Does Stackshot buzzing noise cause vibrations?

[Lou Jost]

It's well known that the Stackshot emits a fairly loud noise when in High Precision mode. Wouldn't that cause camera and lens vibration?

Edit: I meant the title of this thread to be "Does Stackshot noise (in high precision mode) cause camera vibration?"..I didn't realize there was a length limit. Sorry.
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[rjlittlefield]

[Lou Jost]

Rik, thanks for answering that question definitively. I guess I won't worry about it anymore. It is counter-intuitive to me that such a loud noise doesn't cause vibrations, but your test is convincing.
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[rjlittlefield]

It's always possible that your StackShot or something else about your setup is different from mine, so that for you vibration could be a problem.

You might want to consider my info as just an illustration of one way to test, and see what yours does in similar circumstances.

If it's different from mine, that would be good information for everybody to know.

--Rik

[Lou Jost]

It may be important to test the exact system one uses for normal microphotography since, as you say, the resonant frequencies of the system are what determine the effect, and these will change unpredictably with every minor change in the system. Will give it a shot.
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[dlg]

I would worry about a lot of other things first. That includes:
- air movement in room.
- Breathing of operator.
- stability of floor.
- stability of camera support when moving rig and changing center of gravity.
- Heat induced motion of specimen from illumination sources.

The whine is at a pretty high frequency (kHz), so I doubt you could get any significant resonance frequency on a camera set-up. The frequency also changes a bit with each step in the high precision mode, so it is not a constant factor.

my 2c.

[Lou Jost]

dlg, those factors can be eliminated fairly easily. It is quite another matter if the main device holding the camera causes inherent vibration. Like a Trojan horse, it sits there in the heart of the set-up, invited by us innocents. We spend our time building vibration-proof supports, shutting off refrigerators, waiting for volcanos to get quiet, and then we bring this noisy thing into the sanctuary and put our camera right on top of it.

But Rik's tests show it is harmless, at least on some set-ups. Nevertheless resonances are very hard to predict and I believe it is something worth thinking about and testing for any new set-up.
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[painfree]

Rik, can you show the procedure to connect a microscope objective to your 100mm and stackshot... Also you are using a Mitsumo,, can any other objective be used such as a 50x .7NA ? I do not know as a new forum member if this is the proper place to ask such a question but perhaps??

[rjlittlefield]

painfree, welcome aboard!

Asking here is as good as any. Starting a new thread and linking back here would have been better, but that sort of thing requires knowing quite a bit about how to use BBCode formatting tags. (BTW, I edited your posting here to remove the unnecessary quotation of my entire post.)

General instructions on mounting microscope objectives can be read at FAQ: How can I hook a microscope objective to my camera?.

One picture of an objective (4X) mounted on my 100 mm lens can be seen at http://www.photomacrography.net/forum/viewtopic.php?p=101444#101444.

In theory, a 50X NA 0.7 could be used in the same way, assuming that it's one of the modern infinity designs. However, the working distance of an objective with that spec would typically be so short as to be unmanageable. Also that spec normally goes along with requiring to be used with a cover glass, which at that large NA is very important to get right. The great things about the Mitutoyo 50X NA 0.55 are that 1) it's designed to be used without a cover glass, and 2) its working distance is 13 mm -- easy to work with.

--Rik