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problems with long heavy lens on an ioptron skytracker

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#1 joelin

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Posted 17 March 2017 - 03:28 AM

I'm trying to use longer and heavier lenses on an ioptron skytracker and running into problems with the camera body rotating. I know these are pushing the limit of what they can do, but the 180mm nikon AI-S is such a good lens that I couldn't help but attempt it. 

 

The problem is that if you take a lens like this: http://1.bp.blogspot...00/image001.jpg and mount it on the skytracker, the length + weight of the lens can easily cause the camera body to rotate ...the simple 1/4" screw thread is not sufficient to counteract the torque generated by the lens.

 

Is there a better solution?



#2 baron555

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Posted 17 March 2017 - 06:19 AM

Better mount......because.....the simple 1/4" screw thread is not sufficient to counteract the torque generated by the lens.



#3 smeyer8015

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Posted 17 March 2017 - 06:30 AM

Something like this.  https://www.bhphotov...33/N/4075788747

 

Then you can mount at the balance point.

 

 

Scott


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#4 bmhjr

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Posted 17 March 2017 - 11:32 AM

I'm trying to use longer and heavier lenses on an ioptron skytracker and running into problems with the camera body rotating. I know these are pushing the limit of what they can do, but the 180mm nikon AI-S is such a good lens that I couldn't help but attempt it. 

 

The problem is that if you take a lens like this: http://1.bp.blogspot...00/image001.jpg and mount it on the skytracker, the length + weight of the lens can easily cause the camera body to rotate ...the simple 1/4" screw thread is not sufficient to counteract the torque generated by the lens.

 

Is there a better solution?

This is what I use.  I dont have a lens as like yours, but it works well for me.

 

http://www.ioptron.c...duct-p/3311.htm



#5 Gene3

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Posted 17 March 2017 - 12:35 PM

I ended up using the counterweight kit and a geared head for my nikon 70-200 f/2.8 and it does not have the issues that your set up has where the ballhead is attached directly to the mount.

 

DSLR Rig 2


#6 Jim Waters

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Posted 17 March 2017 - 12:37 PM

Something like this.  https://www.bhphotov...33/N/4075788747

 

Then you can mount at the balance point.

 

 

Scott

Yes - mount it from the lens.



#7 joelin

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Posted 17 March 2017 - 01:04 PM

the counterweight kit seems like a good idea but if the camera is still mounted at the body on the ball head, it seems like the camera would still be apt to rotate on the ball head

 

mounting it at the lens should reduce the torque... the counterweight kit seems only necessary if the Skytracker is having difficulty keeping the entire setup stable/smooth



#8 Charlie B

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Posted 17 March 2017 - 02:22 PM

 

Something like this.  https://www.bhphotov...33/N/4075788747

 

Then you can mount at the balance point.

 

 

Scott

Yes - mount it from the lens.

 

Definitely yes!  the lens mount is what I use on my Polarie and have no issues.

 

Regards,

 

Charlie B



#9 Cortland

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Posted 17 March 2017 - 02:45 PM

Something like this.  https://www.bhphotov...33/N/4075788747

 

Then you can mount at the balance point.

 

 

Scott

Here's how I balanced a heavy 150-500mm zoom lens and camera on an inverted, modified 504PLONG QR plate:  https://www.flickr.c...57676559403225/

You'll note the Bogen 3066 (Manfrotto 116)  tripod head, which is the only one I've got that really stays put where I want it to go.  Moment arm; that's what it takes.

Of course, I'm not trying to track the earth's rotation.

Cheers,

Cortland

 




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