Search found 1307 matches

by enricosavazzi
Tue May 19, 2020 7:34 am
Forum: Equipment Discussions
Topic: Comparing macro lenses using MTF - invitation, take 2
Replies: 26
Views: 4407

I have that Kodak scanner lens, it was sold for a very few dollars (maybe $10) by Surplus Shed. It would be the winner in any weight per dollar lens contest. If I recall correctly (and I may not be recalling correctly), it had lots of longitudinal CA in my tests, but maybe there is some range of m ...
by enricosavazzi
Sun May 17, 2020 2:53 am
Forum: Equipment Discussions
Topic: A peek inside the THK KR20
Replies: 6
Views: 1083

A peek inside the THK KR20

The THK KR20 linear actuator is not news to many of us. However, it may be interesting to peek inside and see a little of how it is built, especially since disassembling your KR20 just to see what is inside is "not recommended" (for good reasons). http://savazzi.net/photography/THK_KR20_inear_actuat...
by enricosavazzi
Mon May 11, 2020 12:41 am
Forum: General Discussion Forum and Community Announcements
Topic: On Lockdown
Replies: 252
Views: 30934

RP>> I said nothing about herd immunity. Checking the record , your exact words were "The downturns in the data are not due to whether a country went into lockdown, but due to the virus starting to run out of hosts to infect " (emphasis added). So I am puzzled. How is "run out of hosts" different f...
by enricosavazzi
Thu Apr 30, 2020 8:02 am
Forum: Equipment Discussions
Topic: Lens scope converter?
Replies: 4
Views: 1578

Just to make sure we are talking of the same thing, the "Nikon Lens Scope Converter" is an accessory that attaches at the rear of a Nikon lens with F bayonet and converts it to a telescope. It has an eyepiece at the rear and a built-in prism to erect the image. I had one in the past but sold it afte...
by enricosavazzi
Tue Apr 28, 2020 4:53 am
Forum: Equipment Exchange
Topic: WTB : Mitutoyo Mplan Apo X20 .42
Replies: 9
Views: 2223

I bought a Nikon ELWD 20x ,working distance: 19mm, it's great, as good as mitutoyo20x My Nikon finite MPlan ELWD 20x/0.40 has 10.1mm working distance. Wonder why the almost 9 mm difference between our lenses' WD? Could yours be the SLWD? Another possibility is that it is an ELWD, but used with a tu...
by enricosavazzi
Tue Apr 28, 2020 12:46 am
Forum: Equipment Discussions
Topic: Mitakon Super Macro 1x-5x (generation II)
Replies: 5
Views: 2740

For anyone that wants to pixel peep, here is a link to OneDrive that has a sampling of 13 pictures. https://1drv.ms/f/s!AvUX6lOYSxvraU-FAhs_h5dlX-E Appears that OneDrive lets you zoom in to about 140% Let me know if this works OK, or if you have issues using this method. Thanks, G Thank you for the...
by enricosavazzi
Sun Apr 26, 2020 8:14 am
Forum: Equipment Discussions
Topic: Stonemaster Stackmaster
Replies: 10
Views: 2661

Re: Stonemaster Stackmaster

lonepal wrote:It is strange.

How can they sell it without a global web site?
It could indicate that they are not interested in selling globally. Maybe the German market is enough for them.
by enricosavazzi
Sun Apr 26, 2020 2:36 am
Forum: Equipment Discussions
Topic: Stonemaster Stackmaster
Replies: 10
Views: 2661

Re: Stonemaster Stackmaster

Did a search and only found only one mention here to the Stackmaster rig (from 2017). Has anyone used this system and if so, any comments or critiques? I know nothing about it, but as a reference the Stackmaster is made/marketed by a company called Stonemaster, which also advertises lapidary equipm...
by enricosavazzi
Sat Apr 25, 2020 10:54 pm
Forum: Equipment Discussions
Topic: 40x LWD
Replies: 6
Views: 1951

[...] There are a few 40 LWD and ELWD from Nikon with 210 mm tube length and without cover glass. Some have > 2 mm free working distance. That would require a 50 mm intermediate tube being added to your microscope. [...] The MPLAN ELWD 40x 0.50 in particular has slightly more than 10 mm working dis...
by enricosavazzi
Sun Apr 19, 2020 12:03 pm
Forum: Equipment Discussions
Topic: What are Zeiss Jena HI finite objectives?
Replies: 3
Views: 2107

Thanks for the information. Given the relatively low NA, I was actually hoping for a water or glycerol immersion objective, as a speedier and less messy alternative to oil immersion. I have a Lomo 70x water immersion objective that I might try to use instead.
by enricosavazzi
Sat Apr 18, 2020 8:31 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Polyvar condenser problem.I need advise.
Replies: 5
Views: 2735

Re: Polyvar condenser problem.I need advise.

[...]This is true with small Standards stands but with the WL I can raise both the stage holder and condenser holder in the focus block to work with short barrel objectives. Sharing these components with the WL, I think that Universal and Photomic would be able to do the same I got rid of my Photom...
by enricosavazzi
Sat Apr 18, 2020 12:26 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Polyvar condenser problem.I need advise.
Replies: 5
Views: 2735

Re: Polyvar condenser problem.I need advise.

Hi I have a biological microscope Reichert Polyvar with a universal condenser BF, DF, PH, DIC. The problem is that I can't adjust the lighting according to Kohler. I proceed in this way: I leave the condenser down, close the field iris diaphragm, then raise the condenser up and when I see that ther...
by enricosavazzi
Fri Apr 17, 2020 1:04 am
Forum: Equipment Discussions
Topic: Bellows for Canon EOS
Replies: 18
Views: 3616

[...] The Ihagee bellows seems to work very much like my large Pentacon M42 bellows, see e.g. https://www.photomacrography.net/forum/viewtopic.php?p=37898 [...] Are there any specific reason you prefer the Ihagee-branded version? The M42-threaded bellows must be a lot easier to adapt. By the way, i...
by enricosavazzi
Fri Apr 17, 2020 12:40 am
Forum: Equipment Discussions
Topic: Controlling Motorized rigs - Arduino or Raspberry Pi?
Replies: 11
Views: 2860

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: 3616

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...