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Zhumell Z100 100mm f/4 Newtonian

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#1 Sky Muse

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Posted 30 December 2016 - 05:39 PM

It survived the long journey from China to my neck o' the woods; not a major dent or a tear at all on the box anywhere...

 

box.jpg

 

UPS sure did take its sweet time in delivering this.

 

Upon opening the box, the manual presents itself.  Alas, no collimation instructions within...

 

manual.jpg

 

The telescope itself nestled inside the inner box...

 

box2.jpg


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#2 PirateMike

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Posted 30 December 2016 - 05:55 PM

Let's see it!


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#3 PXR-5

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Posted 30 December 2016 - 06:02 PM

Let's see it!


He's keeping us in suspense untill he gets a drum roll...
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#4 PXR-5

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Posted 30 December 2016 - 06:05 PM

Wait, sit quietly, I think I can hear... it's time for dinner, you can unpack your thingy later, lol :)

Edited by PXR-5, 30 December 2016 - 06:33 PM.

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#5 Sky Muse

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Posted 30 December 2016 - 07:12 PM

Only the red-dot finder and two oculars were included with the kit.  The oculars...

 

oculars.jpg

 

oculars2.jpg

 

I can't tell if the retaining-rings for the lenses within the eyepieces are of metal, or plastic.

 

These "wide-angle" Kellners, are they really true Kellners, I wonder?

 

Synta includes similar with their Orion-branded kit, the SkyScanner 100mm; same style it appears, but a 20mm instead of the 17mm provided with this clone.  A 17mm seems a bit unique, perhaps, and for an entry-level telescope. 

 

Overall, the bundled eyepieces look rather promising.


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#6 Sky Muse

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Posted 30 December 2016 - 08:10 PM

Voila...

 

Z100 100mm f4 Newtonian.jpg

 

It's cuter than a bowl of grits with a tab of sweet butter on top. :smirk:


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#7 Sky Muse

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Posted 30 December 2016 - 08:12 PM

There's enough spacing around the primary to allow for...FLOCKING...

 

primary.jpg

 

:whee:

 

I was a little worried that there wouldn't be.


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#8 PXR-5

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Posted 30 December 2016 - 08:30 PM

Real nice, I've been eyeing them for almost a year now.

When the clouds clear let us know how it performs.
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#9 john gabriel

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Posted 30 December 2016 - 09:39 PM

Congratulations on your safe delivery!   :)  I kno wnothing about these objectives, except from what I've heard Zhumell has a generally good reputation.

 

And what will you flock this with?  I know ProtoStar flock board is wonderful to work with, but also can be difficult to obtain.


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#10 Sky Muse

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Posted 30 December 2016 - 09:40 PM

Real nice, I've been eyeing them for almost a year now.

When the clouds clear let us know how it performs.

There's nary a cloud in the sky here, not e'en a single wisp, and with Orion beginning its ascent from the southeast.  I'll be waiting until it reaches high noon before I take a few afocal shots through the bundled oculars.


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#11 Sky Muse

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Posted 30 December 2016 - 09:44 PM

Congratulations on your safe delivery!   :)  I kno wnothing about these objectives, except from what I've heard Zhumell has a generally good reputation.

 

And what will you flock this with?  I know ProtoStar flock board is wonderful to work with, but also can be difficult to obtain.

Thanks!

 

I had bought a roll of Protostar flocking about ten years ago.  I flocked the 6" f/5 with it, and I still have a good bit left over.



#12 Sky Muse

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Posted 30 December 2016 - 10:08 PM

The collimation scene, as reflected by and within the secondary mirror, and as it arrived, untouched...

 

collimation-123016.jpg

 

There's no doubt about it.  I'm going to have to replace those spider-vanes.


Edited by Sky Muse, 30 December 2016 - 10:14 PM.

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#13 SteveG

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Posted 30 December 2016 - 10:22 PM

The collimation scene, as reflected by and within the secondary mirror, and as it arrived, untouched...

 

attachicon.gifcollimation-123016.jpg

 

There's no doubt about it.  I'm going to have to replace those spider-vanes.

Wow, looks very good. I would wait on worrying about the spider. I've had scopes with thick 3-vane spiders and there often just as good (or bad) and a standard thin 4-vane.


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#14 SteveG

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Posted 30 December 2016 - 10:29 PM

 

 

attachicon.gifoculars.jpg

 

attachicon.gifoculars2.jpg

 

I can't tell if the retaining-rings for the lenses within the eyepieces are of metal, or plastic.

 

These "wide-angle" Kellners, are they really true Kellners, I wonder?

 

.

I'm sure they're Kellners, and on that fast scope it won't matter how wide they are because between the coma and astigmaism from thos eyepieces, the edges will be poor. If you have other eyepieces with known afov's, compare them and let us know.

 

I once had an Orion 18 mm Kellner, that had a 56* afov. It was very impressive in my f8 scope, but didn't hold up in anything faster.


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#15 Sky Muse

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Posted 30 December 2016 - 11:04 PM

I just took it out for a few minutes.  A haze has just moved in, as confirmed by enabling the satellite layer of my local news online weather radar.

 

I placed the kit on top of the trunk of my car, and took a gander at Orion with both bundled oculars, and Sirius with just the 10mm.  It's about 40° out, which is bit chilly.  The stars were sharp enough, and compared to what I've seen with my 6" f/5 in the past.  I'll need to bump up the 400mm focal length with the Klee 2.8x barlow in order to reach some meaningful and revealing magnifications, if the 4" aperture holds out.  The included mount is not bad, but not ideal either.  I'll need to use it more, and the telescope itself, before reaching a final conclusion.


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#16 Augustus

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Posted 31 December 2016 - 02:16 PM

What a nice little scope!


