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APM 140 Doublet Owners; What Do You Think?

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156 replies to this topic

#126 AlienObserver

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Posted 06 January 2020 - 01:53 AM

I've had the APM 140 a month now.   The scope is great visually.  Starting to assemble the additional equipment to do some imaging, does it ever end.   Here is my experience so far:  I got the Stellarvue largest padded case which fits the 140 perfectly. It was recommended on CN, very handy to bring the scope in when I'm done for the night.   I went with the Losmandy G811HD mount and consider that a good decision, like it a lot, good quality, very stable, always works.   I got a GeminFi wifi dongle on ebay and can wirelessly run the mount with SkySafari on my iPad (very sweet setup for backyard party).  My favorite eyepiece is a Stellarvue 20mm Optimus 100 degree FOV, great even in marginal seeing.  PoleMaster camera makes polar alignment very precise and easy.  Those were all good calls.  But I kind of blew it on the small 2.5 in focuser.  I got the APM 2.5 in focuser with the scope, If I had that to do over I would go for the bigger focuser.  It wasn't until I got the reducer that I realized that the reducer/flattner will mount inside the larger focuser vs screwing on the back of the 2.5 in focuser.  That plus an additional 71.75mm back focus requirement to the camera puts a long tail on the scope.  I won't know the real impact until I get the camera mounted and focus.  Still waiting for the One Shot Color ZWO ASI 071P camera to arrive.  I'm hoping that was a good choice too.  Hope this is helpful to those who are at the the same stage of gear acquisition syndrome.  There is always one more thing you need, yes I got the L-eNhance filter and the Bahtinov mask the other day too, and the Deep-Sky Imaging Primer, I hope I have everything now!  I could have bought a BMW R1250GSA and be on the road without a care.

There is so much to learn just to get going with this hobby.  My dirt bike is getting lonely in the garage. While waiting for backorders I've been evaluating, various software for guiding, image capture,  and basic processing, SharpCap, DSS, APT, SGP, and Nebulosity.  Guiding is easy, PHD2 is free and works.   I think I'll go with Nebulosity for capture and basic processing because it seems clean and logical to me, will capture on my old windows laptop and I can do basic post processing on my Mac desktop.   It seems SGP and PI are the most popular suite but I don't have the mental energy for that much new software right now.  SGP is a little more powerful in the image capture area but it ends there.   Nebulosity will do processing on a basic level plus it's easy and has great documentation.  I think once I have worked through the processes and have some basic proficiency, the learning curve for more feature rich programs will be quicker and easier.  PS or PI will always be there when I'm ready whenever that occurs.  Plus I will still have all my image files.  I'm counting on that first streched nebula to make it all worthwhile.


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#127 BillP

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Posted 06 January 2020 - 02:37 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?

From a visual perspective I cannot imagine anyone is going 140 for the improved color correction as an CA in the 152 is something one needs to hunt for and not there in 99% of observing. 

 

I think a key reason might also have to do with "intent" for the scope.  For me, the larger refractor is my bigger gun, so not my every night scope.  For most observing I like my 102 as small and easier and satisfying.  But there are times when I need more light gathering to catch a target I am interested in.  I have a 10" Dob but Dobs are a hassle IMO with acclimation and keeping the mirrors clean to get all throughput possible and dealing with coma, etc.  So I wanted as large of an aperture in the refractor as possible without breaking the bank or my back, so the 152 was a better choice and continues to be (I got mine when the 140 was still a drawing board idea).  And visually I find the 152 refractor gives the 10" Dob a run for its money, even on galaxies.  10" of course does better, but not all that much, so has fallen into disuse given its more temperamental nature compared to a refractor.

 

If I was wanting a larger refractor to be my every night scope, then I imagine the 140 or a 130 would be the better choices all things being considered that are important for me.


Edited by BillP, 06 January 2020 - 02:38 PM.

