Search found 735 matches

by lorez
Wed Dec 06, 2017 3:35 am
Forum: Microscopes and optics
Topic: DIY Phase Telescope
Replies: 2
Views: 862

DIY Phase Telescope

Here is a quick way to look at the phase rings with your standard eyepieces. I used a piece of waxed paper backing from a roll of adhesive labels and some 3" wide clear packing tape. I made a tube that fit snuggly around the diameter of the eyepieces and slid one end of the tube on to the eyepiece i...
by lorez
Mon Dec 04, 2017 11:20 pm
Forum: Beginner's corner
Topic: Swift-Binoculars
Replies: 18
Views: 2649

Re: Swift-Binoculars

Interesting how some companies likes to put a spin on things. The Texas website explicitly states " for over fifty years Swift Instruments has been a global leader in the manufacture and production of quality microscopes", when in fact it sounds like the current company does not manufacture but the...
by lorez
Mon Dec 04, 2017 2:10 am
Forum: Beginner's corner
Topic: Swift-Binoculars
Replies: 18
Views: 2649

Re: Swift-Binoculars

I have no idea about any clash with James Swift & Son, but I will guess that Swift Instruments, Inc. with its own unique trademark is probably different enough. The Swift Instruments I worked with was a family held company that fell on some hard times and was liquidated in the early 2000s. The purch...
by lorez
Mon Dec 04, 2017 12:19 am
Forum: Beginner's corner
Topic: Swift-Binoculars
Replies: 18
Views: 2649

Re: Swift-Binoculars

I am not sure who made them, it could have been several factories ....lorez would know for sure. Thanks for the vote of confidence. The USA Swift company had its home office in Boston and the microscope warehouse was in San Jose, CA. The company started importing binoculars, telescopes, and consume...
by lorez
Mon Nov 27, 2017 12:08 am
Forum: Microscopes and optics
Topic: Any experience with OMAX?
Replies: 16
Views: 3015

Re: Any experience with OMAX?

not 31-27-28 : 31-74-28 You are correct. That's what happens when I multitask. I'm a bit confused about the specs you site on the bulb. Check here for their description: https://www.bulbworks.com/advancedSearch.php?searchType=simple&part_no=31-74-28 This discussion may fragment a bit as there are a...
by lorez
Sun Nov 26, 2017 7:13 pm
Forum: Beginner's corner
Topic: Pond aquarium
Replies: 26
Views: 3186

Re: Pond aquarium

Here is another, maybe a little better shot of the stalked ciliates. Again, the shot is heavily cropped to comply with the limits of the forum. Other than sizing there have been no other adjustments. As I recall the objective was a 20X phase plan achromat.

lorez
by lorez
Sun Nov 26, 2017 6:42 pm
Forum: Beginner's corner
Topic: Pond aquarium
Replies: 26
Views: 3186

Re: Pond aquarium

Those look like good places to start. The norweco site has photos that are excellent examples of what the wwt operators see. Maybe you can visit your local facility and beg for a sample. They take them regularly.

lorez
by lorez
Sun Nov 26, 2017 6:36 pm
Forum: Microscopes and optics
Topic: Any experience with OMAX?
Replies: 16
Views: 3015

Re: Any experience with OMAX?

It's not possible that you encountered examples of those Bristolines, where the correct bulb had been substituted by one that fit and worked but not properly, Lorez? Anything is possible, but in this case the bulbs used in the Bristoline are not the 31-74-28 which was used in the variety of scopes ...
by lorez
Sun Nov 26, 2017 3:24 pm
Forum: Beginner's corner
Topic: Pond aquarium
Replies: 26
Views: 3186

Re: Pond aquarium

That must be an interesting exercise ... Is there a simple 'look-up table' published, which we could access; or is a matter of expert knowledge ? Here is a highly cropped photo of the "stalked ciliate" that is representative of a healthy basin. The amorphous blob to the left of the ciliates is bact...
by lorez
Sun Nov 26, 2017 2:36 am
Forum: Beginner's corner
Topic: Pond aquarium
Replies: 26
Views: 3186

Re: Pond aquarium

Whatever critters disappear are always magically replaced with others,
I do a lot of work with wastewater treatment plants and this is the hallmark of their evaluations. When a certain species is present they know a certain condition exists.

lorez
by lorez
Sat Nov 25, 2017 11:59 pm
Forum: Microscopes and optics
Topic: Any experience with OMAX?
Replies: 16
Views: 3015

Re: Any experience with OMAX?

I've been following this thread a bit and have a couple of thoughts. First, at the prices asked, neither are a bad place to start assuming that you will grow in your skills and interest and replace it with something more suitable. I think the Chinese microscope, regardless of the brand, badge, name,...
by lorez
Sat Nov 25, 2017 11:31 pm
Forum: Beginner's corner
Topic: Pond aquarium
Replies: 26
Views: 3186

Re: Pond aquarium

Back in the day I kept aquaria for invertebrates with minimal to limited success. We discovered that maintaining the necessary balance required by the variety of specimens was difficult to impossible because everything needed something slightly different. My advice would be to do as you are thinking...
by lorez
Wed Nov 08, 2017 4:36 am
Forum: Specimens, samples and slides
Topic: asbestos counting
Replies: 2
Views: 1413

Re: asbestos counting

Hi jos32, It looks like you have a pretty interesting project in mind. I think I would use different collection methods than you are suggesting. If you are sampling the asbestos content in such things as the cement roofing material or gasket material I think a small, carefully excised sample would y...
by lorez
Tue Oct 31, 2017 4:36 pm
Forum: Beginner's corner
Topic: Viewing Red Blood Cells
Replies: 14
Views: 2240

