Search found 2800 matches

by ray_parkhurst
Sat Jan 09, 2021 8:56 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 224

Re: Sensor-Pan system

Thanks Lou, great input. I decided to test the usefulness of the system for lens image circle measurement. My first couple of tests of some microscope objectives showed disappointing results, so I mounted the 85mm Macro-Varon to see if there was an issue with the system. I was able to go out to a 90...
by ray_parkhurst
Sat Jan 09, 2021 9:18 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 224

Re: Sensor-Pan system

Thanks. An interesting approach. So the focus is done by varying the extension between lens and camera. Is telecentricity a limiting factor for lens choice here or are your subjects so flat that that doesn't become an issue? Telecentricity is always an issue with stacking, but the 95PN is for sure ...
by ray_parkhurst
Sat Jan 09, 2021 8:39 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 224

Re: Sensor-Pan system

Very interesting. Do you have a description of the Sensor Pan system you used for this? Some sort of automated XY system to move the camera through the large image circle of the lens, I presume? Do you connect the lens and camera with a bellows or another system that allows the necessary movement? ...
by ray_parkhurst
Fri Jan 08, 2021 6:20 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: Sensor-Pan system
Replies: 6
Views: 224

Sensor-Pan system

For well over a year I've been contemplating building a Sensor-Pan system for use with the Rayfact 3.5x (RF3p5x) lens. Integral with this system concept is a FF camera to minimize the number of tiles required to shoot a Lincoln Cent. The diameter of a US Cent is 19mm, and at 3.5x this projects a 66....
by ray_parkhurst
Sat Jan 02, 2021 5:27 pm
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 24
Views: 610

Re: New 1.4x Lens Test Results Online

Great test Robert! Interesting to see the M5400 NOT winning, but also surprising to not see the SN8000 lens in the test...Ray The Minolta 5400 is just slightly out of the best range at 1.4x, it's super in the 1.5 - 2x range. This test just happened to hit the best range for the Nikon. The 100mm Sca...
by ray_parkhurst
Sat Jan 02, 2021 7:49 am
Forum: Equipment Discussions
Topic: JML Optical 100mm f2 bellows lens
Replies: 5
Views: 421

Re: JML Optical 100mm f2 bellows lens

There is a good thread over on MFLenses re this lens. User found lens very soft and high CA. Seems it is indeed optimized for non-vis.
by ray_parkhurst
Sat Jan 02, 2021 7:24 am
Forum: Equipment Discussions
Topic: New 1.4x Lens Test Results Online
Replies: 24
Views: 610

Re: New 1.4x Lens Test Results Online

Great test Robert! Interesting to see the M5400 NOT winning, but also surprising to not see the SN8000 lens in the test...Ray
by ray_parkhurst
Fri Jan 01, 2021 8:02 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: My MacroScope Project
Replies: 4
Views: 389

Re: My MacroScope Project

Pau wrote:
Fri Jan 01, 2021 2:15 am
Ray,
I would be very interested in seeing your modifications of the Pentax Auto Bellows (I also use and love it), could you post them? (better in a new thread, I think)
PM Sent
by ray_parkhurst
Thu Dec 31, 2020 10:23 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: My MacroScope Project
Replies: 4
Views: 389

Re: My MacroScope Project

Very nice @LewTwo! This is similar to the systems I used to build. Mine used B&L "A" Stands, and I incorporated Pentax, Viviitar, and Novoflex bellows. The Pentax are the most flexible and wide range, though the Novoflex quality is very nice, and the Vivitar have shortest minimum extension. Still, t...
by ray_parkhurst
Mon Dec 28, 2020 5:13 pm
Forum: Equipment Discussions
Topic: JML Optical 100mm f2 bellows lens
Replies: 5
Views: 421

Re: JML Optical 100mm f2 bellows lens

Lens looks interesting Ray. Looks suspiciously like relay or X-Ray type lens though. Quick note FYI, I have had good and bad results with that seller, NatCam Exchange. The last time, in Nov. they sent a lens marked "EX" and it was barely "AVG" quality in reality with a nick in the center of the rea...
by ray_parkhurst
Sun Dec 27, 2020 5:59 am
Forum: Equipment Discussions
Topic: JML Optical 100mm f2 bellows lens
Replies: 5
Views: 421

Re: JML Optical 100mm f2 bellows lens

I was hoping someone on the forum had purchased one of these so we could get some info on performance, but alas it seems they went to others. It does look interesting. Something else to watch for I guess.
by ray_parkhurst
Thu Dec 24, 2020 8:05 pm
Forum: Equipment Discussions
Topic: JML Optical 100mm f2 bellows lens
Replies: 5
Views: 421

JML Optical 100mm f2 bellows lens

I see that several of these sold over last couple months. Did anyone on the forum buy one? I'm curious about performance given its large aperture. edited to add: same question about the 56mm f1.9 lenses further edit: here is a link to the last one that sold: https://www.ebay.com/itm/Nikon-JML-Optica...
by ray_parkhurst
Wed Dec 23, 2020 8:08 pm
Forum: Equipment Discussions
Topic: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested
Replies: 49
Views: 1511

Re: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested

I will measure it later this evening, Ray. The lens is quite good at 2.5-4 but I do not want to claim that it is as good as the special lenses you use. But unlike your subjects, mine wilt, so speed and flexibility are more important to me than to you. Also my subjects vary continuously in size, unl...
by ray_parkhurst
Wed Dec 23, 2020 7:10 pm
Forum: Equipment Discussions
Topic: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested
Replies: 49
Views: 1511

Re: Scanner Nikkor 38mm f/2.8 LS30 Scanner Lens Tested

On my A7r4 the Laowa 100mm and the 2,5-5x replaced all the scanner lens and special lenses, much easier to handle and having an aperture to be closed if necessary. For me too, the Laowa 2.5x-5x is usually the lens I turn to for ordinary FF work, especially for deep subjects or live subjects. I real...
by ray_parkhurst
Sun Dec 20, 2020 7:21 pm
Forum: General Discussion Forum and Community Announcements
Topic: Electronics Swap canceled for 2020
Replies: 6
Views: 2027

Re: Electronics Swap canceled for 2020

Well, the shutdown order of 6-Dec made very little actual change to the Bay Area. When it was announced there was a huge flurry of activity, with the freeways packed like it was a Friday commute rush hour. Next day it was a ghost town again, slower than before the new order, yet within a couple days...