Search found 465 matches

by JohnyM
Tue Jan 15, 2019 6:35 am
Forum: Equipment Discussions
Topic: Which camera bodies have fully electronic shutter?
Replies: 39
Views: 11174

Sony (cameras im using):
-APS-C : A6300, A6500
-FF: A7 generation III and A7RII (afaik it's only gen II camera with electronic shutter)
by JohnyM
Mon Jan 14, 2019 1:13 am
Forum: Equipment Discussions
Topic: "Special objective" for centering epi illuminators
Replies: 6
Views: 2881

Nikon calls it "Lamp centering tool", dont know about olympus. It's plain and simple - a matte glass with some crosshairs / circles. Linked ebay item is inverted only due to not being angled - would be hard to spot anything on upright microscope... Second is exactly same, but with angled mirror for ...
by JohnyM
Fri Jan 04, 2019 10:09 pm
Forum: Equipment Discussions
Topic: Judging high-NA infinity-corrected objectives
Replies: 62
Views: 17404

No, inscribed magnification means only how it's performing on dedicated scope. In fact most manufacturers provide various focal lenghts of tube lenses. Ie: nikon have 100mm and mitutoyo have 400mm. It's very likely that 20x will outperform 40x, just because we'll use much smaller part of its image c...
by JohnyM
Fri Jan 04, 2019 8:23 pm
Forum: Equipment Discussions
Topic: Judging high-NA infinity-corrected objectives
Replies: 62
Views: 17404

With diffused only light, you can fill apertures up to 0.95
That means, it's not hard to dia light dry objectives with no optics. I myself use flat led panel with extra diffusion sheet for slide scanning.
by JohnyM
Fri Jan 04, 2019 7:34 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

Changing the angle will make the coverslip appear as different thickness to objective.
by JohnyM
Fri Jan 04, 2019 4:06 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

Yup, that's the item, and everything went as you described.
Sometimes page like Watchcount can help to nail real price, but sometimes it aint working properly.
by JohnyM
Fri Jan 04, 2019 2:30 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

I've paid (on previous "floods") ~130 USD for Nikon and 200 USD for Mitu. where could I find a Mitu 20X for 200$ :shock: Ebay. If you take your time, you can find good prices for anything. http://www.photomacrography.net/forum/userpix/3881_Untitled1_4.jpg Recently bought Mitu 10x for 150$, and Niko...
by JohnyM
Fri Jan 04, 2019 7:00 am
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

Is there a such thing? No 3 coverslips have such tollerance that allow for ~50% drop in max intensity for this objective. Also i dont fancy swapping coverslips for every objective. But i suspect it could be possible to "fix" this objective. It might be a matter of spacer, need to figure out how to o...
by JohnyM
Fri Jan 04, 2019 6:18 am
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

I have 1501-9398. When compared to Mitutoyo 20x/0.42, mitu is so much better in every aspect. Nikon does have huge image circle, but quality image circle barely fills APS-C sensor while mitu can be pushed down on even on FF. Mitu is better on uncovered subject, obviously. When they first appeared (N...
by JohnyM
Mon Dec 31, 2018 5:44 am
Forum: Equipment Discussions
Topic: Stacked lens configuration
Replies: 5
Views: 2633

Looks like diffraction blur to me. What aperture were you shooting at? Distance between lenses is arguable. If you use both lenses focused on infinity, theoretically you could place them infinitely apart. Here is calc that can help you estimate: https://www.edmundoptics.com/resources/tech-tools/infi...
by JohnyM
Sun Dec 30, 2018 6:36 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

None. 25mm CFI60
by JohnyM
Sun Dec 30, 2018 6:30 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

This means that objective will work with UW eyepieces with field diameter = 25
That is => 25mm / objective magnification = field of view
by JohnyM
Sun Dec 30, 2018 5:17 pm
Forum: Equipment Discussions
Topic: A glut of Mitutoyo 7.5x Plan Apo Objectives ?
Replies: 69
Views: 18248

W.D = 1.0
As inscribed on barell.
by JohnyM
Sat Dec 29, 2018 4:45 am
Forum: Equipment Discussions
Topic: Schneider 28mm f2.8 Componon Perf Stacked is Extremely Good
Replies: 32
Views: 5485

lothman wrote:thanks for sharing if I only could understand why adding another lens with numbers of additional lens can improve thing so much?
Suprizingly, like many others, Schneider enlarging lenses are optimized for infinity, despite being enlarging. Also effective aperture is improved quite a bit.
by JohnyM
Sun Dec 23, 2018 5:55 pm
Forum: Equipment Discussions
Topic: Leica lens experts - is this a "dipping" lens?
Replies: 14
Views: 2672

It is epi darkfield objective. D stands for "dunkelfeld" which is german for darkfield.