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#128 dscarpa

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Posted 09 January 2020 - 11:52 AM

 I've got to carry a scope on it's mount 2/3 of the way across my fair sized yard to get from where I can view north to where I can view south. A GEM doesn't even come close to working for me. For me 5" 10", 66 and strong a 140 would be a bit much. I'm glad I went with the  nice and light Vixen 130ED SS.  David


Edited by dscarpa, 09 January 2020 - 11:56 AM.


#129 Jon_Doh

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Posted 11 January 2020 - 12:02 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

For me, it was because this was the biggest scope my mount can handle and I didn't want/need to buy another mount just for the 152.  Plus, I figured I wasn't losing much with half an inch in aperture, but whatever I lost I gained in a slightly bigger field of view with the 140 being at f7.  It was a good compromise for me and I don't regret the purchase.  


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#130 YAOG

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Posted 11 January 2020 - 12:17 PM

Thanks to everyone for your informative posts. I’ve been waffling between the APM 140 and a Mewlon 210, but I am leaning towards the APM.

I have not observed with the APM140 but the 210 Mewlon needs considerable time to cool if not left outside. Even then it will take some time once uncased. 

 

With the APM140 just be certain you can return it if there is anything you find imperfect. Just saying. 


Edited by YAOG, 11 January 2020 - 02:25 PM.

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#131 Doug Culbertson

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Posted 11 January 2020 - 02:19 PM

I have not observed with the APM140 but the 229 Mewlons needs considerable time to cool if not left outside. Even then it will take some time once uncased. 

 

With the APM140 just be certain you can return it if there is anything you find imperfect. Just saying. 

I’ve owned the APM 140 since March and it’s fine. 


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#132 gezak22

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Posted 11 January 2020 - 03:51 PM

With the APM140 just be certain you can return it if there is anything you find imperfect. Just saying. 

This applies to all scopes. And it is the reason why I prefer to buy things on "my side of the pond". With the APM, I made an exception (because I bought it from a US distributor), and fortunately it was the first refractor to ever arrive perfectly collimated at my door step.


Edited by gezak22, 11 January 2020 - 03:52 PM.

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#133 Bomber Bob

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Posted 11 January 2020 - 04:14 PM

This applies to all scopes. And it is the reason why I prefer to buy things on "my side of the pond". With the APM, I made an exception (because I bought it from a US distributor), and fortunately it was the first refractor to ever arrive perfectly collimated at my door step.

Same with my 152.  But, my AT102ED required squaring the focuser with the tube.


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#134 AlienObserver

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Posted 12 January 2020 - 02:18 PM

INFO for APM 140 users mounting the reducer/flattner:

Just to close the loop on my post #126 regarding the Riccardi reducer with the 2.5 in focuser.  It works! Focuses at ~45mm extension.   I mounted the reducer and camera with the spacers that came with the ASI071 camera plus an additional adjustable spacer (Teleskop Service M48 Variable Extension) to bring the total back focus to 71.75 mm.  So all is well with the 63mm 0.75x Riccardi/APM reducer/flatner with the 2.5 in focuser.  To mount the reducer to the focuser I had to remove the 2in friction collar by loosening three hex screws on the 2in collar to screw it out and then loosen the 3 miniature flat screws to remove the stop collar from the focuser then the 63m reducer screwed right on the back of the focuser.  I used a Stellarvue 63mm to 48mm adapter for the camera end of the reducer.  APM also makes an adapter that will work.  If you have the larger 3.5-3.7in focuser you will use the APM adapter to mount the reducer inside the focuser, I don't know how far out you will have to go to focus in that configuration.



#135 emilslomi

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Posted 05 May 2020 - 01:11 PM

I'm thinking about a good high mag eyepiece for my 140. How high have you pushed yours on the moon and planets?

 

Emil



#136 Doug Culbertson

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Posted 05 May 2020 - 01:46 PM

I've not gone higher than around 227x on the moon, using a pair of 13mm DeLites in a Denkmeier Binotron 27 at 3x with the Powerswitch. 



