Search found 2803 matches

by ray_parkhurst
Wed Jan 20, 2021 7:23 pm
Forum: Equipment Discussions
Topic: New Lumix G9 vs used Canon 5DsR - what is better for extreme macro?
Replies: 5
Views: 214

Re: New Lumix G9 vs used Canon 5DsR - what is better for extreme macro?

Hi all! Please, I need your argumented opinions on what camera to choose. Which camera body would you prefer for studio extreme macro work for the same money : - Canon 5DsR , used (say 10000-40000 shots) or - Panasonic Lumix DC G9 , new ? They give pretty similar real resolution if use pixelshift o...
by ray_parkhurst
Mon Jan 18, 2021 6:53 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: 8000ED Image Circle
Replies: 2
Views: 157

Re: 8000ED Image Circle

The system settings for the 8000ED and 105PN are very close so I went ahead and shot the 105PN at 1:1. I will only show the 200% detail shots on a small divot on Lincoln's cheek. I went out to 90mm to see how far it would go. 60mm still looks good, with a little degradation at 70mm, consistent with ...
by ray_parkhurst
Mon Jan 18, 2021 2:30 pm
Forum: Macro and Micro Technique and Technical Discussions
Topic: 8000ED Image Circle
Replies: 2
Views: 157

8000ED Image Circle

I've been working on the Sensor-Pan system, and have added a simple X-stage to allow me to move the subject so as to keep it centered on the sensor. This has a similar effect as using a wafer target with near exact copies at regular intervals, but I can use my preferred subjects and can move arbitra...
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: 300

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: 300

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: 300

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: 300

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: 820

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: 522

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: 820

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: 475

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: 475

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: 522

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: 522

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: 522

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...