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#17 Sky Muse

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Posted 31 December 2016 - 07:39 PM

Well, it rained all day today, hence no afocal daytime-terrestrial shots to offer, so instead I decided to illustrate the various and sundry aspects of the kit...

 

A comparison of the kit with familiar, or perhaps not-so-familiar, household objects...

 

comparison.jpg

 

I don't think it's bigger than a bread-box; a dollar for your thoughts?

 

The dovetail assembly...

 

dovetail assembly.jpg

 

The dovetail-clamp is not of metal, but of what looks to be high-impact plastic.  The dovetail-bar is screwed onto the optical-tube, of metal, and is exactly the same as that of the Celestron C90 belonging to my elder brother(but I've used it more than he has).

 

The dust cap has a removable plug, and I assume for stopping down the aperture.  Given the 100mm diameter of this Newtonian, along with its f/4 secondary obstruction, I don't think I'll be stopping it down that often...

 

dust cap.jpg

 

The mount rides on three squares of what I take to be PTFE, or Teflon.  The bottom of the mount is threaded for a tripod, and just like that of the Orion "SkyScanner" 100mm...

 

mount base.jpg

 

When placing the Orion-branded variant onto the very tripod that Orion sells specifically for same, I wonder how the position of its focusser works out for those who consider the union.


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#18 Sky Muse

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Posted 31 December 2016 - 07:46 PM

I almost forgot: the specs label on the optical-tube...

 

label.jpg

 

It's rather bland, and not nearly as purty as that slapped onto the Orion...

 

http://www.astromart...99/744596-2.jpg


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#19 john gabriel

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Posted 31 December 2016 - 10:20 PM

The collimation scene, as reflected by and within the secondary mirror, and as it arrived, untouched...

 

attachicon.gifcollimation-123016.jpg

 

There's no doubt about it.  I'm going to have to replace those spider-vanes.

Yup.  I'd say those are a bit over-engineered.   :thinking:   


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#20 Sky Muse

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Posted 31 December 2016 - 10:38 PM

 

The collimation scene, as reflected by and within the secondary mirror, and as it arrived, untouched...

 

attachicon.gifcollimation-123016.jpg

 

There's no doubt about it.  I'm going to have to replace those spider-vanes.

Yup.  I'd say those are a bit over-engineered.   :thinking:   

 

I'm going to think of something; and you know me, if it's possible, it will happen.  I won't be able to take it apart, flock and modify it until I take several afocal shots through it with the included oculars, and in the untouched condition as it arrived.


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#21 john gabriel

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Posted 01 January 2017 - 01:47 AM

 

 

The collimation scene, as reflected by and within the secondary mirror, and as it arrived, untouched...

 

attachicon.gifcollimation-123016.jpg

 

There's no doubt about it.  I'm going to have to replace those spider-vanes.

Yup.  I'd say those are a bit over-engineered.   :thinking:   

 

I'm going to think of something; and you know me, if it's possible, it will happen.  I won't be able to take it apart, flock and modify it until I take several afocal shots through it with the included oculars, and in the untouched condition as it arrived.

 

I once considered using bicycle spoke lugs for vane attachments - you know the ones that tighten up the threaded ends of the spokes.  Just solder the right threaded rod or cut screw to the vane tips, and you're set.  Or even use bike spokes for the vanes.  Nice, strong, adjustable tension.   (A couple of those here have been tuned down a bit in my drill.) 

DSC03126-b.jpg


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#22 izar187

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Posted 01 January 2017 - 02:44 AM

I just took it out for a few minutes.  A haze has just moved in, as confirmed by enabling the satellite layer of my local news online weather radar.

 

I placed the kit on top of the trunk of my car, and took a gander at Orion with both bundled oculars, and Sirius with just the 10mm.  It's about 40° out, which is bit chilly.  The stars were sharp enough, and compared to what I've seen with my 6" f/5 in the past.  I'll need to bump up the 400mm focal length with the Klee 2.8x barlow in order to reach some meaningful and revealing magnifications, if the 4" aperture holds out.  The included mount is not bad, but not ideal either.  I'll need to use it more, and the telescope itself, before reaching a final conclusion.

The 2.8x Klee is a good helper and match for a little scope like this.

It may well make the included WA Kellners  more better too.


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#23 tony_spina

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Posted 01 January 2017 - 02:21 PM

Sky Muse 

How does the z100 compare to the 6" f/5? Would love to get your insights on these two scopes


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#24 Sky Muse

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Posted 01 January 2017 - 04:16 PM

Sky Muse 

How does the z100 compare to the 6" f/5? Would love to get your insights on these two scopes

The 4" aperture is going to be dimmer than the 6" of course, but as a result of today's photo-shoot, and said results to follow in my next posting, the optics of the 4" are quite impressive.


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#25 Sky Muse

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Posted 01 January 2017 - 04:31 PM

The rain finally cleared, but with the cold still, so I decided to take the Z100 out on an afocal photo-shoot of various and sundry objects of the surrounding landscape.  Alas, there are trees and more trees surrounding me, and the nearest building of an appreciable height is several miles away, and unseen from my home.

 

For the shoot, I decided against using the bundled mount, as I don't have a way to elevate it, so I mounted the Z100 on my trusty Voyager I instead...

 

Z100-Voyager I.jpg

 

It's as though the back half of the optical-tube was chopped off, in relation to the mount.

 

Only the bundled eyepieces, and the Klee 2.8x barlow, at the ready...

 

oculars.jpg

 

My usual first target is this power transformer across the way to the south...

 

transformer.jpg

 

And now, nature unfolds from this point on...

 

tree.jpg

 

That's the secondary mirror's shadow in that one.

 

The following was taken through the 10mm inserted into the Klee...

 

tree3.jpg

 

To be continued...


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