Alan64

I have the Celestron "AstroMaster" 70EQ...

There are two versions of these kits, one with an equatorial mount, and the other with an alt-azimuth mount.

Your 90mm f/11 achromat falls within the Sidgwick standard for colour-correction...

...so you're good to go there.

I have the same eyepieces...

They're okay.  They're "Kellner" type eyepieces, three-element.  Plossls are four-element eyepieces, and performance-driven for most any telescope, yet economical.

Where in the world are you located?  I could then direct you to listings of these items, and more besides.

Also, for what objects in the sky are you needing a filter?

You can certainly make use of a quality 2x-barlow.  That's all you need, for you can transform it into an approximate 3x mulitplier by simply inserting the barlow into the telescope first...

...and for those occasions when wanting to max out the aperture.

3 hours ago, Astro_Dad said:

Ah got it. How do they sit vs genuine Circle T volcano tops? I have a 6mm example, rarely used. 

I would think a toss-up between the two.  The UOs are more comfortable(ergonomics), and fully multi-coated possibly, whilst the Baader/Fujiyama are fully broadband-coated(optical-quality).  Still, you can't go wrong with either type.

4 minutes ago, Astro_Dad said:

UOVT?

University Optics "Volcano Top"...

Those were made by the Tani optical-house in Japan, by Mr. Tani himself.  He eventually retired, and is no longer with us I'm afraid.  I got my own in the early to mid 1990s.  They are reputedly more comfortable, via their sloped tops.  They're no longer available new, but used ones are offered for sale in the equipmental marketplaces on occasion. 

Then, many of the old and wonderful optical-houses of Japan, some if not many employing only a handful of workers, were swept away by the tsunami of 2011.

Later, I got these Baader Abbe orthoscopics, and the same as the current Fujiyamas...

Those two marques are/were manufactured by Masuyama of Japan.  The Baader examples were sold for only a few years, or less.

15 minutes ago, Astro_Dad said:

Worth a look I thought. I’ve ordered the 14mm to try with the Skymax 127 - I like the views through “orthos” -  I have a 365 Astronomy branded 10.5 mm piece that produces good views. 
Thanks for the detail @Alan64, I’m becoming very interested in optical design and the history behind it - a latent physics interest probably. I’m sure the likes of Fujiama’s and others will impress down the line…

I assume they would Barlow successfully?

Most any eyepiece barlows well, if with a quality barlow.

The "Starbase" eyepieces are made by an optical-house in Hanamaki, Japan; not Takahashi.  Takahashi has never made lenses, only optical-tubes and mounts.  The fluorite-doublet within my Takahashi FS-102 was made by Canon-Optron, for example.

The only ones I'd be interested in having are the 6mm, and perhaps the 9mm.  These eyepieces excel on small, tight(non-diffuse) objects; the Moon, the planets, and double-stars.

Oftentimes, it's quality you're after, rather than quantity.

I couldn't stand it any longer, not knowing for certain, so I removed the focusser...

Incidentally, the cover-plate, for securing the pinion-gear against the rack, was not installed evenly.  It didn't take much to correct it, but there was no excuse for that.    

The optical tube has three baffles: 1, 2, 3...

I would like to retain those, but I would have to mark their positions, remove them, then flock them along with the rest of the tube.

The fitting for the attachment of the slow-motion control rod...

Those are machine-screws, therefore the six holes are threaded, and just as I expected.  Set-screws will fill those in nicely.   

I will be making a light-shield for the focusser of this one, and just as I did for the Antares 805...

It turns out that the tube-rings were shipped via "UPS Surepost" <grumble grumble>, but still on time.  Thankfully, they have "Arrived at Post Office", locally.

I feel a trip to my local hardware at the county-seat coming on, for screws and such to attach the rings to the bar, and for set-screws to fill the six holes in the tube.

20 minutes ago, Ian McCallum said:

Nope.🙁

Refractors differ from reflectors(Newtonians, Newtonian-Dobsons, Cassegrains) , and in very important ways.  Don't think for a moment that you have to have an 8" or 12" refractor, which has nothing whatsoever to do with price, absolutely not, for the refractive experience stands alone, and regardless of aperture.

I have reflectors, several types, up to 150mm in aperture.  I have a Newtonian at 200mm, but I've yet to observe with it.  But there's just something about my refractors that keeps me coming back for more, from the beginning, to the end...

Smaller refractors are more fun than you can imagine.

2 hours ago, Ian McCallum said:

The collimation on the 200P is okay, just my memory that's faulty. 🙄

It's towards the higher end of the magnification scale, where I get larger but indistinct images, as you'd expect... I'm thinking for example of the 5mm eyepiece and smaller, etc. 

Perhaps it's time to look at the bigger DOB's again... 🤔

I don't know if the question has been asked: have you ever owned or observed through a refractor?

I've seen globular-clusters through this wee 50/600 achromat...

