Search found 193 matches

by kaleun96
Tue Jan 28, 2020 2:36 am
Forum: Equipment Discussions
Topic: Fast LED Strobe for Macro
Replies: 45
Views: 5563

Hey Mike, I just got into PCB manufacturing myself and have a question about the small holes in the ground plane. I can't work out their purpose. They don't look like vias, I wouldn't think they're required for thermal regulation, I assume they're not helping to reduce impedance or interference with...
by kaleun96
Thu Jan 23, 2020 8:49 am
Forum: Equipment Discussions
Topic: Raynox 5320
Replies: 35
Views: 6255

On this topic, I found the recent video from Applied Science quite interesting:
https://www.youtube.com/watch?v=Xr1AiExSAnU

He mentions that the reflectance of store-bought black velvet was about 0.5% if I remember correctly.
by kaleun96
Wed Jan 22, 2020 8:54 am
Forum: Equipment Discussions
Topic: My experience buying used Mitutoyo 100X 0.70:
Replies: 50
Views: 4485

Thanks for the help Mike and Rik. Perhaps I will try this when I've got my rig back up and running.

Not that I have an issue with low torque (AFAIK) but it'd be interesting to try.
by kaleun96
Wed Jan 22, 2020 8:08 am
Forum: Equipment Discussions
Topic: My experience buying used Mitutoyo 100X 0.70:
Replies: 50
Views: 4485

At risk of derailing this thread any further - how can you force a stepper into its cog position, or in the case of microstepping, force it to stop at a 1/4 step or 1/2 step position while running at 1/8, 1/16, etc microsteps? Cam, The stepper "cog" position is the natural unpowered rotor position,...
by kaleun96
Wed Jan 22, 2020 7:46 am
Forum: Equipment Discussions
Topic: My experience buying used Mitutoyo 100X 0.70:
Replies: 50
Views: 4485

At risk of derailing this thread any further - how can you force a stepper into its cog position, or in the case of microstepping, force it to stop at a 1/4 step or 1/2 step position while running at 1/8, 1/16, etc microsteps?
by kaleun96
Mon Jan 20, 2020 12:34 am
Forum: Equipment Discussions
Topic: My experience buying used Mitutoyo 100X 0.70:
Replies: 50
Views: 4485

Someone could run tests and plot the rotor angle deflection vs. external load torque at different micro-step rotor positions. I don't think this is exactly what you're after but might help: https://hackaday.com/2016/08/29/how-accurate-is-microstepping-really/ I'm ill-equipped to contribute meaningf...
by kaleun96
Sat Jan 18, 2020 12:07 pm
Forum: Equipment Discussions
Topic: My experience buying used Mitutoyo 100X 0.70:
Replies: 50
Views: 4485

I've always attempted to have step positions that are integer increments of the motor full step for this very reason. Hey Mike, do you mean that you still run the stepper in microstep mode but try to ensure that you always move in full-step increments? Can this also work if you're microstepping at ...
by kaleun96
Sun Jan 05, 2020 8:19 am
Forum: Equipment Discussions
Topic: CANON EOS M6 Mark II
Replies: 109
Views: 11631

Hi Kaleun96, I use TMC5130A via SPI. STEP/DIR wouldn’t make any sense. So, I have to calculate/determine the target-position and send it to the driver. In my case the speed of the processor doesn’t play any role. I’m afraid the speed of the step-motor is the bottle neck :-( You only can improve the...
by kaleun96
Sun Jan 05, 2020 6:47 am
Forum: Equipment Discussions
Topic: CANON EOS M6 Mark II
Replies: 109
Views: 11631

Could you tell me how long takes to run a certain distance quietly with your setup? I'm using the TMC2130 myself (though I should maybe upgrade to the TMC2209 eventually) and can complete about 140mm of travel (35mm to the back, change direction and 70mm to the front, change direction and 35mm to t...
by kaleun96
Tue Dec 31, 2019 6:46 am
Forum: Equipment Discussions
Topic: High-End 1X Lens Test Online
Replies: 24
Views: 2023

Thanks for the test Robert! Shame about the Sony 90mm, wonder if it was just that particular sample or all are that bad. I have the Laowa 100mm 2x f2.8 so would have been cool to see that but can understand it may still be hard to borrow at this stage. I wouldn't expect anything spectacular from it,...
by kaleun96
Fri Dec 20, 2019 4:02 pm
Forum: Equipment Discussions
Topic: Polaroid SprintScan 4000 vs Scanner-Nikkor ED Shootout
Replies: 8
Views: 660

Nice results, thanks for posting. I had been tempted to get one of those Polaroid SprintScan's since I tried a lens from the Polaroid Pro Palette 7000. That one was labelled as a 43.53mm F/6.6 and had a different body to your lens but optically could be similar.
by kaleun96
Thu Dec 19, 2019 3:18 am
Forum: Equipment Discussions
Topic: Comparing macro lenses using MTF - invitation, take 2
Replies: 26
Views: 3695

Nice to see the Xenoplan 23/1.4 (4.0) performing nicely here. Just to confirm, you used the fixed aperture version with its aperture unmodified, right? I was/am intending to drill out the fixed f/4.0 aperture to its optimal aperture for this use. When I tested this some time ago f/2.8 and f/4.0 vie...
by kaleun96
Sat Dec 14, 2019 6:19 am
Forum: Equipment Discussions
Topic: Invaritar lenses
Replies: 10
Views: 1008

I too found it difficult to find any info about most of the lenses on eBay. The ones I could find info for (and had a listing on eBay) were almost always meant for 1/4" to 3/4" sensors.
by kaleun96
Sun Dec 08, 2019 9:04 am
Forum: Macro and Micro Technique and Technical Discussions
Topic: Some early tests of a Macro Fisheye setup
Replies: 1
Views: 1331

Some early tests of a Macro Fisheye setup

I picked up a Fujinon 2.7mm f1.8 fisheye lens and thought I'd try some macro fisheye John Hallmén style. Surprisingly I get good coverage on my full-frame A7R3 sensor, though with some slight vignetting. The setup that has provided the best quality in-conjunction with a magnification I'm happy with ...
by kaleun96
Wed Dec 04, 2019 2:48 pm
Forum: Equipment Discussions
Topic: Genaray Pocket LED for studio setups
Replies: 2
Views: 657

Looks like there are a lot of LED panels boasting similar ratings on BH Photo . Might be common for these companies to stretch the truth of those claims or it's become a lot cheaper to achieve those ratings. Guess either way the CRI rating here doesn't seem to elevate it above some similarly priced ...