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APM 152 ED APO #002

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#151 chboss

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Posted 17 January 2013 - 02:50 AM

James, why compare your ED Apo to SCT's ,which have a completely different aperture and focal length?

I think a comparison to other 6" APO's would make more sense and give a real measure of this scope's performance.

best regards
Chris

#152 James Ling

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Posted 17 January 2013 - 05:59 AM

Hi Chris...

I can understand your suggestion , which may also be the same as many other CN members, on the comparison be made against another 6" APO...., sounds logical....

Unfortunately, in my country, there are many people using 5" or smaller triplets APO, and as of what I know , for the 6" APO, one is my friend, Richard, which has the APM 6" triplet APO....

Perhaps I need to ask around, and if there is someone who has one, and willing to do this shoot out, with me, then that will be great....

Regards

James Ling

#153 chboss

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Posted 17 January 2013 - 07:34 AM

Yes I was thinking about Richards APM 152.... I met him about two years ago when staying in Singapore for a few days. Unfortunately there was no time for some stargazing. ;)

Keep the comparison and test results coming I will follow your progress.

best regards
Chris

#154 James Ling

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Posted 25 January 2013 - 11:48 PM

Yes I was thinking about Richards APM 152.... I met him about two years ago when staying in Singapore for a few days. Unfortunately there was no time for some stargazing. ;)

Keep the comparison and test results coming I will follow your progress.

best regards
Chris


Hi Chris and ALL....

Weather has been bad for the past few weeks after the 1st shootout between my friend, Richard's 6" APM triplet APO, and my 152 APM ED APO....

Today, as of now, noon time (GMT +8), the weather is sunny and seems great , with blue skies and some clouds, which if it continues till this evening, Richard and me will be doing the repeat of the shootout for these 2 APM scopes again.....
Tonight full moon also will be great to test the ED APO.....

Hope all goes smooth and some valuable comparison be made between these 2 APM scopes.....

Regards

James Ling

#155 zjc26138

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Posted 26 January 2013 - 12:11 AM

Hope you have clear skies tonight James. Looking forward to your report as aLways.

#156 dweller25

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Posted 02 February 2013 - 02:04 AM

Any updates James ?

#157 James Ling

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Posted 02 February 2013 - 09:57 AM

Hi David , Zach Coldebella and ALL...

Sorry for not able to provide any update of the 2nd shoot out , at this moment......

Last weekend, Richard is out of town, and back quite late , as such we tried to plan for the next day....

But Sunday weather is not promising, as such we did not meet up for the 2nd shoot out....

Today, weather is quite good, but Richard is probably away to Malaysia again, as I could not contact him...

Perhaps I see whether he will be back tomorrow , and arrange the shoot out, if tomorrow's weather is good.

As for my other plans, I have mounted my 10" mewlon onto the top of this 152 APM ED APO, ready for coming side walk......

Regards

James Ling

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#158 t.r.

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Posted 02 February 2013 - 11:09 AM

Thats not on a G-11, is it?

#159 johnnyha

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Posted 02 February 2013 - 08:05 PM

Ay yi yi... that looks a bit precarious! :grin:

#160 mblack

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Posted 02 February 2013 - 08:27 PM

Ay yi yi... that looks a bit precarious! :grin:


Yes indeed. Slippage comes to mind, unless those rings on the refractor are torqued down.

James, I am assuming you have this rig secured, because it looks like a disaster in waiting.

:shrug:

#161 Moonglum

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Posted 02 February 2013 - 09:51 PM

Relax, that's just how he stores them...

#162 johnnyha

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Posted 02 February 2013 - 09:52 PM

I can think of better storage solutions... :lol:

#163 James Ling

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Posted 02 February 2013 - 11:24 PM

Thats not on a G-11, is it?


Hi ALL...

Yes... That's my old Celestron G11, upgraded to G2....
And I am using the GM8 LW tripod....

If just one scope , whether is the 152 APM ED APO or the 10" Mewlon, one 22 lbs counterweight is all I need...

But when I piggy back the 10" Mewlon over the top of my APM ED APO's, I need 3 X 22 Lbs counterweights to balance it.... :foreheadslap:

REgards

James Ling

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#164 James Ling

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Posted 02 February 2013 - 11:46 PM

Ay yi yi... that looks a bit precarious! :grin:


Yes indeed. Slippage comes to mind, unless those rings on the refractor are torqued down.

James, I am assuming you have this rig secured, because it looks like a disaster in waiting.

:shrug:


Hi All....

Yes... It seems not wise to have 2 scopes mounted vertically, but I just going to do tracking but not going for GOTO slew...during the side walk.....
This setup is for visual, not for AP...

