Search found 1309 matches

by enricosavazzi
Fri Apr 17, 2020 12:40 am
Forum: Equipment Discussions
Topic: Controlling Motorized rigs - Arduino or Raspberry Pi?
Replies: 11
Views: 3045

If you are considering a choice of Arduino or Raspberry Pi, I think the following are the most important criteria: Real-time control of stepper motor: The Arduino software runs directly on the hardware (only the built-in system timer is competing for CPU time and resources with your main thread), an...
by enricosavazzi
Thu Apr 16, 2020 7:50 am
Forum: Equipment Discussions
Topic: Bellows for Canon EOS
Replies: 18
Views: 3702

At present I am setting up my home office/photo lab in (hopefully) my permanent residence for several years to come, and this thread came at a time when I started to re-evaluate my options for equipment to keep or discard. For one thing, bellows in a lab setting are more efficient to reconfigure tha...
by enricosavazzi
Mon Apr 13, 2020 12:42 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: The Olympus MC-14 Teleconverter with the Olympus 60mm 2.8
Replies: 19
Views: 5937

Several months ago I got the Viltrox M3/4 extension tube set (10 mm and 16 mm) and a no-name set externally quite similar to the Kenko (all visible details are the same judging from pictures and videos of the Kenko tubes, but I don't have Kenko tubes for a direct comparison of measurements). In both...
by enricosavazzi
Sun Apr 12, 2020 6:11 am
Forum: Equipment Discussions
Topic: What are Zeiss Jena HI finite objectives?
Replies: 3
Views: 2147

What are Zeiss Jena HI finite objectives?

I need a refresher - What does "HI" mean in the engravings on Zeiss Jena finite objectives? I have for example a Zeiss Jena Apochromat HI 60x with adjustable NA from 0.7 to 1.0, in RMS mount.
by enricosavazzi
Mon Apr 06, 2020 6:53 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Advice please: High NA air objective with small WD
Replies: 15
Views: 4784

I have no specific knowledge to offer, but I have a Mitutoyo FS-60 microscope equipped with four Mitutoyo M Plan Apos, and I rarely use the built-in axial illumination because it gives a very flat and very low contrast "rabbit-in-the-headlights" rendering of almost all subjects. It is especially hop...
by enricosavazzi
Sat Apr 04, 2020 10:55 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Question on Trying to shoot a rock under water
Replies: 7
Views: 2823

A water aspirator connected to a running water faucet is probably the simplest and cheapest way to achieve a relatively good vacuum: https://en.wikipedia.org/wiki/Aspirator_(pump)
by enricosavazzi
Sat Apr 04, 2020 3:47 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Question on Trying to shoot a rock under water
Replies: 7
Views: 2823

With moderately porous rocks, the bubbles that emerge from the rock surface may be air being replaced by water drawn into the rock pores by capillarity. These bubbles can be largely eliminated by submerging the subject in water, then applying a vacuum (or a substantially reduced atmospheric pressure...
by enricosavazzi
Thu Feb 27, 2020 11:18 am
Forum: Equipment Discussions
Topic: High precision x, y and R object adjusting head
Replies: 1
Views: 775

In one of my junk boxes I happen to have two very similar or identical Mitutoyo micrometers, also in my case from the stage of an SEM. I don't remember the SEM brand, but not Mitutoyo, The micrometers only are Mitutoyo. I also have a third micrometer from the same stage, but it is smaller than the o...
by enricosavazzi
Wed Feb 12, 2020 1:22 pm
Forum: Nature Photography -- Macro and Close-up
Topic: Wasps, some in flight
Replies: 16
Views: 3193

Are those rice grains on the ground?
by enricosavazzi
Tue Feb 11, 2020 2:59 am
Forum: Equipment Discussions
Topic: Sony Alpha remote SDK
Replies: 0
Views: 772

Sony Alpha remote SDK

Sony has released a camera remote SDK for Alpha cameras. So far it only supports ILCE-7RM4 and ILCE-9M2, they say they will support more, but it is unclear whether they will support also legacy models or only present/future ones. Only Windows 8.1 and Windows 10 64-bit supported. Only USB to the came...
by enricosavazzi
Thu Feb 06, 2020 1:01 pm
Forum: Equipment Discussions
Topic: Gretag 120 Tube Lens Tested With Surprising Results
Replies: 19
Views: 3196

[...] I had come across some interesting adapters such as the one below on eBay but I could never work out if both ends with M52 threaded or only one end was. https://www.ebay.co.uk/itm/52mm-Lens-Adapter-Tube-for-Kodak-P850/401209832846 Difficult to say for sure, but this part is generally describe...
by enricosavazzi
Sun Jan 26, 2020 1:26 pm
Forum: General Discussion Forum and Community Announcements
Topic: Unusually priced accessory from a camera seller on eBay
Replies: 2
Views: 2641

Unusually priced accessory from a camera seller on eBay

From the inventory of a seller currently advertising a few fairly reasonably priced scanner lenses, the following item stands out in more than one way:

https://www.ebay.co.uk/itm/Razor/223865 ... SwqCJbzit-
by enricosavazzi
Sun Jan 26, 2020 11:55 am
Forum: Equipment Discussions
Topic: Laowa 65mm Macro Lens Announced
Replies: 5
Views: 1446

[...]The Laowa 60mm 2x for dslrs cover FX when being used as a macro lens.[...] It does cover full frame in the macro range, but at the expense of dark corners at all apertures, substantial transversal CA and major pincushion distortion. Pincushion distortion is still quite obvious on APS-C as well...
by enricosavazzi
Thu Jan 23, 2020 5:08 am
Forum: Equipment Discussions
Topic: How to open a Mitty?
Replies: 26
Views: 2150

So, there is no possibility to align anything.[...] One of the types of alignment that may be done is by rotating elements with respect to each other, while measuring the optical parameters to find the best reciprocal orientation. This type of alignment may be done at the factory before inserting t...
by enricosavazzi
Tue Jan 21, 2020 12:43 am
Forum: Equipment Discussions
Topic: Recommended Macro lenses and equipment for 35mm slide copies
Replies: 17
Views: 1498

[...] I can't find any tubes that thread into the front of the lens. People complain about ordering the extension tubes from China and not getting them for 8 weeks or more. Sounds ridiculous.[...] Unfortunately true, it usually takes 1-2 months. I googled 58 mm extension tubes and found some on Ama...