Search found 2864 matches

by Chris S.
Mon Apr 06, 2020 5:06 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Advice please: High NA air objective with small WD
Replies: 9
Views: 2818

Advice please: High NA air objective with small WD

Seeking advice, please. I've been offered an apo, high NA, air objective designed for no cover slip, that has a tiny working distance of 1.3mm. This objective has a wide front end that will make it nearly impossible to shine reflected light onto the subject. So in my view, subjects for this lens mus...
by Chris S.
Thu Apr 02, 2020 1:53 am
Forum: Beginners Micro
Topic: Approach to building a system
Replies: 2
Views: 1776

Re: Approach to building a system

1)Does it make sense to start by purchasing the objective first (even if I cannot test)? If this were a Mitutoyo objective, I'd say that it's never safe to purchase second hand without a test and return privilege. However, these Nikon objectives seem to be made of sterner stuff--I don't think they ...
by Chris S.
Mon Mar 30, 2020 12:09 am
Forum: Equipment Discussions
Topic: Good 10x objective: Nikon M Plan 10x/0.25 or Oly Plan 10x
Replies: 8
Views: 1714

Antonio, I have no knowledge about the Olympus objective, but the Nikon M Plan 10/0.25 finite 210/0 is a "known good" lens for macro work. For about twice the price, I see a nice-looking Nikon N Plan 10/0.30 160/0.17 listed on eBay; these are quite good, and to my mind worth the extra money. Avoid t...
by Chris S.
Thu Mar 26, 2020 10:37 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Zerene Stacker now has dust & hot-pixel removal
Replies: 52
Views: 10668

Rik, Delightful to see this added to Zerene Stacker! I've downloaded the beta, and am looking forward to trying out dust and hot-pixel removal. I am aware that Canon has a dust delete feature in many of its cameras. You take an out of focus image, at a large aperture, of something fairly bright, suc...
by Chris S.
Mon Mar 23, 2020 11:40 pm
Forum: Technical and Studio Photography -- Macro and Close-up
Topic: Papilio ulysses
Replies: 37
Views: 5175

Re: Papilio ulysses

. . .do you have a histogram photo from a single shot? I'm interested cause your images are so nice bright do you shoot expose to the right? My experience with my 50x objective is that must under expose a lot cause my highlight blowing out. Marco, Like you, I leave extra space at the right side of ...
by Chris S.
Tue Mar 17, 2020 12:26 am
Forum: Equipment Discussions
Topic: Vibration Test
Replies: 8
Views: 1120

Jin, I don't know a single accurate and simple test. Perhaps someone else does. I can suggest a number of tests that I would use together. Are you going to light your images with flash or continuous light? Of course, continuous light is much less tolerant of vibration. One test here would be to shoo...
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: 2119

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: 1746

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: 875

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: 1746

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: 983

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: 1746

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: 1746

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: 6209

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: 1454

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...