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CEM40EC & iPolar review

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#26 gotak

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Posted 12 April 2019 - 09:28 AM

Yes, I was talking about CEM60 models. I talked to Dr. Jiang (iOptron's CEO) on NEAF about the RA&DEC locking tricks of CEM60,  they put big warning signs & explanation in the box for that, and they're kind enough to cover it under warranty if user breaks the gears because of that.

I wouldn't take the warranty comment seriously. They state over and over in their documentation that worm damage due to user error is not covered.

 

That said after a while you get used to the mount and as long as you follow a set procedure the risk is minimal. Also, even when a worm is seriously scored (like when my IEQ45 Pro grease got too dirty) there's not always an impact to the PE.


Edited by gotak, 12 April 2019 - 09:32 AM.


#27 SteveGR

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Posted 12 April 2019 - 01:29 PM

Yes, I was talking about CEM60 models. I talked to Dr. Jiang (iOptron's CEO) on NEAF about the RA&DEC locking tricks of CEM60,  they put big warning signs & explanation in the box for that, and they're kind enough to cover it under warranty if user breaks the gears because of that.

Did they mention if they were considering updating the CEM60?  I would think that they would want the systems to match in the future but you never know.  Maybe that will be their big thing next year. smile.gif



#28 GregKo

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Posted 12 April 2019 - 01:34 PM

Hello,

 

Yes, I know he was referring to the CEM60. I have the CEM25EC and it has the same knobs he is referring to. It's hard to work them in the dark and really hard when it gets cold out. The clutch knobs are also difficult (On the 25) to turn anytime. The CEM40EC I played with both days at NEAF no longer had the knobs you tighten, then loosen a bit. That's what I was referring. Sorry if I was not clear.

 

I also noticed that the clutch knobs are a bit bigger and much easier to turn then on the CEM25. The CEM25EC is still a gem however :)

 

Greg - NJ



#29 tbcgeorge

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Posted 12 April 2019 - 02:23 PM

Well said gotak, I totally agree:)

 

I wouldn't take the warranty comment seriously. They state over and over in their documentation that worm damage due to user error is not covered.

 

That said after a while you get used to the mount and as long as you follow a set procedure the risk is minimal. Also, even when a worm is seriously scored (like when my IEQ45 Pro grease got too dirty) there's not always an impact to the PE.



#30 tbcgeorge

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Posted 12 April 2019 - 02:35 PM

No they didn't mention that, but I think upgrading CEM60 and CEM25 will be the logical step to go. CNC machining will be more applaudable for CEM60ec, as its tracking accuracy on the spec is worse than CEM25. The pricing space for CEM60 is also much bigger:)

 

 

Did they mention if they were considering updating the CEM60?  I would think that they would want the systems to match in the future but you never know.  Maybe that will be their big thing next year. smile.gif


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#31 tbcgeorge

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Posted 12 April 2019 - 02:39 PM

Thanks Peter! yes, iEQ45 is definitely compatible with iPolar. actually you can mount it either in the front or back of your polar scope slot.

 

 

Wow,  that video on the iPolar is very impressive.  I need to check if it will ever be available for iEQ45 pro mounts smile.gif

 

edit:  yes it is compatible with many types of mounts.  Happy.



#32 dapalmer

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Posted 12 April 2019 - 02:54 PM

Nice review!

Is that the 1.5" tri-pod?  And if yes, how sturdy was it?  Obviously your tracking was good, so I am wondering if you had to do anything special like keep it short or if it was fine. Know that they are offering the 2" tri-pod today, are you happy with what you got?



#33 tbcgeorge

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Posted 12 April 2019 - 10:16 PM

Thanks Doug!

 

Yes, it's 1.5" and I think it's sturdy enough with my ~20lb gears. I extended only half of the lower part of my tripod. iOptron told me they will release a Tri-pier for CEM40 later this year. That might be the upgrade I'll consider. I'm using it as a portable mount to carry around, so 1.5" tripod is definitely a proper start.

 

 

Nice review!

Is that the 1.5" tri-pod?  And if yes, how sturdy was it?  Obviously your tracking was good, so I am wondering if you had to do anything special like keep it short or if it was fine. Know that they are offering the 2" tri-pod today, are you happy with what you got?


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#34 cloudywest

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Posted 12 April 2019 - 11:20 PM

Since you have EC version, could you please try tracking without guiding? I am debating whether the EC or none EC. If EC + iPolar can get rid of guiding, I incline go for it.



#35 tbcgeorge

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Posted 13 April 2019 - 01:20 PM

I will definitely do that next time. I'm curious about that too. The only reason I didn't do it on first light was because the constant hiccup on my USB connection for the main camera. I will do some adjustment to my cable management before next clear night.

 

 

Since you have EC version, could you please try tracking without guiding? I am debating whether the EC or none EC. If EC + iPolar can get rid of guiding, I incline go for it.



