Unable to attach DSLR to Orion rings camera mount
Posted 06 February 2013 - 09:44 AM
Posted 06 February 2013 - 10:11 AM
Posted 06 February 2013 - 12:16 PM
Posted 06 February 2013 - 12:24 PM
Posted 06 February 2013 - 12:31 PM
Posted 06 February 2013 - 01:52 PM
Posted 06 February 2013 - 02:05 PM
How on earth did you do that? What holds the camera from rotating? That locking nut didn't do it for me.
Posted 06 February 2013 - 02:15 PM
Although now that I look at it closer my screw looks longer, try removing the top washer?
Posted 06 February 2013 - 02:36 PM
The previous post about a ball head is a good idea. For that I would completely remove any black screws from the top and thread the ball head onto the exposed screw until it is tight.
Finally there is a small chance that the screw itself may come loose. If that happens take a + Head screwdriver, open the ring and tighten the screw.
Posted 06 February 2013 - 03:42 PM
1) Screw the black circle all the way down (tighten)
2) Screw on your camera as much as you can with it still facing forward
3) unscrew (loosen) the black circle so that it tightens up against the camera.
4) done, everything should be tight
Posted 06 February 2013 - 06:14 PM
Nikon D90 is a heavy camera even without lens. My lens is pretty heavy too and long. There's simply not enough stopping friction from this plastic locking nut to overcome total moment, at least when tightened by hand.
I was able to tighten nut using plumbing wrench somewhat stable in neutral position (camera at 12 o'clock). But any side by side movements of the tube severely compromise this "stability". I can feel small flexes and vibrations of the 85mm lens. With the Nikon 200 f4 prime lens I can visually see it sagging downward. Any more lateral shake or finger push to the lens - and the moment of the camera can exceed the one of the screw/nut. The arrangement is weak on all counts: rotate tube to the left - nut comes loose, to the right - screw comes loose. I would not call this situation "stable and secure". The screw itself is pretty long and thin and is another source of non-damped vibrations.
So I guess the solution is to add support ring for the lens or use lighter camera/lens combination (and a plumbers wrench!).
Posted 06 February 2013 - 08:35 PM
I actually think you had the right idea with the washer part, but I would try a different material that's less resilient, such as thick card stock or cardboard built up to that thickness. Make the washer as large as the nut, because the larger contact area for the base of the camera is important for stability. The washer should be thick enough to allow no more than 2 to 3 turns of thread to go into the camera base, but not thin enough to hit the inside limit of the hole. That would cause instability, and as previously mentioned, the danger of puncturing the camera. The idea is for the threads to pull down on the camera against the washer and nut by tightening the nut against the camera as in Intensity2x's Step (3), above.
The camera unit, including lens, should ideally be balanced at its mounting point (the tripod hole), just like your OTA would be on your mount. On the larger primes, Nikon provides a tripod mount to help achieve this goal, although it's not always there. Needless to say, whenever it's available, it should always be used in lieu of the one on the camera.
Posted 06 February 2013 - 09:27 PM
Posted 08 February 2013 - 05:15 PM
With a longer lens, you will want to use a tripod ring attached to the lens, that mounts the lens to the telescope ring. This will balance the weight to either side of the scope ring and should create less torque.
My 350D Rebel XT with the nifty 50 lens seems plenty secure on the standard Orion scope ring mount. But if I were to put my 70-200mm zoom on, I'd mount it via the tripod ring that attaches to the lens.
You could try a mini ball mount, but in the end you'll be dealing with the same amount of torque where it attaches to the scope ring. I have the Giottos MH1004 and it's pretty nice. But I haven't used it to mount the camera yet - I use it to mount the Orion smartphone holder to the female 1/4-20 threads on the other scope ring...
Posted 09 February 2013 - 04:25 AM
For the front ring I went to the hardware store and picked up a pipe hanger that fit my lens. Sorry I do not know the actual name for it but it is the kind used for electrical conduit. An open top circle that bolts tight(get a wing nut while your there) with a bump on the bottom that you insert a screw through and into the ring. Use 3 nuts, 1 inside the ring, 1 under the ring to hold the ring at the right hight, and the third to lock the screw to the ring. Line the ring with felt or rubber to protect the lens. My rings were to close so I have to losen the wing nut a little to focus but it also prevents the lens from shifting focus when positioned at odd angles for long exposers.
Posted 09 February 2013 - 11:56 AM
Also, I found that using a mini ball mount does help. For some reason it is easier to secure the ball mount to the scope ring than it is for the camera. Also, it entirely sidesteps the issue of loosening the post from the scope ring, and/or the camera when you adjust position, because the ball mount (at least the one I posted above) spins freely about the locked post when you free the ball to adjust the camera.