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What is your favorite common-sized Dob (6-12")?

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42 replies to this topic

#26 Markovich

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Posted 21 July 2021 - 01:47 PM

MINE!


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#27 elzopilote

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Posted 21 July 2021 - 03:44 PM

In a Venn diagram of portability, aperture and cost, the 8" solid tube Dobsonian is in the sweet spot. 


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#28 aatt

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Posted 21 July 2021 - 03:49 PM

It’s all good really if the optics and conditions are as well. I do like my 6” though. It is a very capable little scope and tack sharp because of its killer mirror ( probably a Terry O).
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#29 Frenchy

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Posted 21 July 2021 - 04:23 PM

My 12" lightbridge. It goes in either our 16' altima or 13' rogue easily and only needs to be broken down if going into the altima. I've heard a lot of crying (mostly on facebook) how truss dobs are horrible because they will loose collmination if you breath on them. I have not found this to be the case. I collminate about every 5 times it goes out of my garage and into the driveway. I will collminate every time it has a car ride. From having a 12.5" starfinder, zhumell z8, 10" lightbridge plus, and my current pre 07 12" lightbridge, it is the best dob i've owned so far....I do want a 16" or 18" NMT someday, but this has been serving me well so far. I made it look pretty and function extremely well too with some minor mods.

Lb4

Edited by Frenchy, 21 July 2021 - 04:24 PM.

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#30 ShaulaB

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Posted 21 July 2021 - 04:45 PM

My home built ten inch f4.5 Dob has been my beloved scope for over 30 years.
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#31 kfiscus

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Posted 21 July 2021 - 10:05 PM

12".  I have two of 'em.


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#32 Jon Isaacs

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Posted 22 July 2021 - 04:21 AM

In a Venn diagram of portability, aperture and cost, the 8" solid tube Dobsonian is in the sweet spot. 

 

I would say the 10 inch is the sweet spot, at least it is for me.  The limiting factor in transportability is the OTA length and the 8 inch F/6 and the 10 inch F/5 are essentially the same length.  The 10 inch is heavier but still very manageable (at least if one is 6 ft tall and over 200 lbs).  And performance-wise, the 10 inch has 25% better resolution and gathers 56% more light.  

 

Jon


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#33 izar187

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Posted 22 July 2021 - 04:41 AM

What is your favorite common-sized Dob (6-12")?

_______________________________________________

 

 

6" f/5   plus   12" f/5  

 

(+/- a few decimal point on the specs of either)

 


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#34 Alex65

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Posted 22 July 2021 - 05:03 AM

For me its my 6" f8.

 

My reasons are:

 

1) I'm an old school dinosaur and this was once the standard size telescope for many amateurs. If it was good enough for generations of amateurs it is good enough for me (just a simple star gazer). The more modern style Dob mount is a nice bonus.

 

2) I don't have a lot of storage space, so it is the right size for me when not in use.

 

3) After working as a RN for 26 years my back isn't what it used to be! My 6" Dobsonian is the largest weight / size that I care to haul around these days, or indeed capable of doing.

 

4) Lastly, I'm very happy with the optics and aperture size and it suits my simple observing needs perfectly. I don't have aperture fever or envy, don't need electronics nor fancy mounts.


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#35 Kenny1291

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Posted 23 July 2021 - 09:27 PM

I have 3 dobs, split between my 2 homes; 10”, 14” and 15”.  The one used most is my 10” by far.  It is a great do-it-all scope for visual.  Relatively easy to transport, even in my Accord sedan.  I never run out of things to see with the 10”.  Of course, the other larger scopes will show more and brighter objects, but I always weigh the logistics vs performance when I travel to darker sites.  All 3 have DSCs and EQ platforms.  But as I get older, that 10” gets more and more used.  Oh, the views in that 10” are very sharp.

Yea I ended up getting a 10" skywatcher goto just the other day. I was going for a 12" but I really needed to think about size and if I was willing to move a big scope that often and price made more sense. Perhaps some day I'll get one of those other behemoths.



#36 LIVE LONG

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Posted 24 July 2021 - 09:27 AM

   My 10" Dob is my favorite, and most often used scope. I refer to it as the "GOLDILOCKS" of Dobsonian's, not to big not too small.

 

   It is easy to roll out of my garage, using a hand truck. I almost consider it a Grab & Go scope. 

 

   It gives great views of the moon, planets, double star's, glob clusters, and open clusters.

 

   As already been mentioned, a 10" Dob must be properly collimated, or you will get poor view's.


Edited by LIVE LONG, 24 July 2021 - 09:36 AM.

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#37 Tom Stock

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Posted 24 July 2021 - 12:55 PM

   My 10" Dob is my favorite, and most often used scope. I refer to it as the "GOLDILOCKS" of Dobsonian's, not to big not too small.

 

   It is easy to roll out of my garage, using a hand truck. I almost consider it a Grab & Go scope. 

 

   It gives great views of the moon, planets, double star's, glob clusters, and open clusters.

 

   As already been mentioned, a 10" Dob must be properly collimated, or you will get poor view's.