#36 gotak

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Posted 13 April 2019 - 01:47 PM

There was so few guide inputs you are more or less unguided.
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#37 tbcgeorge

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Posted 13 April 2019 - 04:45 PM

That's exactly what excited me!! I'm really looking forward to another clear night to test unguided exposures!

 

 

There was so few guide inputs you are more or less unguided.



#38 tbcgeorge

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Posted 13 April 2019 - 04:47 PM

Btw, I just posted another video about finding stars, in the last 1.5 minutes, I did plate solve with CEM40EC, you'll find how accurate it is in the second attempt. (1st attempt is not relevant coz I only did a very rough home position to start with)

 

https://youtu.be/iPxq-oOQ0ag



#39 delgado39

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Posted 13 April 2019 - 11:18 PM

I’m thinking seriously about the CEM40 as my light weight GOTO mount.  So is the iOpolar a one time set up when the mount is used the first time.  Or a repetitive process each time you use the mount?  Just wondering.  The mount sounds ideal for my use.  Thanks!!



#40 niccoc1603

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Posted 14 April 2019 - 02:22 AM

Thanks Doug!

Yes, it's 1.5" and I think it's sturdy enough with my ~20lb gears. I extended only half of the lower part of my tripod. iOptron told me they will release a Tri-pier for CEM40 later this year. That might be the upgrade I'll consider. I'm using it as a portable mount to carry around, so 1.5" tripod is definitely a proper start.

Thank you for the review, do you know if the 1.5" tripod is the same as the one for CEM25P?

What is the counterweight weight?

Thanks

#41 gotak

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Posted 14 April 2019 - 07:49 AM

No the bottom plate is different on the 40. And i suspect the CW are different too maybe it's the larger ieq45/Cem60 weights.

#42 Skymind

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Posted 14 April 2019 - 07:53 AM

The base of CEM40 is 120 mm, same as iEQ30 Pro. So it should be the same tripod of iEQ30 Pro. CEM25P base is 100 mm. The CW shaft of CEM40 is 20mm, same as iEQ30 and CEM25, so they all should share the same CW, 10 lbs.


Edited by Skymind, 14 April 2019 - 07:54 AM.

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#43 niccoc1603

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Posted 14 April 2019 - 08:34 AM

have you measured backlash?

 

My CEM25P works and tracks fine but I had to work on it to reduce backlash



#44 tbcgeorge

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Posted 14 April 2019 - 09:26 AM

Yes, I chose CEM40 for the exact reason. iPolar is built-in, which means the center of rotation should be always the same, so you only need to do the 3 position calibration once in its life time. 

 

 

I’m thinking seriously about the CEM40 as my light weight GOTO mount.  So is the iOpolar a one time set up when the mount is used the first time.  Or a repetitive process each time you use the mount?  Just wondering.  The mount sounds ideal for my use.  Thanks!!



#45 tbcgeorge

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Posted 14 April 2019 - 09:29 AM

gotak is right again! I think it's a different design for CEM40. but not sure if it's compatible with CEM25's tripod...

 

CW looks bigger too. 5kg

 

 

Thank you for the review, do you know if the 1.5" tripod is the same as the one for CEM25P?

What is the counterweight weight?

Thanks



#46 tbcgeorge

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Posted 14 April 2019 - 09:31 AM

Thanks for the clarification! I'm just considering to get some more CW.

 

 

The base of CEM40 is 120 mm, same as iEQ30 Pro. So it should be the same tripod of iEQ30 Pro. CEM25P base is 100 mm. The CW shaft of CEM40 is 20mm, same as iEQ30 and CEM25, so they all should share the same CW, 10 lbs.



#47 tbcgeorge

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Posted 14 April 2019 - 09:32 AM

Not yet, I'll add it to the test items next time, thanks!

 

 

have you measured backlash?

 

My CEM25P works and tracks fine but I had to work on it to reduce backlash



#48 niccoc1603

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Posted 14 April 2019 - 09:42 AM

 iPolar is built-in, which means the center of rotation should be always the same, so you only need to do the 3 position calibration once in its life time. 

 

I don't get it, if you move the mount how can you get the rotation axis again without the routine?


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#49 Skymind

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Posted 14 April 2019 - 12:33 PM

I don't get it, if you move the mount how can you get the rotation axis again without the routine?

The rotation axis of the iPolar is fixed with respect to the RA axis. No matter how you move the mount, the rotation axis is unchanged. The first time and lifetime calibration by rotating the RA to 3 positions is to find the center of the iPolar camera chip.


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#50 niccoc1603

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Posted 14 April 2019 - 01:40 PM

The rotation axis of the iPolar is fixed with respect to the RA axis. No matter how you move the mount, the rotation axis is unchanged. The first time and lifetime calibration by rotating the RA to 3 positions is to find the center of the iPolar camera chip.

Ok, so how do you get the polar axis for each session? Just by a single platesolve?




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