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BarrySimon615
scholastic sledgehammer
Reged: 03/01/04
Posts: 924
Loc: New Orleans, LA
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NW,
Erik refers to his earlier post which gives you a good answer. I guess my reason for liking two pan handles is it just feels more natural and the effort is easier. By having to hands on the handles it helps steady YOU up to some extent. Get that 2nd handle and try it for yourself and you will know exactly what I am talking about.
Barry Simon
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sftonkin
sage
Reged: 02/25/04
Posts: 395
Loc: Kent, UK
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Barry,
I have my Miyauchi 20/37x100 on a 501 head -- it really is not man enough for the job.
A question about the 516, if I may: Can the binoc be used form horizontal to vertical without having to rebalance it by sliding the plate in the head or, like the 501, is there a limited "balanced" range because of the separation between the altitude axis and the centre of mass of the binocular?
--------------------
Stephen
Hindsight: The only truly diffraction-limited system
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BarrySimon615
scholastic sledgehammer
Reged: 03/01/04
Posts: 924
Loc: New Orleans, LA
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The 516 balance spring is set up for a 16.5 lb/7.5 kg load, so I am assuming that would be ideal. The Miyauchi 100's are a few lbs. lighter than this, but close. The altitude tension adjustments and the balance spring will compensate for any misbalance. It will have an easier time doing this with a heavy load than the 501 head which is designed for a much lighter payload.
Remember that since the whole weight of the binoculars is above the axis of rotation for altitude, no balance in and of itself is really possible. If you look at my photo posted here of my Miyauchi 20x100's on the Light Speed Wagon mount you may be able to notice two things -
1) The dovetail that the binoculars sit on can be moved forward and back on it's cradle. That certainly helps, but you also have:
2) The capability of moving the cradle up and down to coincide the vertical balance point of the binoculars (plus the cradle on which it sits) with the altitude bearing of the mount itself. (With my 6" f/5 refractor, because of it's diameter, the cradle is virtually bottomed out. With the 20x100 binoculars, the cradle is flipped upside down and at the top of it's adjustment range.)
Only when you balance a load in both horizontal and vertical directions can you get "perfect" balance.
With a video pan head it is really impossible to balance a load vertically, and all the horizontal adjustment in the world won't help completely. Thus the balance spring and the heavy hydraulics of a good video pan head are needed to compensate for this shortcoming. So your last statement about there being a limited "balanced" range because of the separation between the altitude axis and the centre of mass of the binoculars was absolutely correct.
Barry Simon
Edited by BarrySimon615 (03/02/04 02:57 PM)
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BarrySimon615
scholastic sledgehammer
Reged: 03/01/04
Posts: 924
Loc: New Orleans, LA
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Here is another shot of the "Wagon Mount" this time outfitted with a control bar that is similar to the two handle concept of the Bogen/Manfrotto pan head pan handles. I originally called it a Parrot Perch, but perhaps I should call it a Crow's Perch.
Note the handle was made for me by my friend, Ken Dauzat "Ken's Rings and Things". It in no way alters the mount in that it relied about existing threaded holes.
Barry Simon
Edited by BarrySimon615 (03/02/04 03:10 PM)
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Anonymous
Unregistered
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Oh...ok. That's seems cool. I'll keep that in mind the next opportunity I have to get an additional handle. Thanks.
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sftonkin
sage
Reged: 02/25/04
Posts: 395
Loc: Kent, UK
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Thanks, Barry; you have made it clear that I need to educate myself about how video heads work, esp. with respect to the "balance spring". I presume this is a spring that, like a counterweight, is designed to apply torque to the altitude axis in opposition to that applied by the weight of the binoc (as in "counterweight springs" in Tom Krajci's dob design)? If not, what does it do (or can you point me to a source of information on this sort of thing)?
I do like the look of your Lightspeed mount, especially wwith the altitude axis being so close to the centre of mass of the Miyauchis; I understand that these mounts are no longer in production?
--------------------
Stephen
Hindsight: The only truly diffraction-limited system
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