Search found 291 matches

by mtuell
Wed Feb 10, 2021 1:31 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Episcopic intro video
Replies: 2
Views: 1723

Episcopic intro video

Hi, all... it's been a long time. I put together an introductory video about episcopic techniques, so I figured I'd share it! It is 10 minutes long and uses a Nikon Epiphot TME. [url]https://lavinia.as.arizona.edu/~mtuell[/url]is my site, which maybe you've visited in the past. This video can be fou...
by mtuell
Sun Dec 16, 2018 12:03 am
Forum: Equipment Discussions
Topic: MM-11 schematic?
Replies: 1
Views: 2482

MM-11 schematic?

Hi, I picked up an MM-11 base, and the switch indicator comes on, but neither lamp output seems to work. First, the bottom light says that it is 20W, but the top light isn't marked... does anyone know if it is also 20W, or if it sports a 50W supply? Second, does anyone happen to have the schematics ...
by mtuell
Wed Dec 12, 2018 9:10 pm
Forum: Equipment Discussions
Topic: Nikon Diaphot TMD w/ DIC -- Help!
Replies: 25
Views: 11533

Kurt, Well, thanks for the info! I've actually got one of those 20 mm extenders that hold the slider. It came with a fluorescence scope. Now that is starting to make some sense! As for your questions - #1, I'm not sure - it may be that they are of the same vintage, but one was if you also wanted to ...
by mtuell
Mon Dec 10, 2018 8:11 pm
Forum: Equipment Discussions
Topic: Mirau objective?
Replies: 19
Views: 6549

Yes, the MI is a different beast. The DI is very useful for what it is intended for, but not so much outside of that. If you were making knives or razor blades or optical surfaces or semiconductor wafers - it gives a way to visualize the surface in (essentially) 3D, so you can know it is good or tha...
by mtuell
Mon Dec 10, 2018 1:19 pm
Forum: Equipment Discussions
Topic: Mirau objective?
Replies: 19
Views: 6549

Well, everything is reflective - the best AR coatings still aren't perfect. But, I think you mean highly reflective? No, it works fine on bare glass which is about 4% reflective. The contrast of the fringes will vary with the ratio of test beam to reference beam, so you will see changes in contrast ...
by mtuell
Sun Dec 09, 2018 10:08 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Tumbleweed flowers
Replies: 5
Views: 3091

Nice photo, Steve!

Yeah, Rik - those little yellow flowers tells you it's time to pull that bugger up, before they dry out!

Mike
by mtuell
Sun Dec 09, 2018 6:20 pm
Forum: Equipment Discussions
Topic: Mirau objective?
Replies: 19
Views: 6549

Hi, sorry, they've "upgraded" the server my site is on, and it is currently only sort of working... Anyway, in the video made by James, he is adjusting focus, which changes the path length between the specimen and the reference mirror in the objective. This goes from no fringes (out of the range of ...
by mtuell
Thu Nov 29, 2018 12:24 am
Forum: Photography Through the Microscope
Topic: microcontroller die in DIC
Replies: 2
Views: 1404

I think you are seeing the DIC rainbow...
by mtuell
Tue Nov 27, 2018 1:03 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Negative copier
Replies: 12
Views: 3986

You of course are correct, for most instances. It is empty resolution beyond maybe 3200 dpi, depending on a few factors (diffraction and aberrations, for sure). In theory, regular film does have about 300 line pairs/mm, which is ~15,000 dpi. While I haven't tried it yet, for high contrast, low iso i...
by mtuell
Mon Nov 26, 2018 10:36 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Negative copier
Replies: 12
Views: 3986

Funny you should bring this up. I just got an Epson Perfection V850 Pro - that thing is beautiful! I'm actually scanning some 35 mm color negatives as I type. I mostly got it because it can do large format negatives (and positives), since I've started playing around with 4x5 (inch), but my enlarger ...
by mtuell
Mon Nov 26, 2018 10:14 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Porophyllum gracile
Replies: 9
Views: 3738

Beautiful work, Steve! You ought to check your back gate more often! :D

Mike
by mtuell
Thu Nov 22, 2018 11:53 am
Forum: Photography Through the Microscope
Topic: microcontroller die in DIC
Replies: 2
Views: 1404

microcontroller die in DIC

Nikon Optiphot / Nikon D810 at full resolution, then 25% sized and cropped - single images with 1 second exposures 5x M Plan (iso 80) http://www.photomacrography.net/forum/userpix/5650_5x_DIC_microcontroller_1_crop2_1.jpg 100x M Plan (iso 125) http://www.photomacrography.net/forum/userpix/5650_100x_...
by mtuell
Sun Nov 11, 2018 10:16 pm
Forum: Photography Through the Microscope
Topic: Madagascar Sunset Moth 40x DF
Replies: 3
Views: 1808

Ah, yes... both darkfield with BD DIC 40x objectives. The camera, believe it or not, is a cheap-o USB camera from OMAX, although it is the 14 MP version. Presented here is at 25% of the original size, pushed through Photoshop for levels and unsharp masking. I just got a c-mount adapter so I can put ...
by mtuell
Tue Oct 30, 2018 11:52 am
Forum: Photography Through the Microscope
Topic: Madagascar Sunset Moth 40x DF
Replies: 3
Views: 1808

Madagascar Sunset Moth 40x DF

I just picked up an Epiphot - what a nice instrument! :shock:

Image

Image

Mike
by mtuell
Sat Oct 06, 2018 1:35 am
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Madagascar sunset moth
Replies: 0
Views: 1444

Madagascar sunset moth

Steve was nice enough to give one of his sunset moths to me - here is a stack (Zerene DMap) of 63 frames at ISO 400, 1/200th of a second full-frame Nikon D810 with a Zeiss Triotar 135 mm prime as a tube lens and a reversed Pentax 67 200 mm f/4 (wide open = NA 0.125) as the objective, for an on-senso...