Search found 2888 matches

by Chris S.
Sat Mar 14, 2020 3:02 am
Forum: Equipment Exchange
Topic: Wanted NIKON M Plan, 40/0.5 ELWD, 210/0 or 60/0.7
Replies: 4
Views: 2378

Re: Wanted NIKON M Plan, 40/0.5 ELWD, 210/0 or 60/0.7

Antonio, I have four specimens of the Nikon M Plan 40x/0.5 ELWD finite objective that you ask about, and I only need one. One specimen has been spoken for by another form member before you asked, but I have the three others. I also have a specimen of the Nikon M Plan 60x/0.70 ELWD that I don't need,...
by Chris S.
Tue Mar 03, 2020 1:00 am
Forum: Equipment Discussions
Topic: Rodenstock Rodagon 150mm f/5.6 rear diamater?
Replies: 20
Views: 1927

I will never buy another used Mitutoyo objective, only new. When I bought my set of Mitutoyo objectives (none new), I must have been very lucky. I returned only one, which looked as if it had been shot blasted. All the others were great, which I can say with confidence as each has been tested again...
by Chris S.
Mon Mar 02, 2020 1:52 am
Forum: Equipment Discussions
Topic: Saving a Schneider Componon From the Trash Bin
Replies: 6
Views: 955

Great job, Robert! Last time I tried to reassemble an iris, I quickly gave up and tossed the components in the trash. (The assembly was going into the trash anyway--I just wanted to take a stab at reassembling an iris--a very brief stab, as it happened. The assembly you fixed does look a bit more ro...
by Chris S.
Mon Mar 02, 2020 1:43 am
Forum: Equipment Discussions
Topic: Rodenstock Rodagon 150mm f/5.6 rear diamater?
Replies: 20
Views: 1927

Robert, thanks a bunch! Sorry this test was so much trouble. I layered your images in Photoshop, and flashing between, I think I do see degradation increasing step-wise with each move away from infinity focus. Granted, there are confounding details--single shots vs stacks, and subject bumping as you...
by Chris S.
Sun Mar 01, 2020 6:29 pm
Forum: Equipment Discussions
Topic: Bizarre Nikon Optiphot photo tube attachment ID request
Replies: 12
Views: 1119

mbb wrote:. . . could you please remove double in the second post - this I still need to learn
I went ahead and removed the duplicate image.

Mark, welcome! :D

--Chris S.
by Chris S.
Sun Mar 01, 2020 1:05 am
Forum: Equipment Discussions
Topic: Rodenstock Rodagon 150mm f/5.6 rear diamater?
Replies: 20
Views: 1927

When you pull down a lens with short focus you can pull some lenses down quite a bit but all will eventually suffer IQ loss in the corners. I think this might happen sooner than later with a high-NA lens. Robert, I was thinking more about spherical aberration and perhaps other issues. There was a p...
by Chris S.
Sat Feb 29, 2020 10:51 pm
Forum: Equipment Discussions
Topic: Rodenstock Rodagon 150mm f/5.6 rear diamater?
Replies: 20
Views: 1927

Robert,

Regarding short focus of a converging lens, I keep wondering if it will have a detrimental effect with a high-NA objective. We have theory that it might be problematic, but I don't recall seeing any tests.

You have a Mitututoyo 100x/0.70, don't you? :D

--Chris S.
by Chris S.
Wed Feb 26, 2020 3:03 am
Forum: General Discussion Forum and Community Announcements
Topic: Out of Macrophotography for the Time Being
Replies: 31
Views: 8218

Re: Out of Macrophotography for the Time Being

At least nobody got killed or seriously hurt. . . . This. Let us rejoice in this . Nobody got hurt or killed in the inferno. Being deprived of your home and its contents must be very hard, and I sympathize. And your macro stuff is currently unreachable, with which I also sympathize. But I'm glad th...
by Chris S.
Tue Feb 25, 2020 3:39 am
Forum: Equipment Exchange
Topic: Nikon CF N plan10x 0.30 160/0.17
Replies: 2
Views: 1583

Am writing to add a second opinion that this model of objective is excellent. For a time, it was the best 10x objective known by members of this forum, producing many wonderful results. This lens' current results remain as good as ever--all that has changed is that now we have other options. The Nik...
by Chris S.
Wed Feb 19, 2020 12:26 am
Forum: Equipment Discussions
Topic: Fast LED Strobe for Macro
Replies: 45
Views: 5833

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: 2129

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: 2129

. . . 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: 2129

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: 1203

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: 3826

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...