Wonder if they have a type of structure where the light transmission varies with intensity, like the sunglasses that get dark when exposed to bright light, then return to somewhat clear when the intensity drops?

Best,

When these controllers coupled with the superb THK rails KR15, 20 and 26 with quality 400 step motors you have, think this is the SOTA for stepper based focus rails. Probably true, but I got the sense that the OP was looking for a more plug and play solution like I was when I bought the mjkzz contr...

Ray, Think the Trinamic device you have/had is an old device and not the same as what we've recently (past few years) developed based upon the modern TMC5130, 5160 and 5072 BOB devices. The hardware motor driver and micro controller are integrated on the same chip, as is the interface. This is a com...

Check out the many threads on the Trinamic Controllers, they are superb with the THK KR20. The TMC5130, TMC5160 and TMC5072 all work well with the THK KR20.

Best,

I looked at the video which was linked in Mike's most recent post. Youtube took me down the rabbit hole to a more recent video by the same equipment reviewer. It seems that Godox have a new 150W LED video light, the UL150. This is silent. The video claims that it is cooled entirely passively. This ...

Nice to stumble across this thread again as I just picked up the Godox SL-60W. While not as the same as this one, it's good to know Godox's claims hold up and to have some data on the output with different attachments. The "snoot" was a standard black anodized aluminum Bowens type ~200mm snoot with...

Yes it could have been the newer model, but without getting another SL-150W now, have no way of knowing. We have 3 and they are all the same, and use the LED COB & heatsink shown above and the hefty power supply shown, all well above what you would expect. They also work nice in flash strobe mode wi...

Beatsy wrote: ↑

Wed Jul 08, 2020 2:51 pm

mawyatt wrote: ↑

Wed Jul 08, 2020 9:08 am

...Another option, maybe not so awful looking is the Heyjar Lens support...

Thanks for the pointer, but I can't find anything support-like under "Heyjar" on Google. Do you have a link pls? Ta.

My bad, it's Hejnar Photo.


https://www.hejnarphotostore.com

Best,

Nice work, really like the stereo view. Agree it just "jumps" out to show the 3D effect. Is that a Wemacro lens holder on the "tube lens" which looks like a Nikon 200mm F3.5? Thanks. I can't find any brand on the lens! I call it "generic M42" but it is 200/3.5 so you may have solved a mystery. Yes,...

Nice work, really like the stereo view. Agree it just "jumps" out to show the 3D effect.

Is that a Wemacro lens holder on the "tube lens" which looks like a Nikon 200mm F3.5?

Best,

We have traveled rather far from the hardware at hand, and I don't want to mislead those potentially interested. The encoder on this hardware is linear, high resolution and appropriate for the majority of photomacrography purposes (>3" travel and practical resolution around 1um which should be suff...

I think in the sub µm range the problem is no longer the motor but stick-slip phenomena of the spindel/nut. May be the ball screw of the THK KR series has an edge over all the thread screw spindels. But probably such small movements with high accuracy and repeatability are the domain of piezo posit...

Can the Stallguard value be found by starting low so that the motor stalls and then increasing the vale until it moves? I think I've found that the behaviour is different depending on whether you are going clockwise or anticlockwise! I've noticed this too, one direction runs slightly slower than th...

We don't use the Toshiba devices but was told about them, were using some of the TI devices which were all replaced. Feedback doesn't "cure" backlash, it only masks the effects, sometimes making it worse. The dead zone caused by backlash creates "hunting" in closed loop systems, this can cause consi...

Can the Stallguard value be found by starting low so that the motor stalls and then increasing the vale until it moves? I think I've found that the behaviour is different depending on whether you are going clockwise or anticlockwise! Don't know, probably best to study the Trinamic documentation. We...