But for those who have never experienced a refractor, 80mm is the minimum to suggest; yea, even a 70mm is praiseworthy...

A reasonably-priced gamble...

https://www.firstlightoptics.com/evostar/sky-watcher-capricorn-70-eq1-refractor.html

It sounds to me that you need a new star-diagonal.

It appears that the star-mirror diagonal that came with your Bresser kit...

https://www.bresser.de/en/Astronomy/Telescopes/BRESSER-Messier-AR-127S-635-EXOS-1-EQ4-Hexafoc.html

...is exactly like the one that came with my Explore Scientific 127mm f/15 Maksutov...

However, you can make use of a 2" star-mirror, and thereby a 2" eyepiece or two.

I don't understand what you mean, precisely, as to an "extended prism".  You can certainly get a 90° star-prism diagonal in the 1.25" format.

I think it's great that you have an observing pal.

Carpet/rug tape, and piano-felt...

Congratulations are in order.  Your new DZ will be quite the eye-candy machine, and just as my own FS-102 has been...

That one was produced in 2003, and the last example in 2005.  Takahashi then took a break from manufacturing the 100mm+ fluorite-apochromats, and for several years, up until about 2012 or 2013.

The new ones are lighter in weight, whereas my older one is a veritable porker.  Consequently, you'll be likely to observe with yours, and more often than I do with my own.  Enjoy.

I have decided that I will not be wanting to keep this telescope on its yoke-style mount.  I will need to remove these fittings, of metal surprisingly, and fill the holes with set-screws...

Back in June, I had gotten a new old-stock Meade LX70 EQ5-class mount.  It came with this dovetail-bar, and 150mm in length...

That will do quite nicely.  I have also ordered tube-rings, 100mm ID...

Those are scheduled to arrive by this coming Friday.

Incidentally, this OTA is the same as that of the Meade "Infinity" 102mm kit, and with an AZ3-class mount. 

Would that I might've run across just the OTA of that kit.  There would've been less holes to fill, but no matter really.

First light, and with the eyepieces and other that came with the kit; during the day, although there's not much to see: the usual power-transformer in the distance...

...and trees, lots of trees...

Surprisingly, I saw very little false-colour.  Those images were taken with the bundled 26mm MA(modified-achromat) eyepiece(23x).

Then, at night; Jupiter, at 133x(the bundled 9mm MA combined with the 2x-barlow)...

The false-colour is quite apparent there, but then Jupiter is awfully bright.  In addition, the barlow most probably contributed as well. 

I don't know how I did it, with the mount as it is.  Saturn, at 133x...

Miraculous, that shot was, and out of eight attempts.  The view, live, was, as always, considerably sharper. 

The Moon through the 26mm MA (23x)...

I had to set the camera to sub-second exposures, as the light gathered was a bit overwhelming, particularly that from an almost full Moon.  Through the 9mm MA(67x) only...

The view at 133x was not as sharp, not with these kit eyepieces and barlow, but not too bad.  I do have those better to use with the telescope.

This is where I drew back away from the telescope, and took a shot of the Moon's reflected light shining through the eye-lens of the 9mm MA...

That completed the first light for the telescope. 

This doublet is hereby declared to be worthy of a right good blackening, and with new spacers perhaps.  I am in great earnest to do so, along with the blackening and flocking of the tube throughout, down to the last square millimetre.

I may now banish the bundled eyepieces, diagonal and barlow back to their box, and for all time, for I saw some graininess at one point using these items.  They're practically identical to what came with my Meade "Polaris" 114mm f/8 Newtonian and EQ-2 kit...

That barlow introduced considerable false-colour, and to an otherwise 100% apochromatic instrument.  The eyepieces are just as bad, the bottom of the barrel, stuck to it even. 

But that's to be expected.  As with all of these entry-level kits, what we're only and really after is the telescope, in the end.

Photo-shoot...

The kit seems rather toy-like there, and here...

Unfortunately, the legs should always be extended to get the telescope up to a suitable height...

It's not the worst in stability, but not that far ahead.

This achromat will make for an excellent terrestrial spotter during the day, and perhaps at night as well; for surveillance.

The OTA...

Only a single scratch was discovered...

That came as no surprise whatsoever, as I've bought from this seller before.  I'm just grateful that that was the only one.

The specifications-label; Meade seems to have always had the prettiest ones...

Those of Celestron are downright spartan...

The objective...

Note the deep plum-like colouration of the doublet's coatings.  Then, we have the green...

...four inches of delectable, luscious, unobstructed, refractive goodness.

I knew even before, prior to purchasing, that this achromat came with a 2" all-metal focusser...

...and with a 1.25" adaptor.  That's the draw-tube racked fully outward, and ideally, short.  There should be no stopping-down of the aperture within this telescope as a result.

The mount...

