PREVIEW YG Archive - 2007 - January-June +----------------------------------------------------------------------------------- 34416 From: "Phil" Date: Jan 1, 2007 Subject: Re: Many thanks Hi Riccardo, You are welcome. I randomly select a new photo based on clarity and resolution worthy of our Group's homepage. Your pic met that criterion. Good job!. And a Happy New Year to you and all of our Group Members. Phil +--------------- 34417 From: "Rik Littlefield" Date: Jan 1, 2007 Subject: Re: looking for info about aus Jena scope, especially repl. bulbs > "By the way, I failed to ask about possibilities for getting > a trinoc head for this scope." > ... >...the Lomo trinos fit.... [Ray] > The tri- and binoculars are one of the things Lomo did right. [Don] Thanks for the info, guys -- a big help! I will keep my eyes open for options. --Rik +-------------- 34418 From: "microhans2000" Date: Jan 1, 2007 Subject: Re: Amphipluera Pellucida - the debate rolls on! Hi David, I never made stereo pairs with the SEM because we where not involved in that but I see no problem. The stage is easily controlled. It would be fun to do. And stereo view is indeed amazing. So yes, no problem. Hans +----------------- 34419 From: "scitech200" Date: Jan 1, 2007 Subject: Re: Amphipluera Pellucida - SEM sample Hello Hans & Peter, Thank you very much for making your outstanding images available to us! Although the group's primary interest is optical microscopy, it's always very interesting to see comparative, or complementary, images - in particular SEM images with their inherently superior depth of field (view?). Also, there are some group members that have SEMs in their hobby space.... Hans: Being an inquisitive guy, I noted in an earlier post that you did not coat the diatom sample with a highly conductive material such as gold - which is normally required for SEM operation? I know that Rene's Ap sample used for some SEM images (now being used by DonW with a LOMO light microscope) was gold coated. So I assume that you have an alternative "coating" that can be used with your particular SEM setup? Or do these diatom images rely upon a special technique that you have perfected? Of course such a technique opens up a whole lot of interesting possibilities re samples. Thanks for any additional SEM sample information you may be willing to share, and all best wishes for the New Year. Hans & Peter: Re the Ap sample, it may be worth contacting Klaus Kemp in the UK. I believe he is still preparing slides that include a single Ap diatom. His work is well known and his prices are very reasonable. Regards, Keith [ It is uncoated imaged with a FEI XL30 SFEG ] +----------------------- 34420 From: "microhans2000" Date: Jan 1, 2007 Subject: Re: Amphipluera Pellucida - SEM sample Hi all, It is always difficult to image non-conducting samples in a SEM but a low voltage and a low current and fast scanning can help a lot. The diatoms are mounted on a carbon sticker only the diatom can charge and not the surroundings; mount on a cover glass without a coating is too much. I do not like gold coatings because they introduce small islands of crystallites; a mix of Pt and Au gives less structure in the coating. So the best thing would be to have clean material that I can mount on a carbon sticker. I live in the Netherlands. You can find my mail address in the group member-database to contact me for address information. Hans +----------------- 34421 From: Gary Bennett Date: Jan 1, 2007 Subject: Re: A little help identifying this microscope? The bulb you have is a GE 1630. Rated at 6.5 volts, 2.77 amp, 18 watts. More info here: http://www.servicelighting.com/catalog_product.cfm?prod=EK40311 The AO 650 transformer is rated at 6.5 volts, 4 amp, 26 watts. As long as your transformer is rated at or above the bulbs rating it will work, the 650 will work. The AO 650 is infinitely variable from 0 to 6.5 volts, which is a nice feature. The 650 was sold under both the AO and Reichert names. You could also use an AO 365 but this transformers output is stepped at 5.5, 6.0 and 6.5 volts. It is rated at 23 watts and also has the bi-pin socket. If you go shopping on ebay for the 650 be aware that a model 556 and 655 exists that looks identical but are rated to only 6 volts. Hope this helps! Gary:) +------------------------------------------------------------------------------------ +------------------------------------------------------------------------------------ 35059 From: Don Williams Date: Feb 1, 2007 Subject: Re: More hints for a Newcomer I am not a Lomo freak. I just happen to have some of their equipment. But there is nothing much wrong with their optics. The Achromats, with the way I have things set up, give a perfectly flat field over the Webcam frame. And so just for the hell of it I got out one of the old Soviet era Lomo 90/1.25 Achromats and took some pictures of A pellucida. Total time taken about ten minutes plus five to move them into the Picassa Web album here: http://picasaweb.google.com/don.donwilliams/Photomicrographs/photo#5026499098392\ 169874 Details for this image and the following 8: Lomo 90/1.25 160/0.17 Achromat; condenser Lomo Aplanatic 1.4; Periplan 12.5X photo eyepiece; Trinocular Magnification 2.6X; Camera the Logitech Quickcam Pro 4000 with 12mm Marshall lens. The lamp is a 12/100 Halogen in a modified housing and illumination was set up for Köhler. I fiddled about with filters --> blue and light blue and focus between exposures. Oblique light achieved by using an offset intermediate lens. Look at the top right hand corner of some of the pictures -- you should see indistinct dots. Don W +---------------- 35060 From: "rvanwezel" Date: Feb 1, 2007 Subject: filter mountant advice Guys, I want to mount my polaroid filters between (cover) glass, so that they won't scratch. I've tried an aqueous mountant (Hydromount, National Diagnostics), probably a PVA mountant. I discovered (in the end of course) the stuff seems birefringent... What's the recommended stuff to mount these plastics?? Thanks, René. +----------------- 35061 From: "scitech200" Date: Feb 1, 2007 Subject: Re: More hints for a Newcomer - Ap pics Don, Impressive images. Which slide: Rene, Carter, KKemp-7, other? I see they are 1280x960 interpolated resolution with the Logitech webcam, and I assume no post processing? -Keith Don Williams wrote: > And so just for the hell of it I got out one of the old Soviet era > > Lomo 90/1.25 Achromats and took some pictures of A pellucida. +--------------- 35062 From: "stevenbornsfv" Date: Feb 1, 2007 Subject: Nikon S turrets I own a Nikon SKe and a Nikon S. I wanted to mount a 20x Nikon objective which I had acquired onto my SKe. When a quintuple turret (off of a black Nikon) came up on eBay, I purchased it When the five-position turret arrived yesterday, it was different from the four-position turret on my SKe, in that it had a dovetail adapter. I have never seen Nikon SKe era scopes with dovetails on the turret before. Was it common for the black Nikon S era scopes to have the capability to switch turrets in an out with a dovetail? BTW, I removed and saved the dovetail adapter, and the five-position turret worked just fine. Steve +----------------- 35063 From: "stevenbornsfv" Date: Feb 1, 2007 Subject: Origins of Lomo Don A bit off the subject, but... I had heard that Lomo was started in the Soviet Union by former Zeiss employees relocated to Russia after WW2, similar to their relocation of the German rocket scientists. Is that true? "Don Williams" wrote: > I am not a Lomo freak. I just happen to have some of their equipment. > But there is nothing much wrong with their optics. +------------------------------------------------------------------------------------ +------------------------------------------------------------------------------------