Search found 1400 matches
- Fri Apr 18, 2014 9:57 am
- Forum: Equipment Discussions
- Topic: Filters for protection of lenses in the field?
- Replies: 11
- Views: 5117
Thanks guys for your further input! The clear B+W filters that Craig has pointed to are just made for the purpose of protection of the front lens element, as it reads on schneiderkreuznach.com/fotofilter (B+W belongs to Shnyder-Krautsnack). Indeed Ken, the lens hood of this lens combined with its ex...
- Tue Apr 15, 2014 2:36 am
- Forum: Nature Photography -- Macro and Close-up
- Topic: A gregarious bunch on a tender Yellow Poplar twig.
- Replies: 6
- Views: 2085
Ken, a nice find! Looks like the larvae of meloid beetles to me. They have a quite interesting natural history, many of them being parasites or parasitoids in the nests of solitary bees and wasps. I find them regularly in and around my neck of the woods over here in springtime. --Betty P. S.: I'm gl...
- Sun Apr 06, 2014 4:01 am
- Forum: Equipment Discussions
- Topic: Filters for protection of lenses in the field?
- Replies: 11
- Views: 5117
- Fri Apr 04, 2014 6:20 am
- Forum: Equipment Discussions
- Topic: Filters for protection of lenses in the field?
- Replies: 11
- Views: 5117
Filters for protection of lenses in the field?
Finally, I took the plunge and helped myself to a modern close-up or 'macro' lens which I intend to use for field work. I settled for a "Sigma 150mm F2.8 APO MACRO EX DG OS". And now I'm pondering over permanently mounting a 72 mm filter for protection of the front lens element. Do the ones of you w...
- Fri Apr 04, 2014 12:57 am
- Forum: Favorite Locations
- Topic: Favorite Location of The Moment: My Backyard
- Replies: 4
- Views: 12859
- Wed Apr 02, 2014 2:20 pm
- Forum: Favorite Locations
- Topic: Favorite Location of The Moment: My Backyard
- Replies: 4
- Views: 12859
I find it always interesting to have a look at such far away places. You have a patch of beautiful vegetation there, David. Looks like some good hunting ground for bugs right on your doorstep! And I can well imagine John Wayne galloping alongside your fence. He should take care not to steer his quar...
- Sun Mar 30, 2014 2:55 pm
- Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
- Topic: Corallimorph + stereo
- Replies: 15
- Views: 14094
- Mon Mar 24, 2014 9:05 am
- Forum: Equipment Discussions
- Topic: Testing objective/lens
- Replies: 5
- Views: 2266
For standard tests to evaluate objectives often the fine structural details of the valves/shells of certain diatom species are used . For example: Triceratium favus for N.A. 0.15 and higher, Navicula lyra for N.A 0.30 and higher, Stauroneis phoenicenteron for N.A. 0.45 and higher, Pleurosigma angula...
- Mon Mar 24, 2014 8:44 am
- Forum: Photography Through the Microscope
- Topic: Cricket grinding mill
- Replies: 4
- Views: 1959
- Sun Mar 23, 2014 10:39 am
- Forum: Administrator's Appreciation Gallery...Macro and Close-up Images
- Topic: Two Bee(s) or not Two Bee(s)
- Replies: 7
- Views: 8409
- Fri Mar 21, 2014 11:53 pm
- Forum: General Discussion Forum and Community Announcements
- Topic: TED: "A 50-cent microscope made of paper"
- Replies: 3
- Views: 3920
- Thu Mar 20, 2014 2:31 am
- Forum: Equipment Discussions
- Topic: How to remove a "Collar?" from an objective?
- Replies: 13
- Views: 3125
I have a RMS to Nikon Microscope Objective Adapter to use if/when I can get that black ring off. :-k I don't understand why you'd wanna go via RMS at all. For mounting this objective on a tubelens (surrogate) I think you might want an adapter like this one here: http://www.ebay.com/itm/Nikon-CFI-M2...
- Sun Mar 16, 2014 1:53 pm
- Forum: Nature Photography -- Macro and Close-up
- Topic: Borneo part VIII
- Replies: 11
- Views: 2328
- Sat Mar 08, 2014 11:35 am
- Forum: Equipment Discussions
- Topic: Stacked enlarger lenses
- Replies: 15
- Views: 7248
I think most quality enlarger lenses are made in two sections. The 3 element back section simply unscrews to reveal the iris. If your iris is a simple metal plate with a f/2.8 hole then it should be no great problem to stick black paper plate over it with a smaller hole using double sided selotape....
- Sat Mar 08, 2014 10:29 am
- Forum: Equipment Discussions
- Topic: Stacked enlarger lenses
- Replies: 15
- Views: 7248