Biddulphia pulchella

Another winner 75.

Interesting to see it live and "assembled".

Great stuff, thanks for posting
by rnabholz
Sat Dec 01, 2018 12:29 am
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1924

Re: Oamaru IV

zzffnn wrote:Beautiful forms, thank you for sharing, Rob!
Thanks zz
by rnabholz
Fri Nov 30, 2018 2:18 pm
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1924

Re: Oamaru IV

All great images! I think I like the first one the best. Same with me. The non-uniform ornamentation pattern of the diatoms in the 2nd and 3rd images is intriguing: are the tiny holes blocked? by a calcareous precipitate? Thanks Hobby. Regarding the tri-lobed diatom, which I believe to be Tricerati...
by rnabholz
Fri Nov 30, 2018 2:10 pm
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1924

Re: Oamaru IV

75RR wrote:more really lovely images!

I see that they are numbered, is this part of a future ID project? Web page ... book?
Thank you 75.

The numbering is another go at organizing the images on my hard drive, no larger plan to clutter the world with my attempts at imaging.
by rnabholz
Fri Nov 30, 2018 2:43 am
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1924

Re: Oamaru IV

All great images! I think I like the first one the best. I take it you did a lot of image editing to eliminate background clutter? I think it does help the viewer to concentrate on the image. Great to see another 4 series user, too. Thanks Rick. Yes, I should have mentioned that I cleaned things up...
by rnabholz
Fri Nov 30, 2018 1:53 am
Forum: Pictures and Videos
Topic: Oamaru IV
Replies: 9
Views: 1924

Oamaru IV

More from the Oamaru New Zealand fossil sample

AO Apostar 4, 90x Apo, Oblique Mask, Canon 70D, Stacked using Zerene Stacker PMax routine
89µm
89µm
Oamaru 0395 ZS PMax Final.jpg (58.39 KiB) Viewed 1924 times
79µm
79µm
Oamaru 0364 ZS PMax Final.jpg (61.38 KiB) Viewed 1924 times
81µm
81µm
Oamaru 0376 ZS PMax Final.jpg (73.41 KiB) Viewed 1924 times
by rnabholz
Fri Nov 30, 2018 1:07 am
Forum: Pictures and Videos
Topic: Amoeba (arcella?) 'walking'
Replies: 14
Views: 2585

Re: Amoeba (arcella?) 'walking'

Very cool.

Agree with 75 - great idea to speed it up.
by rnabholz
Fri Nov 30, 2018 1:03 am
Forum: Pictures and Videos
Topic: Pleurosigma + 2 Anisonema vitrea
Replies: 8
Views: 1471

Re: Pleurosigma + 2 Anisonema vitrea

Oh my...........

Words fail.

You are killing it 75.
by rnabholz
Fri Nov 30, 2018 1:02 am
Forum: Pictures and Videos
Topic: A Darkfield Stop and a Diatom Slide
Replies: 2
Views: 996

Re: A Darkfield Stop and a Diatom Slide

Excellent - love to see this kind of experimentation.

I had good luck with stops with 10 and 20x objectives, at 40x it got to be a real trick getting the precise alignment and the stop size right.

Great job, keep posting your results.

Rod
by rnabholz
Wed Nov 28, 2018 3:20 am
Forum: Pictures and Videos
Topic: Oamaru III
Replies: 10
Views: 1904

Re: Oamaru III

MichaelG. wrote:
rnabholz wrote:Not 100% sure, but I believe it is a sponge spicule.
Thanks for that ^^^

Wikipedia endorses your belief:
https://en.m.wikipedia.org/wiki/File:De ... ersity.png
https://en.m.wikipedia.org/wiki/Sponge_spicule
MichaelG.
Well, there you go! Thanks Michael.
by rnabholz
Wed Nov 28, 2018 12:14 am
Forum: Pictures and Videos
Topic: Oamaru III
Replies: 10
Views: 1904

Re: Oamaru III

einman wrote:Very nice. Suitable for framing!
Thank you einman.
by rnabholz
Wed Nov 28, 2018 12:14 am
Forum: Pictures and Videos
Topic: Oamaru III
Replies: 10
Views: 1904

Re: Oamaru III

MichaelG. wrote:Please pardon my ignorance, but ... what is the first picture ?

It's quite an extraordinary shape.
[beautifully imaged]

MichaelG.
Hi Michael,

Not 100% sure, but I believe it is a sponge spicule.

Standing by for correction and illumination.