The yoke is of metal, and quite rigid.  It's rather reminding of a Tele Vue yoke.  The hub to which the yoke attaches is of metal as well.  But the legs, the spreader, and the tray, simply do not equal that above them.  Then, the legs may be upgraded, to something more substantial, of wood perhaps.  The eyepiece tray...

...and exactly the same as the one that came with my Celestron "PowerSeeker" 127EQ.  Interchangeable, they are.

Note where the telescope attaches...

With this type of mount, at this price-point, it helps to add heavy-duty springs, and washers, to where you might be able to omit the slow-motion rod even...

But only if you intend to keep the OTA on that mount.

The un-boxing...

It's so very difficult to source a 102mm f/6 achromat these days; pity, that.  Synta offers one under their "Celestron" marque, the "AstroMaster 102AZ", but with a plastic, wonky, "tongued" focusser, and jepardous for an accurate and precise collimation.  Curiously, however, Synta does not offer one under their "Sky-Watcher" marque; only at f/5 rather, and much too short for the astronomy gods to so bless.

The accoutrements...

...and what was not included within the "Good" kit...

The eyepieces, the barlow and the red-dot finder are like new.  The star-mirror diagonal, however, appears to have been cleaned with a finger and spittle at some point in the past...

That was easy enough to restore, and happily, with no scratches evident...

...but what a cheapie.  Incidentally, I did not pay the extra $25 for those.  I paid it in the hope of hopes that the OTA would be in "excellent" condition, rather.

The "smartphone" adaptor, surprisingly of metal, and with nylon thumb-screws for attachment to an eyepiece...

Perhaps it should've been made of plastic, but not like this Explore Scientific/Bresser adaptor...

In any event, in that I do not own nor use a "smartphone", that'll be about as useful as <insert here> on a boar.

Would that I might alter, modify it, and to work with my point-and-shoots...

I fixed the camera.  It was a thing or other.  Glamour shots...

The contents are not necessarily original to that box.  The kit was a return, to a Costco, a discount, wholesale warehouse, which requires a membership-fee.  Costco then sent the return to Meade, and then Meade sent it to said seller for liquidation...

...a 102mm acxhromat, at f/6; f/5.9 actually, but I made an exception.  We do what we can these days.

I already had one kaleidoscope; this 80mm f/6...

I've never wanted to go shorter than f/6 for an achromat.

Out of the blue, I received in the mail a rebate-check, and tea-totally unexpected.  Imagine my surprise.  Combining that with birthday-cash, I had a modest amount with which to indulge myself, although no splashing on entertainment venues and drink with this windfall, no.

Right next door to California is Arizona, and there in Arizona a seller resides, a liquidator of Meade products, returns and what-not from across the country; waste not, want not, as the saying goes.  The seller has a dedicated website, and an eBay store as well.  On eBay, the seller had only one of these kits, for US$125, and described as being in "Good" condition; just the OTA and a red-dot finder, along with a mount and tripod; no eyepieces, barlow or diagonal, nor a "smartphone" adaptor as when sold new within the retail sector.

But then, on the seller's dedicated website, the same kit was offered, multiples, yet those described as being in "Excellent" condition, and for only $25 more...

Drat!  My world-renowned Minolta DiMage F100 is on the fritz again!

If you are successful in that, the mount's motor(s) and plastic-gears will wear out rather quickly, I expect.  Never overload a plasticky go-to mount, nor one of metal for that matter.  As it is, the 200P on the EQ-5 is right at the limit, if not over.

I've heard of an upturned five-gallon bucket, the tailgate of a pick-up truck, a large tree stump, the bonnet of an automobile(been there and done that with a Zhumell Z100).  There are also fold-up tables used for caravanning.

Some have even mounted the Dobson base onto a tripod, a surveyor's tripod for example.

What you might also consider is doing away with the Dobson base entirely and get a tripod-type alt-azimuth mount, or even an equatorial mount if you want to track objects, and automatically if you motorise the mount's RA-axis.

An 8" aperture collects a considerable amount of light.  Jupiter is one of the brightest objects in the sky, regardless of planetary-opposition.  Barring a magnification of 250x and beyond to dim the planet down, a variable-polariser will otherwise allow you to see the details and subtle colouration on the surface of Jupiter; for example...

https://www.astroshop.eu/moon-filters-polarizing-filters/celestron-filters-variable-grey-filter-1-25-/p,61777

10 hours ago, TonyOwe73242661 said:

Does not the centre of the 'wires' interfere with refractor collimation?

I understood that the wires were for reflector scopes????

The cross-hairs are to help to centre the secondary-mirror directly under the focusser's draw-tube...

Note the "pie slices", nice and even.  Now, my own is actually a simpler sight-tube...

I also use it for the final "home run"...

I also have a Cheshire, for refractors only...

Modern Cheshires include the the cross-hairs of a sight-tube; a combination of the two.

You can see how small the area is within that refractor's scene.  Cross-hairs are not necessary, and might make it difficult to see that small scene clearly.