#137 evan9162

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Posted 05 May 2020 - 02:07 PM

245x with binos for lunar

 

326x with a 3mm DeLite (or Nagler zoom @ 3mm) works great for doubles and the moon.  All the planets are too low to comment on planetary performance.  I briefly viewed mars at 245x and 326x at the tail end of the last opposition and had excellent views at those powers.

 

I've used 490x (4mm Radian + barlow) on doubles - works great at that high power for brighter close doubles.  


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#138 gezak22

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Posted 05 May 2020 - 03:45 PM

I used 225x on Mars and Saturn using a pair of 10 mm Delos in the Binotron with with the power switch at 2.3x. I got nice, crisp views, and could not have asked for more.


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#139 orion69

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Posted 11 June 2020 - 03:45 PM

Any CA at high mags (>200x)? 



#140 gezak22

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Posted 11 June 2020 - 04:35 PM

Any CA at high mags (>200x)? 

Not to my eyes (@225x).


Edited by gezak22, 11 June 2020 - 04:36 PM.


#141 Doug Culbertson

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Posted 11 June 2020 - 04:40 PM

Not to my eyes (@225x).

Nor mine, approximately the same mag. 



#142 orion69

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Posted 11 June 2020 - 05:33 PM

Good to know, I'm considering APM/LZOS 130/780 or this for visual only.  Big price difference, but I hear only positive things about APM 140 doublet.

To be frank, can't make up my mind at this moment...  



#143 photoracer18

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Posted 11 June 2020 - 05:34 PM

I own a 140 that was custom made by Parallax who bought the optics (#040 I think) and cell from APM. Also a 6" tube w/7" dewshield. This has the heavy duty Moonlite 2.5" focuser with a heavy mounting ring that goes outside the tube. Found that the focuser tube has a 68mm thread so bought a number of screw-on adapters for the focuser including Baader Click-Lock, Baader T-ring and Baader 2" compression ring (bought as a set second hand). I also acquired a Moonilte DC motor w/slip clutch and hand controller used. Its very comparable in weight to my SVA-130EDT. I put tube ring handles on both (not the APM ones). I kind of like the color as its different. No chance to compare the 2 refractors due to weather and schedule.

Parallax-140B-1024.gif


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#144 Kunama

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Posted 11 June 2020 - 06:04 PM

If you're after near perfect optical quality then go with the LZOS optics.
I bought the APM140 after having owned 2 TOA130 and several TSAs. The APM140 is a very good scope for the price but it is not in the same league as the Taks or the LZOS optically. That's not to say that it isn't a great visual scope.

A star test and intra/extra focal patterns will show quite marked differences, especially when the scope is not quite at ambient.
By comparison the LZOS optics show as perfect a star test as I have ever seen in any of my TOAs or TSAs..... But nothing is free in this pursuit...
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#145 StarAlert

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Posted 14 July 2020 - 01:26 PM

The APM 140 is on sale. Looks like Marcus cut the price 10%. 



#146 ris242

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Posted 14 July 2020 - 03:29 PM

The APM 140 is on sale. Looks like Marcus cut the price 10%. 

Note there is a difference in the inc. VAT @ 16% till the end of the year (Covid - Govt. Reaction) whereas the original price was at 19%

but a reduction is always welcome.



#147 tony_spina

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Posted 14 July 2020 - 04:00 PM

Note there is a difference in the inc. VAT @ 16% till the end of the year (Covid - Govt. Reaction) whereas the original price was at 19%

but a reduction is always welcome.

Link?



#148 ris242

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Posted 14 July 2020 - 04:19 PM

Link?

Every item says 16% VAT included

pre covid it was 19%

 

if you need a link google - german 16% VAT - you get Germany cuts VAT from 19% to 16% until 31 Dec 2020.

 

so whatever price you see at APM remove 16%



#149 StarAlert

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Posted 14 July 2020 - 06:42 PM

Link?

https://skygazeoptic...fBoCXjIQAvD_BwE
 

https://www.apm-tele...refractors.html
 


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#150 tony_spina

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Posted 14 July 2020 - 06:43 PM

Thanks




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