Moderators: Chris S., Pau, Beatsy, rjlittlefield, ChrisR
AlmostChrisR wrote:Wicked - looks like you've cut up some big-end shells!
Three green axes of blue rotation,
two red slidey things
then either three regular orange axes XYZ,
or does each green axis adjust along its length?
Have I missed any? Time? Charm? Angular momentum?
The universal stage is mounted on an XYZ stage, so I'm not counting those. The red and blue arrows are correct, the green arrows (except for the one at the bee) are wrong. If I had shot this a little lower, you would have been able to better see the ball joint which has 3 degrees of freedom (or 3 axes). Between the ball joint and the subject is a threaded rod, so that green arrow is correct.Anodizing wouldn't work too well since it's mostly steelChrisR wrote: I want one.
Actually I want three, different sizes.
Anodized and with programmable radio controlled servo motors on each so I don't have to touch it, please. Would that be extra?
The manual version costs much less to make than the price of a used 5-axis universal stage ($4500)
It should work fine. One thing I discovered on my first try with this, full rings really limit the amount of movement you can do. They kept running into the lensjohan wrote:Cool! I have one of these standing right in front of me as we speak for the same purpose, ordered a few weeks ago, to make into the same sort of thing when I got time:
It's a gimbal mount for a lamp on a yacht. I think that I can replace the existing screws and bolts in the thing, drill a hole or two, cut a few bits off here and there and have something that allows all sorts of rotations yet focus in the same place (if "thing" at the very centre).
Everything is held together with magnets. It took quite a bit of experimenting to find the right size magnet for each joint so that it was easy to position, but still held the subject solidly in place.ChrisR wrote:How do you tighten the ball?
You can anodize stainless steel, any colour you like. It might be working on the chromium and filling the holes with dye, I can't remember now! (Chrome plating is porous, surprisingly).
Johan - mine's cheaper:
http://www.photomacrography.net/forum/v ... 0234#50234
Yes, the camera/lens is designed to rotate around the entrance pupil. Here's an earlier thread that shows the setup. The 8 axis stage sits in the same spot as the vase in the first image in the thread.dbur wrote:So how about the camera mount? Is that set up to rotate around the nodal point?
Yes, I already had in my mind a final shape, after cutting away, the same as yours. The rotating assembly directly below the bee, can I ask, what parts did you use for that? Do those, and the plastic bits, have a specific name that I can use to google and source them online? Googling "plastic sliding thingie" or "rotation widget" doesn't get me all that far =)elf wrote:It should work fine. One thing I discovered on my first try with this, full rings really limit the amount of movement you can do. They kept running into the lens
I really haven't used it very much actually taking pictures, but the X, Y, Z axes of the main stage are just used to get the rotation point aligned to the axis through the lens. The 4 axes at the ball joint are primarily used to get the subject centered at the rotation point, but at lower magnifications they can also be used for orientating the subject. At higher magnifications, I think only the other 4 axes would be used for subject orientation.rjlittlefield wrote:Clever device!
I can't help noting that position and orientation of the subject is uniquely identified by X, Y, Z, pitch, roll, and yaw --- only 6 parameters versus the 11 degrees of freedom provided by this gizmo plus the XYZ stage it's mounted on. Have you used the device enough yet to know how much help the extra degrees of freedom provide, or did they just come "for free" as part of the design?
--Rik
I think 'plastic sliding thingie' will be the official name for themjohan wrote:The rotating assembly directly below the bee, can I ask, what parts did you use for that? Do those, and the plastic bits, have a specific name that I can use to google and source them online? Googling "plastic sliding thingie" or "rotation widget" doesn't get me all that far =)
Thank you very much
Edited: found it I think. Spacer or bush, with a groove cut into it, cheap as chips on ebay. Now to find a small rotater thingie.
I don't know if you will be able to find something suitable. I machined these from a Delrin rod. Delrin is easy to machine and you can use normal woodworking tools on it. The needle assembly is from a syringe. It takes up a little too much space, so for this size insect, it's not possible to keep it out of the picture. It will probably work well on a mosquito sized insect. Perhaps a cork with a regular insect pin would be better than the syringe.That's definitely another option. I think it will be easy to add a ping pong ball diffuser or holders for other backgrounds as well.ChrisR wrote:For a first try at darkening the surface, "gun blue" seems to do a pretty good job. I just found a product called "Sight Black" which claims to leave a dull finish.
The lens has to remain stationary, so changing the focus needs to be done by moving the camera. This means, you'll need a bellows unit as well as the macro rail. I don't know if any of the sub $500 pano heads would be able to support (or be rigid enough for) a StackShot plus bellows setup. Even the StackShot isn't designed for just moving the camera side of a bellows unit, although it probably wouldn't be that hard to make a custom mount on the StackShot to do this.ChrisR wrote: I keep thinking of Panoramic Tripod Heads, which of course allow rotation around a fixed point. eg here. I don't have one.
For holding larger subjects, they appear to be potentially useful.
For holding the camera with a low profile macro rail aboard, they look as though it should be possible to do macro panoramas. You must have tried a few Ed? Is there a best type? About where do the limits come, before they won't do the job, for which you made your intriguing camera-positioning animal?
I know you said this somewhat in jest Chris, but I'm atually starting to look seriously at this as an option for just one of the axis - the innermost one which needs to rotate (ie to rotate the needle that that specimen is mounted on). Sadly I know nothing about motors or electronics, I could sure use a little help from someone who has knowledge of these, especially very small stepper motors.ChrisR wrote:?... and with programmable radio controlled servo motors on each so I don't have to touch it, please. Would that be extra?
