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APM 140 Doublet Owners; What Do You Think?

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155 replies to this topic

#101 Doug Culbertson

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Posted 03 May 2019 - 08:07 PM

That’s a beautiful setup; I really like that SV mount. It looks great on the Avalon tripod. 

 

FWIW, I bought my 140 through Lunt Solar Systems. The scope was delivered by UPS and I paid no additional charges. I don’t blame you for being po’d. 



#102 Tyson M

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Posted 03 May 2019 - 11:29 PM

I recently bought a new APM 140 and put it on my Stellarvue M-150.  At one time Stellarvue had talked about adding encoders to it, but apparently discontinued the mount before that happened.

 

I contacted Serge at Astro Devices and he made customized encoder mounts for it - he did a fantastic job, and did it all via dimensions I emailed him.  He charged me nothing extra, just the standard price for encoders.

 

I've included a pic of the setup.  Very solid and pretty portable.

 

The APM 140 is a very nice scope.  However, just let me say that even though I made a purchase from Markus several years ago, and it turned out fine, he took me to the cleaners on this one.  We came to an agreement on price that would include shipping/tax and customs (which is on the invoice I paid).

 

Received the package and soon after received a bill from DHL for custom charges. Talked to Markus many times and he claimed customs were paid at his end.  Anyway, long story short, he refused to work with DHL in any way to figure out why I was billed. I ended up paying DHL because I didn't want this going to a collection company.

 

So, I'm happy with the telescope, not happy with Markus - this will be the last time I ever make a purchase form him again. 

 

Troy

Beautiful set up.  Looks like you may need an extension for your M-150, otherwise you will be viewing on the ground. Unless you raise up the legs, which always seems to compromise stability and prone to vibrations easier.


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#103 troy6666

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Posted 04 May 2019 - 07:30 AM

You're right.  I'm going to put a Losmandy extension on it - can't decide on 8" or 12"



#104 junomike

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Posted 04 May 2019 - 07:49 AM

I'd go 12" as  8" won't be enough IMO.


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#105 Tyson M

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Posted 04 May 2019 - 12:57 PM

You're right.  I'm going to put a Losmandy extension on it - can't decide on 8" or 12"

 

 

I'd go 12" as  8" won't be enough IMO.

I agree ^  with Mike.  That 140 is a big scope and needs the 12".



#106 troy6666

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Posted 04 May 2019 - 05:33 PM

I'll order the 12" and and give it a test drive.  

 

BTW - in reference to the issue I had with the transaction to purchase the scope from Markus; he read the post and told me he will resolve the issue by next week and get me a refund for the customs he says he already paid.  I hope he does as I think we can use all the above board vendors we can get in this hobby, and I think APM offers some good products.

 

I let everyone know how this turns out next week.


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#107 Jon_Doh

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Posted 05 May 2019 - 09:50 AM

Buy from Outdoor Sports Optics in PA and pay no tariffs.  



#108 troy6666

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Posted 08 May 2019 - 05:42 PM

Unfortunately I think the guy who runs OSO was sick or just not there for a few days.  So, I went directly to Markus.



#109 Hankster

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Posted 08 May 2019 - 06:12 PM

Here's mine on a Losmandy G811 and a pier mount. Has been amazing visually, just now getting into astrophotography with it. Used Scopeguard case for a 150 fits perfectly with room for the finder scope and diagonal.

Attached Thumbnails

  • IMG_0811.jpeg
  • IMG_0812.jpeg
  • IMG_3325.jpeg

Edited by Hankster, 08 May 2019 - 06:20 PM.

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#110 stevew

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Posted 08 May 2019 - 09:30 PM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price? 

Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?

I would assume both would have similar levels of optical figuring.

 

Steve



#111 Hankster

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Posted 08 May 2019 - 09:53 PM

Those were the major factors for me.


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#112 emilslomi

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Posted 08 May 2019 - 10:28 PM

Metoo, both.



#113 Peter Besenbruch

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Posted 08 May 2019 - 11:09 PM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price? 

Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?

I would assume both would have similar levels of optical figuring.

Yes, the more compact size and better color correction play a role.



#114 evan9162

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Posted 09 May 2019 - 12:43 AM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price? 

Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?

I would assume both would have similar levels of optical figuring.

 

Steve

Yes to both.  I do a lot of imaging, and the 140 has better color correction over a wider range of wavelengths vs. the 152.  With a UV/IR-cut filter blocking below 420nm, you can do broadband/OSC color imaging with very little to no CA.  It, of course, excels at RGB and narrowband imaging.

 

The 140 is almost a foot shorter and several pounds lighter than the 152, so is easier on the mount.  It's also more comfortable to use visually, since the eyepiece won't be as close to the ground when pointing vertical



#115 Doug Culbertson

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Posted 09 May 2019 - 05:56 AM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price? 

Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?

I would assume both would have similar levels of optical figuring.

 

Steve

If you go by my first couple of posts in this thread, I asked pretty much the same thing of 140 owners. Those responses, as well as the use of FPL53 and the slightly lighter weight over the 152 figured greatly in my decision making. In my mind, the extra hassle factor of greater weight and longer OTA weren’t wort it for an extra half inch of aperture.