Re: Viewing Red Blood Cells

It certainly does focus on the specimen. With some distance between the lens and slide, not almost touching. Is this objective in fact an oil type objective? If it is, how much better performance could I expect. When this condition exists your objective is full of oil. It is making an image, but no...
by lorez
Fri Oct 27, 2017 12:57 am
Forum: Beginner's corner
Topic: Microscope questions for beginners
Replies: 4
Views: 1504

Microscope questions for beginners

Hello all, For the last year I have been downsizing my assortment of microscopes and as part of the process have been giving suitable microscopes to aspiring young beginners who range in ages from 13 to 18. Tonight I was visiting with a friend's 13 year old son and asked if he had a microscope. He t...
by lorez
Fri Oct 20, 2017 3:37 am
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

Your Pensacola, Florida sand is 100% real to GPS coordinates and collected by a trusted microscopist (me) too :twisted: I have the sample properly documented and catalogued and in it's little display tube. The authenticity is beyond reproach. Surprisingly, I have only a couple of samples from Flori...
by lorez
Fri Oct 20, 2017 1:43 am
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

It is probably just me :roll:
Absolutely ! Whom else could it be ? That's what makes if fun. Everyone sees interesting things in different places.

lorez
by lorez
Fri Oct 20, 2017 1:36 am
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

I just bought some sand on Ebay This raises an interesting question... "who do you trust?" I imagine there is that unscrupulous entrepreneur who sees that fill sand from the home center looks a lot like that rare sand from just north of the Gobi. There are many collectors who caution against buying...
by lorez
Thu Oct 19, 2017 10:59 pm
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

What are your top 3 most interesting sand samples? I am just curious. That's a pretty tough question... all of them have aspects that are interesting. More than the sand, it is the story of acquisition. Although there are dozens of sites dedicated to sand "swapping" and collection with innumerable ...
by lorez
Thu Oct 19, 2017 1:46 am
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

I am quickly becoming a enthusiast but at this point my collection is comprised completely of a few sands I ahve collected locally (and I'm an hour from the coast!) and the sand from Dale We are in similar positions with respect to quantities of sand. Through the generosity of Dale and others I hav...
by lorez
Thu Oct 19, 2017 12:59 am
Forum: Specimens, samples and slides
Topic: Unsuccessful diatom collection kayak trip
Replies: 25
Views: 4909

Re: Unsuccessful diatom collection kayak trip

MichaelBrock,

Your fingernail polish mount looks much better than mine. I've been reading a variety of journal articles and one mentioned canada balsam as the mounting medium for their slides.

lorez
by lorez
Wed Oct 18, 2017 11:39 pm
Forum: Specimens, samples and slides
Topic: Unsuccessful diatom collection kayak trip
Replies: 25
Views: 4909

Re: Unsuccessful diatom collection kayak trip

I might have to go to Hobby Lobby to get the Glass Bond... it's worth a try. I tried the fingernail polish and was disappointed when using a compound scope (2X and 4X objectives). So far I like the dry mount best. I just have to make a new slide each time.

lorez
by lorez
Wed Oct 18, 2017 10:44 pm
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

Michael Brock, Very nice photos, Michael. I have a couple of questions. First, when magnification is mentioned, at what point is the calculation being done ? A scale bar would go a long way in clarifying size, but I completely understand the limitations of the point and shoot camera so this is not a...
by lorez
Fri Sep 22, 2017 6:05 pm
Forum: Pictures and Videos
Topic: Phase Contrast comparison
Replies: 14
Views: 1506

Re: Phase Contrast comparison

While I would agree that a controlled experiment should be limited to a single variable I do not see this comparison to be without value. Seeing the results from various instruments under a variety of circumstances give us an idea of what is possible and what limitations may exist. Thanks for postin...
by lorez
Thu Sep 21, 2017 11:00 pm
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

outlook does not like me. send a PM

lorez
by lorez
Thu Sep 21, 2017 9:07 pm
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

It looks as though I need an updated email.

lorez
by lorez
Thu Sep 21, 2017 8:18 pm
Forum: Specimens, samples and slides
Topic: Olivine from Hawaii
Replies: 31
Views: 7119

Re: Olivine from Hawaii

Please don't forget me.

lorez
by lorez
Thu Sep 21, 2017 7:59 pm
Forum: For forum members who want to buy and sell equipment
Topic: Downsizing... Liquidating
Replies: 13
Views: 2794

Re: Downsizing... Liquidating

This business of liquidating is more daunting than I'd hoped for. Since I was so bold to advertise I've had little time to actually work on it... in fact, and I hate to admit this, I've acquired a couple more scopes.

lorez
by lorez
Mon Sep 04, 2017 9:28 pm
Forum: My microscope
Topic: Manual wanted for Swift SRL microscope
Replies: 6
Views: 4278

Re: Manual wanted for Swift SRL microscope

Considering that the SRL was out of production many years ago and there were probably not too many sold on a global scale it's not surprising that manuals are rare. If you are looking for "how to use" information any generic instructions for using a binocular microscope should be helpful. Aside from...
by lorez
Mon Sep 04, 2017 2:28 am
Forum: Resources (online, books etc.)
Topic: The Freshwater Microscopist by Tony Pattinson
Replies: 7
Views: 4551

Re: The Freshwater Microscopist by Tony Pattinson

I don't get any kick-back from Tony either, but I have pestered him a little. After all, a recommendation from me is certainly worthy of some note... he did send me a note. Seriously, I will second Kurt's post as I also have the books and believe they are well worth the time and investment. I can al...