Search found 7764 matches

by ChrisR
Tue Mar 17, 2009 11:39 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Leitz paperweight?
Replies: 40
Views: 14714

INteresting stuff. "Mysteries abound" Only when you know what you're talking about :wink: It often seems to me that when dealing with the unknowing people :oops: you have to build in the F factor. "Fudge", "finger", or anything beginning with the same letter. I can supply a non- Drosophila organism ...
by ChrisR
Tue Mar 17, 2009 5:23 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Leitz paperweight?
Replies: 40
Views: 14714

Thanks again Charles. Yes Ill do some test shots. You'll not be surprised to hear another 10 buck lens has arrived, a LWD 20/0.3, so I can compare them, before they probably both go on ebay. Unfortunately Rik's "CF N Plan Achro 10X NA 0.30 microscope objective. That objective, which cost $100" isn't...
by ChrisR
Tue Mar 17, 2009 5:01 pm
Forum: Equipment Discussions
Topic: HOW much?
Replies: 5
Views: 2623

Thanks again, Rik I see. Hmmm. For my box (D700) I get 155ish lpp/mm so I'm not being quite so demanding of the glass. I don't know what the figures are though for my lenses, which are all getting on a bit- 20/24/28/55 2.8, 35/2, 50 1.8. When I get hold of a UMN 28 (I think that was it, on Fluor Dou...
by ChrisR
Tue Mar 17, 2009 10:38 am
Forum: Equipment Discussions
Topic: HOW much?
Replies: 5
Views: 2623

Those are indeed interesting, as are 2 or 3 other comparisons on the site. One included a Mamiya standard 50/1.8, value approximately a button, which wasn't too bad . One method on which I've not seen much discussion, is reversing common retrofocus prime lenses, say the range 20 to 35mm. ( Maybe eve...
by ChrisR
Tue Mar 17, 2009 5:20 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: The Art of Making Ping Pong Ball Diffusers
Replies: 19
Views: 9741

To have serious fun with ping pong balls you need to nitrate the cellulose. You may find the Nitric Acid fairly hard to buy, these days. I'd tell more but I'd probably get banned. For smaller holes these hole punches work well http://i5.ebayimg.com/04/i/000/b2/68/0598_1.JPG The sets come on two rang...
by ChrisR
Tue Mar 17, 2009 4:56 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Leitz paperweight?
Replies: 40
Views: 14714

Now I've bought this: It was expensive so it must be good, right? If I tape a yoghurt pot to the front of it and glue it to a body cap will it be OK? Wil I need to paint the yoghurt pot black?http://img11.imageshack.us/img11/6943/116034e453446.jpg Seriously folks, I thank you for your time. I seem t...
by ChrisR
Mon Mar 16, 2009 12:00 pm
Forum: Equipment Discussions
Topic: HOW much?
Replies: 5
Views: 2623

HOW much?

With respect to true macro & bellows lenses, it seems they're all 1) hard to find, and 2) expensive. SO when I find, something I have no idea whether it's a bargain or a hopelessly optimistic price. EG Olympus macro lenses, 20mm and 38mm, earlier style with RMS thread only, both f3.5 I think - (the ...
by ChrisR
Mon Mar 16, 2009 2:46 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Leitz paperweight?
Replies: 40
Views: 14714

Thaks for the quick reply Rik. The lens is the one with the pretty rectangle in the link, 32/0.3 . http://img24.imageshack.us/img24/4296/uscopelens.jpg Its picture is on the left. The smaller knurled ring adjusts the iris , but not much. I was in my ignorance hoping to be able to alter the DOF, hey ...
by ChrisR
Sun Mar 15, 2009 3:56 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Leitz paperweight?
Replies: 40
Views: 14714

Leitz paperweight?

Hello all, absolute beginner here. Some of the images I've seen via this forum are heartstopping. We all have to die sometime, and it seems a wonderful way to go. I thought if I bought a microscope objective, I could take close-ups. I suspect you can tell where this is going already. :oops: I've don...