 

One other thing that entered my mind, fairly or not, was that both telescopes were the same price, leading me to believe that the 140 was probably the better telescope optically.



#116 gezak22

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Posted 09 May 2019 - 12:43 PM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price? 

Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?

I would assume both would have similar levels of optical figuring.

 

Steve

All else being equal, at a constant f ratio, the large aperture will have poorer (color) correction.

Edit: I forgot their f-ratios are different.

 

But the mounting requirement was the bigger issue for me.


Edited by gezak22, 09 May 2019 - 02:10 PM.

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#117 bobito

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Posted 09 May 2019 - 05:05 PM

Beyond size and weight , a primary factor on getting the 140 vs 152 was the 2.5 degree FOV with the 140.  The 152 is just 2 degrees.


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#118 Bomber Bob

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Posted 09 May 2019 - 05:59 PM

One other thing that entered my mind, fairly or not, was that both telescopes were the same price, leading me to believe that the 140 was probably the better telescope optically.

 

Makes sense.  I bought my 152 on Black Friday 2017, and Markus had dropped the 152 down to 140 prices.  And I spent most of that day trying to decide between the two.  Back then, I didn't do deep-sky imaging.  I'm mostly a visual observer.  So the 152 hit the spot.  And, though it may be silly, it's so cool to think / say, "Gonna take out the 6" refractor tonight."

 

Does the 140 have better color correction than the 152?  IDK!  I know how my 152 performs, and I'm happy with it.

 

BB's Pet Peeve:  Imaging is a broader term than just deep-sky imaging, yet that seems to be the general use on CN.  I can make digital images of just about any astronomical object.  I haven't tried deep-sky imaging with my 152, but others have, and their results look good to me.  I have imaged the Moon & a few planets, and... Wow!  A 6" refractor sure can break out the details!  

 

Even if the 2 APM EDs are equivalent, mount requirements are definitely a factor.  FOV?  I didn't buy my 152 for its ultra-wide FOV.  The longer tube affects both balance, and eyepiece height at the zenith.


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#119 HydrogenAlpha

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Posted 09 May 2019 - 07:03 PM

I'm just curious as to why everyone in this thread purchased the 140mm FPL53 rather than the 152 FPL51 when they are the same price?
Is it that the smaller size is easier to handle/mount, or is it the thought of better color correction in the 140mm?
I would assume both would have similar levels of optical figuring.

Steve


I don't have one, but given the two options I would most certainly pick the 140 as I'm an imager. The 140 is also faster at f/7, so even if I did narrowband and couldn't care about colour correction, this would make a difference to me. I would also most certainly want to put a reducer on it, and that tends to exacerbate colour fringes.

If I had to do visual only, however, I'd pick the 152. I'm quite tolerant to visual CA

#120 evan9162

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Posted 13 May 2019 - 12:06 AM

I was waiting for darkness last night (to do some imaging) with a beautiful, first quarter moon high in the sky.  I swapped in my binoviewers for a quick lunar viewing session.  I used a pair of 10mm Radians and a TeleVue 2x barlow element for around 250x. 

 

The views were excellent.  Seeing ranged from average to decent.  I spent a lot of time viewing Vales Alpes waiting for moments of good seeing.  The sun was just rising over the southern limb of the valley, casting some long shadows.  During a few fleeting moments, I caught hints of parts of the central rille.  

 

Scanning down the terminator was a wealth of high contrast views of sunrise within craters.  Several craterlets had the very tips of their central mounds illuminated by the sun peeking over their rims.  Not a scant hint of color outside what was expected from the Radians themselves (which is off-axis color).  

 

Posting all the images I've been taking with my 140 would become tedious, and I expect that most people are interested in visual usage rather than imaging...but to sum it up, it is a potent imaging scope, capable of capturing fine detail even during long exposures.  



#121 AlienObserver

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Posted 14 October 2019 - 11:50 AM

Going to order the APM 140 what are the considerations between 3.7 and 2.5 inch focuser besides cost?



#122 emilslomi

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Posted 14 October 2019 - 02:08 PM

2.5 visual, maybe imaging - 3.7 counterweight to the lens, prettier, visual and imaging

I'm visual only, so I settled for the 2.5 myself.

 

Emil



#123 gezak22

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Posted 14 October 2019 - 02:16 PM

Going to order the APM 140 what are the considerations between 3.7 and 2.5 inch focuser besides cost?

Maybe a binoviewer could benefit from the larger focuser. I have a binoviewer in my 2.5" focuser, and while it works fine, I do notice a little bit of off-axis motion.



#124 25585

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Posted 14 October 2019 - 04:54 PM

I would go for the 3.7 focuser. Stronger is good with heavy loads, & to take a 3" diagonal is great. 

 

How does the 140 do on red stars, planets & generally? Is it neutral or more shifted away toward the other end?  



#125 evan9162

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Posted 15 October 2019 - 09:09 PM

I think the correction is slightly favored towards blue, to reduce CA and give the best correction for eye sensitivity.  

 

Focused on green, correction in blue is better than in red (so red is further out of focus)

However, focused on red, the correction is quite good.

Focused on blue, the correction isn't as good.

 

Test data:

https://www.cloudyni...ived/?p=6817671


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