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Light 4" Apo - any and all suggestions

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#1 klim

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Posted 23 January 2020 - 08:25 PM

I have a TV NP101. Anything lighter? Thanks.



#2 Nippon

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Posted 23 January 2020 - 08:37 PM

Vixen ED103s and Takahashi FC 100s. One of the two FC 100 f/7.5 models is really light. Can never remember if it's the DC or DF model.


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#3 justusliebig

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Posted 23 January 2020 - 08:38 PM

there is a es103 in the classifieds *wink*

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#4 Sam M

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Posted 23 January 2020 - 08:48 PM

Not a triplet, but the AT 102ED would shave about a pound.  Although, if it's more stability you're after, longer focal lengths and thus longer OTAs, could create more twist on your mount.  



#5 Bomber Bob

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Posted 23 January 2020 - 08:49 PM

AT102ED weighs about 9 lbs -- no finder.



#6 Defenderslideguitar

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Posted 23 January 2020 - 08:59 PM

Our classic vixen 102fl is a pretty light package

The newer four inch Taks   as stated above fit the bill as well

tv np 101  short and stubby.... not heavy  though it looks like it should be



#7 tadam

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Posted 23 January 2020 - 09:06 PM

Borg 100/101 ED.  About 5-6 pounds



#8 stevew

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Posted 23 January 2020 - 09:52 PM

My Stellarvue Access 102 is a pretty sweet high contrast scope.

9 lbs with rings and dovetail.

Being small and light weight is what attracted me to it, as well as the FPL53 glass.

 

Steve

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#9 Steve Allison

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Posted 24 January 2020 - 05:28 AM

Takahashi FC-100DF. Six point one pounds of optical perfection.

 

This is about the only 4 inch refractor that could sway me away from my FS-102NSV, and only because it is about half the weight.

 

Still, even with my arthritic back, I just can't seem to let my FS go.


Edited by Steve Allison, 24 January 2020 - 05:29 AM.

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#10 dr.who

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Posted 24 January 2020 - 05:53 AM

Borg followed by a ES 102 FCD100 carbon fiber followed by a FC-100DF


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#11 Scott Beith

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Posted 24 January 2020 - 06:20 AM

Tak FC100 would be my suggestion for high quality glass and low weight.  Pick your focal ratio / weight.

 

My Stellarvue SV102V is very heavy.  


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#12 25585

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Posted 24 January 2020 - 08:19 AM

DC is the lightest FC, but you will need to buy an adapter for 2" eyepieces. The DF gas a heavier focuser but comes with the adapter.

 

mikeDknight here has a DC.


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#13 OldManSky

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Posted 24 January 2020 - 09:12 AM

WilliamOptics Zenithstar 103.  FPL53 doublet, 9.6 pounds with rings & dovetail(s).

I'm really enjoying mine.



#14 Spikey131

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Posted 24 January 2020 - 09:51 AM

If my priority in a 4” refractor was light weight, I would consider the Takahashi FC100 DC, and stick with 1.25” eyepieces.  What’s the point of getting a 5 pound telescope and adding a 2 pound eyepiece?

 

I did consider this but ended up with an NP101 since weight wasn’t the highest priority.

 

And then got a 3” refractor as my light weight travel scope.

 

I am not sure what the OP’s goal is, but sometimes the best light weight 4” scope is a 3” scope.


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#15 Nippon

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Posted 24 January 2020 - 10:33 AM

Seems The Tak FC100 DC combines the lightest weight with the smallest tube assembly. My Vixen ED103s is pretty light at about 9 pounds tube only but the tube is anything but small.


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#16 Starman81

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Posted 24 January 2020 - 12:32 PM

I had the TV NP101 and it is built like a tank. Replaced it with the Tak FC100 DC, which felt like a toy in the hand but of course the optical performance was probably* anything but... Currently have the SV102A which is a bit longer than the NP101 at f/7, but weighs roughly the same, maybe a little less.

 

But the clear choice here is the FC100 either DC or the slightly heavier and more capable DF (2" capability). 