Surprisingly, at RA slew, the motor does not stall, instead it stalls under DEC slew...But I have lowered the speed to 500 for the G2 system....

All the preliminary test are done yesterday before I do the actual outdoor coming side walk......

From the photo I mounted the vixen dove tail bar directly over the 2 mounting rings of the APM scope...
Then I secured the losmandy wide dove tail over the vixen dove tail, so that the Mewlon will be secured by the losmandy wide dove tail....

Regards

James Ling

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#165 johnnyha

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Posted 02 February 2013 - 11:55 PM

AT THE VERY LEAST I think you need another of those little Losmandy saddles...

#166 James Ling

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Posted 02 February 2013 - 11:55 PM

I can think of better storage solutions... :lol:


Hi Kirk Schmitt , Johnny and ALL...

For the APM, I leave it on the mount, but with bags of silica gels, placed at both ends of the scope....

For the Mewlon, when not in-use, is kept permanently at all times, inside a electronic dry cabinet.....

Regards

James Ling

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#167 Pete-LH

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Posted 03 February 2013 - 12:08 PM

I have been to Singapore ... you definitely need a dry cabinet there. Great Idea!
I must say you do optimize the capability of your mounts.

#168 James Ling

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Posted 20 February 2013 - 08:26 PM

I have been to Singapore ... you definitely need a dry cabinet there. Great Idea!
I must say you do optimize the capability of your mounts.


Hi Pete and All...

I welcome you and all CN members to visit our small city island, Singapore....

And if possible can show our simple side walk location to anyone of you , if you have the time, when visiting our city....(attached photo)

Although our city is light polluted and not suitable for DSO observing, (possible for some, at certain darker spots), and this make the refractor , an ideal equipment ....
In this case the 152 APM ED APO really never disappoint anyone viewing through it , especially Jupiter.....

Last Monday side walk , although Jupiter is much smaller than the December one, but at 200X, the APM ED APO really shows very details on the surface of Jupiter and its 4 moons.

And I can assured anyone who has placed the order for the 152 APM ED APO, will not be disappointed with the views form Jupiter, especially when the atmosphere and seeing is good....

But for those who are very concern on CA, perhaps you will need to fork out a few more thousands of dollars to go for the triplet, coz at last Monday night, on the 9 days old moon, there is a very thin layer of greenish-yellow (CA)that is being observed...
Of course , if I compared this to my C6R F8, the amount is like 1/3 or even smaller, definitely less than 50%....
And in my opinion, anyone that has a chromacor or the raycorr (in the near future), will be able to work well with this scope, on further reducing its CA level....

Regards

James Ling

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#169 zjc26138

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Posted 20 February 2013 - 08:54 PM

Thanks for the report and the invite James! I'd love to get to Singapore one of these days.

#170 James Ling

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Posted 21 February 2013 - 02:49 AM

Hi Zach Coldebella .....

Thanks.....

And please send me a PM , before you come over....
And I can make some arrangement.....

And is the same to the rest of CN members.....
As Singapore is just 1 deg N above the equatorial.....
It will be hot and wet, but not very cold , like those in the climate regions......

Regards

James Ling

#171 SteveG

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Posted 21 February 2013 - 02:10 PM

Same thin layer of greenish-yellow I see on the moon with my ED120. Not a problem at all, and no where near the CA you see on an achro. I expect a little CA on a $4K 6" APO.

#172 James Ling

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Posted 21 February 2013 - 08:03 PM

Hi Steve....

Yes, my WO88ED doublet also has a very thin layer......

Hi ALL...

This coming weekend, if the weather is good, I will be doing another shootout at my friend's roof top......

This time is a little interesting...., as I am adding my 8" ISTAR , and using my friend's AP900 mount.....in this shootout.....

REgards

James Ling

#173 Bill Barlow

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Posted 21 February 2013 - 08:08 PM

Hi James,

Have you had the chance to compare the APM 152 doublet with the Edge C8 or the C9.25 SCT yet?

Bill

#174 James Ling

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Posted 21 February 2013 - 08:38 PM

Hi Bill....

Sorry the very last shootout at my friend's place is not successful, as such tomorrow we are doing another round of shootout....
The delay is simply due to the poor weather, mainly heavy rains during the past few weeks.....

BTW, my friend has 4 equatorial mounts, and two are on fixed pier, at his roof top.....
So there shouldn't be any problem to have his C8 edge put up again....

I just hope that the weather is good when we do the shootout again.....

REgards

James Ling

#175 Bill Barlow

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Posted 22 February 2013 - 08:58 PM

Hi James,

Sounds like a fun night if the weather cooperates for you.

Bill






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