Search found 2864 matches

by Chris S.
Wed Feb 19, 2020 12:26 am
Forum: Equipment Discussions
Topic: Fast LED Strobe for Macro
Replies: 45
Views: 5573

Mike, This question is moot now, but I've been wondering: Do you think latency would be a significant issue in using LED COBs for motion-stopping flash--say 1/20,000 second or faster? (By "latency"--not sure this term is exactly right, here--I mean, "Would it take overmuch time for the LED array to ...
by Chris S.
Mon Feb 17, 2020 2:42 am
Forum: Equipment Discussions
Topic: Olympus LM PLAN FI 20x/0.40 BD infnity corrected
Replies: 15
Views: 1991

Hello Chris S., about this you said : ..there will be an outer ring that must be blocked to prevent light from leaking onto your sensor... what does it mean "blocked"? I must insert dark material to prevent light? Antonio, Congratulations on acquiring what looks like a very nice lens at a favorable...
by Chris S.
Fri Feb 14, 2020 2:43 pm
Forum: Equipment Discussions
Topic: Olympus LM PLAN FI 20x/0.40 BD infnity corrected
Replies: 15
Views: 1991

. . . need no additional CA correction in the tube lens. You just have to find a suitable tube lens. Excellent! Antonio, you already have a suitable tube lens, as I know you have an assembly based around the Raynox DCR 150, which we now know will work fine with this objective. Just be aware that th...
by Chris S.
Fri Feb 14, 2020 9:00 am
Forum: Equipment Discussions
Topic: Olympus LM PLAN FI 20x/0.40 BD infnity corrected
Replies: 15
Views: 1991

From off-line communication, I understand that Antonio wants to know if this objective is suitable for use on a macro rig. For example, does it require CA compensating optics? What is its working distance?

--Chris S.
by Chris S.
Thu Feb 13, 2020 4:03 am
Forum: Equipment Discussions
Topic: First photo at 10X - optical quality advice
Replies: 8
Views: 1116

Antonio, First question: Are you certain that you made this stack with a 10x/0.40 objective? I'm guessing you meant to type "10x/0.25". This difference is important; the number after the front-slash ("/") indicates the numerical aperture (NA) of the lens, which indicates resolution in a well-designe...
by Chris S.
Wed Feb 12, 2020 5:10 am
Forum: Beginners Micro
Topic: 20x microscope objective on a budget
Replies: 3
Views: 3342

I'm an experienced macrophotography user (from close up to 5X ) and now i discovered the magic world of photos at >10X magnification :) I know you are an experienced macro photographer, Antonio. I only meant to describe you as inexperienced at magnifications higher than 5x--and this only to help ot...
by Chris S.
Wed Feb 12, 2020 2:04 am
Forum: Equipment Discussions
Topic: Nikon Plan Fluor 20x/0.50 DIC M
Replies: 4
Views: 969

Antonio's goals and budget are spread across three threads, as we neglected to help him when he first posted under "Beginner's Micro." I've tried to respond to all three threads in the original "beginners" location. May I suggest we continue any discussion there ? (And yes, that thread should get mo...
by Chris S.
Wed Feb 12, 2020 1:52 am
Forum: Beginners Micro
Topic: 20x microscope objective on a budget
Replies: 3
Views: 3342

Antonio, welcome to the forum! I see we didn’t do a good job in answering your question here, so that you’ve tried getting similar information in other threads. Let me try to consolidate your questions here in your original thread. Hello, I'm beginner in microphotography. Let me mention that inside ...
by Chris S.
Sun Feb 09, 2020 4:26 am
Forum: Equipment Discussions
Topic: Flash(es) recommendation
Replies: 63
Views: 5917

I also have my setup in the basement, mounted on a solid brick table with a marble slab on top of it. The setup itself is placed on another marble base isolated from the main table with anti-vibration pads. I worked on improving vibration issues and I pretty much solved that. But it is worthless if...
by Chris S.
Sun Feb 09, 2020 2:37 am
Forum: Equipment Discussions
Topic: Flash(es) recommendation
Replies: 63
Views: 5917

. . . though the biggest issue I found while playing high-M is not vibrations, but subject movement. Yeah, that's weird. I have a pretty solidly built setup, rig is placed over a brick table with a marble slab on top. There is another marble base between the equipment and the table, with anti-vibra...
by Chris S.
Sat Feb 08, 2020 12:18 am
Forum: Equipment Discussions
Topic: Need Advice re. Tearing Down X Axis Stage
Replies: 3
Views: 784

John, I once took apart my Newport model 462 linear stage, cleaned it, and reassembled it without much difficulty. I was a bit concerned about losing the bearings, but it turned out that they were captive. No idea whether or not your Kohzu resembles my Newport. I'd suggest working in a way that if t...
by Chris S.
Tue Feb 04, 2020 11:01 pm
Forum: Equipment Discussions
Topic: CAD Modelling Goniometers! and a Machinist Inquiry
Replies: 7
Views: 787

I've just now PM'd John with Don Wilson's email.

--Chris S.
by Chris S.
Sun Feb 02, 2020 11:47 am
Forum: Equipment Discussions
Topic: Using 10x objective with Sony A7rii full frame
Replies: 18
Views: 3002

I've PM'd Alison, offering to test a used Mitutoyo objective for her if she wishes.

--Chris S.
by Chris S.
Sun Feb 02, 2020 1:42 am
Forum: Equipment Discussions
Topic: CAD Modelling Goniometers! and a Machinist Inquiry
Replies: 7
Views: 787

Re: CAD Modelling Goniometers! and a Machinist Inquiry

JohnDownie wrote:Do you have his email by chance?
I don't have his email. Just now, though I emailed a mutual contact to see if I can get the email that way.

If I don't get it soon, I'd suggest you just give Don a call.

--Chris S.
by Chris S.
Sat Feb 01, 2020 11:25 pm
Forum: Equipment Discussions
Topic: CAD Modelling Goniometers! and a Machinist Inquiry
Replies: 7
Views: 787

Re: CAD Modelling Goniometers! and a Machinist Inquiry

I am going to marry the bottom goniometer, 40mm metric bolt pattern, to an Imperial rotary stage, so I am going to design an adapter plate to have made. Any suggestions as to machinist who could do the work for a somewhat reasonable cost, either in the US or Canada? John, My fabricator, Don Wilson,...