iOptron Counterweight Extension Bar for CEM25/ZEQ25

iOptron Counterweight Extension Bar for CEM25/ZEQ25

  (2 Reviews)
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About this product

Model:  iop_cem25_cw_ext_7126
Part Number:  7126

Counterweight extension bar for iOptron CEM25/ZEQ25/IEQ30 mounts.

This attaches to the original counterweight bar which can help with balancing.


  • Diameter: 20mm
  • Net Length: 7.25 inches
  • Length (including threads): 7.75 inches

Customer reviews

Average Rating (2 Reviews):  
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Rating (max 5):  
iOptron Counterweight Extension Bar for CEM25/ZEQ25
07 June 2020  | 

I use this extension bar for my CEM25P mount and it helped me achieve balance with a large Bresser Messier AR-127L telescope (8kg).

Rating (max 5):  
Much as expected
05 November 2019  | 

There's not all that much to say about a counterweight bar extension. It's the right diameter, the advertised length and it has the right threads top and bottom. It looks like it's made from stainless steel.

Moreover, my mount is an iEQ30 Pro, not a CEM25 or a ZEQ25, but if you look hard at iOptron's on-line info you find that the extension is supposed to fit, which it does. In fact, it seems to be exactly the same extension bar that they sold for the iEQ30 Pro when that was their flagship "30" mount (3 weeks ago?).

In practice it fits as expected, with only a very slight misalignment of the bar axes at the join. You can just feel it, and a weight that just slides freely up and down the original bar needs an extra 1/4, or thereabouts, turn of the locking screw to get it over the bump.


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