 

*I say probably because I had to sell it before getting a chance to observe with it bawling.gif


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#17 Nippon

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Posted 24 January 2020 - 12:45 PM

I had the TV NP101 and it is built like a tank. Replaced it with the Tak FC100 DC, which felt like a toy in the hand but of course the optical performance was probably* anything but... Currently have the SV102A which is a bit longer than the NP101 at f/7, but weighs roughly the same, maybe a little less.

 

But the clear choice here is the FC100 either DC or the slightly heavier and more capable DF (2" capability). 

 

*I say probably because I had to sell it before getting a chance to observe with it bawling.gif

Bummer that you had to sell it before using it. Might have been more painful if you had a chance to use it first. I have to struggle to let myself sell astro gear even if it is something I don't seem to use much. I've found that my three scopes rotate in and out of the favorite scope status position. It's a little bit like being able to scratch that new scope itch without spending any money.


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#18 coopman

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Posted 24 January 2020 - 01:48 PM

I would have to recommend one of the FC100 models. The DC only weighs about 6 pounds, which is remarkable.

#19 SeattleScott

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Posted 24 January 2020 - 03:03 PM

Seems The Tak FC100 DC combines the lightest weight with the smallest tube assembly. My Vixen ED103s is pretty light at about 9 pounds tube only but the tube is anything but small.

Tube only advertised as under 8lbs. Mine weighs 9lbs including rings, dovetail, diagonal and RDF.

I believe Tak would have a slight edge over Vixen because fluorite is lighter than FPL53. 6.1lbs is a little misleading considering that is bare tube and a smaller focuser optimized for 1.25” but if your intention is to stick with 1.25” it totally works. The Borg is very fast if I recall and while that makes it small and light, it won’t have the same level of correction as Tak, TV or Vixen.

Scott

Edited by SeattleScott, 24 January 2020 - 03:08 PM.

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#20 Doug D.

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Posted 24 January 2020 - 03:55 PM

Another vote for an FC100-whatever version (that makes most sense to you).  For me it was a DL, not the lightest nor shortest but I'm always amazed at how easy it is to handle and lug around.


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#21 25585

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Posted 24 January 2020 - 04:33 PM

My DL is my 4" lightest apo, but its also the most delicate. 


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#22 rob.0919

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Posted 24 January 2020 - 04:46 PM

APM (LZOS optics) 105mm / 650mm fl

 

Its certainly not the lightest at around 7kg (15.4lbs) with rings, but hey, its Russian. Don't worry about the weight.

 

49123978571_6481eabbcd_c.jpg


Edited by rob.0919, 24 January 2020 - 04:47 PM.

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#23 Starman81

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Posted 24 January 2020 - 04:50 PM

APM (LZOS optics) 105mm / 650mm fl

 

Its certainly not the lightest at around 7kg (15.4lbs) with rings, but hey, its Russian. Don't worry about the weight.

 

49123978571_6481eabbcd_c.jpg

 

What a beast! I guess I could expect that for a well-built triplet. 

 

'Lighter' in this case will definitely mean doublet.



#24 Nippon

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Posted 24 January 2020 - 05:01 PM

Tube only advertised as under 8lbs. Mine weighs 9lbs including rings, dovetail, diagonal and RDF.

I believe Tak would have a slight edge over Vixen because fluorite is lighter than FPL53. 6.1lbs is a little misleading considering that is bare tube and a smaller focuser optimized for 1.25” but if your intention is to stick with 1.25” it totally works. The Borg is very fast if I recall and while that makes it small and light, it won’t have the same level of correction as Tak, TV or Vixen.

Scott

Did you weigh your ED103s with rings, dovetail and RDF? I have found Vixen Optics USA specs to be less than reliable. Brian on the other hand has always taken good care of my needs. But the printed specs???



#25 mikeDnight

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Posted 24 January 2020 - 05:43 PM

The Takahashi FC100DC is a very light scope but still retains the superb thermally compensating Tak lens cell. It's light yet still well engineered and with outstanding optical quality. At very high powers you may want the MEF micro focuser. I find it a great advantage when observing between 300X &400X. 

 

2019-01-28 19.57.27.jpg


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