Agree with this. I tried many scopes for "grab and go".  I tried a 5" SCT on altaz mount, C90 on a tripod, an ST80 on a GEM with push-to, a 6" F4 reflector,  and some others.

 

What I found is that I always wanted MORE than a small scope could provide.

 

When I purchased  a 10" dob I soon realized I could pick it up and carry it, completely assembled from the garage to anywhere in the yard.

 

It also fits in the back seat of the car.

 

It's NOT a travel scope by any means, but it's the best "grab and go" scope ever and the views are great.


Edited by Tom Stock, 24 July 2021 - 05:28 PM.

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#38 MeridianStarGazer

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Posted 24 July 2021 - 04:05 PM

I bet I could lift a 10" dob in one piece if I commit to it. Only 60 pounds. Still risky with some old injuries. The tendon near my left elbow now complains when I lift an 8" dob in one piece.

 

I was and still am bothered that a 10" has a 34mm thick mirror, which might take a while to cool. But if I were to look at M13 or M31, I know I'd much rather be using the 10" than the 8".

 

But where do you put the base? The front passenger seat? Or do you have a large enough trunk? For a small sedan, only the 8" allows bringing a friend along.



#39 Jon Isaacs

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Posted 24 July 2021 - 06:17 PM

I bet I could lift a 10" dob in one piece if I commit to it. Only 60 pounds. Still risky with some old injuries. The tendon near my left elbow now complains when I lift an 8" dob in one piece.

 

I was and still am bothered that a 10" has a 34mm thick mirror, which might take a while to cool. But if I were to look at M13 or M31, I know I'd much rather be using the 10" than the 8".

 

But where do you put the base? The front passenger seat? Or do you have a large enough trunk? For a small sedan, only the 8" allows bringing a friend along.

 

I used to carry my 10 inch in a 1989 Nissan Sentra.. pretty tiny. 

 

I put the base in the back seat at one end and then placed a towel across the cross piece and rested the focuser end on the cross piece. The mirror end tested on the seat.

 

Jon


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#40 turtle86

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Posted 24 July 2021 - 06:47 PM

I would say the 10 inch is the sweet spot, at least it is for me.  The limiting factor in transportability is the OTA length and the 8 inch F/6 and the 10 inch F/5 are essentially the same length.  The 10 inch is heavier but still very manageable (at least if one is 6 ft tall and over 200 lbs).  And performance-wise, the 10 inch has 25% better resolution and gathers 56% more light.  

 

Jon

 

I agree.  My 12.5 and 18" truss Dobs aren't too difficult to set up, but my 10" tube Dob (Orion XTi) is almost a grab and go in comparison, and definitely gets more use when I want to do short sessions in my backyard.  As I find a 10" tube Dob relatively easy to set up, I wouldn't have any reason to use an 8".

 

On the other hand, I'd never want to deal with a 12" tube Dob.  An 8 or 10" is very manageable, but for me a 12" is about as ergonomically friendly as a water heater.  lol.gif


Edited by turtle86, 24 July 2021 - 06:51 PM.

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#41 izar187

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Posted 24 July 2021 - 08:45 PM

 

 

On the other hand, I'd never want to deal with a 12" tube Dob.  An 8 or 10" is very manageable, but for me a 12" is about as ergonomically friendly as a water heater.  lol.gif

Very true about water heaters and ergonomics.
The thing to do if ones scope is this size, is some un-water heatering countermeasures.

 

Water heaters don't come with wheels.

A hand truck takes all the work out of moving a large solid tube around the yard. IME

Plus you have a handy hand truck to use for daylight projects.

Got stairs... then stair climbing hand trucks like those used in industry work well.

 

Water heaters also don't come with handles.

But 12" +  solid tubes sure can. And should.

Strap on or bolt on, they can make all the difference in the world. IME

For me, two large in-line ones, along the the top of the tube so to speak.

One on either side of the center of gravity. Exactly so, or in a preferred chosen variant.

 

IMHO a significantly more important issue for a 12"+  solid tube telescope option is vehicle size for trips to darkerness.

 

12" is a favorite size for me, because I have chosen all three countermeasures together.

Wheels, handles and vehicle.


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#42 sopticals

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Posted 25 July 2021 - 12:43 AM

My 10" gets the most use. Quick and easy to get "under the stars". Have owned a number of 6"-8" dobs but somehow they just didn't quite "cut it".

 

Stephen.(45deg.S.)


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#43 Jon Isaacs

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Posted 25 July 2021 - 10:29 AM

12" is a favorite size for me, because I have chosen all three countermeasures together.

Wheels, handles and vehicle.

 

 

I do not recommend choosing a vehicle simply because a 12 inch solid tube Dob will fit.  Truss Dobs are a better solution.  A larger vehicle will cost you every time you drive it, every month you pay the insurance.. 

 

My 12.5 inch fits in most cars and takes up much less space than a tube Dob.  The foot print is 19" x 20" and it's about 28" tall when nested. 

 

5311761-Discovery Dob in Car CN.jpg
 
Jon



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