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Celestron C5 Registry

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#226 CHASLX200

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Posted 01 September 2018 - 04:26 PM

The motor years just tell when the motors are made. Not sure how that relates to the age of the scope other than the scope was made after the motors. Celestron could have purchased 100,000 motors in 1975 and were still using them from that pile in 1982. Please correct me if I'm wrong.

It don't. Them motors could have been sitting around years before the scope was made.



#227 whizbang

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Posted 02 September 2018 - 12:37 PM

I am really enjoying the C5 I picked up back in June of this year.  The Serial Number is 1 2715 7.

 

Here the orange tube C5 next to a newer Orion 127 Mak.  I was concerned that older optical surfaces and 40 years of oxidation would have compromised the C5's views.  My fears were unwarranted.  In side-by-side testing, the views of planets, DSO's and double stars were basically identical.  Additionally, the wedge/fork was rock solid, lighter weight, and more intuitive to operate than the GEM mounted Mak.  I am a happy camper.

 

OrionCelestron.jpg

 


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#228 Masvingo

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Posted 20 October 2018 - 09:20 AM

Many thanks to Ron Luxemburg, nrcapes, Dr Zarkov and whizbang for the serial numbers and other details of their C5s which I’ve now added to the C5 Registry and bumped it to the 7th Edition.  As usual, the new entries are highlighted in blue and to keep the file size down I've only shown an image of the top part of the list in the image below, however the orange link above will take you to a jpg of the full version.

 

Dr Zarkov’s C5, serial # 2 3902 8, indicates that it was only sometime during or after the 2nd quarter in 1978 that Celestron changed from their ‘Q nnnn Y’ format (where Q = the quarter of production, nnnn = a sequential production number and Y = the last digit of the year of production) to a temporary format before they abandoned any date indication and changed to the ‘5nnnnn’ format (where 5 = C5 and nnnnn = a sequential production number).

 

It looks like the temporary format may have just dropped Q the quarter indicator to become ‘nnnn Y’ with nnnn, the sequential production number continuing in sequence from the old format before it was re-zeroed when the ‘5nnnnn’ format came in as we now have in the Registry two 1st quarter 1978 C5s, # 1 3585 8 and # 136588, then Dr Zarkov’s 2nd quarter C5 with # 2 3902 8 and then 4 C5s with the new temporary format, # 4165 8, 4190 8 and 4311 8 all in 1978 and # 4350 9 in 1979 which gives the following sequence of production numbers: 3585; 3658; 3902; 4165; 4190; 4311 and 4350. 

 

With regard to motor numbers, whilst Don is right in that when looking at a single C5 in isolation, the motor date only gives the earliest date that the scope could have been made (assuming of course that the motors haven’t been replaced at some later stage) because Celestron could have purchased 100,000 motors in 1975 and be still using them for scopes produced in 1982, this is where I think there is value in recording the motor dates along with the serial numbers as it then gives an idea of how quickly Celestron’s stock of motors was turned over. 

 

Unfortunately, when we get to the scopes produced after 1979 which have serial numbers with no date indicators we don’t really have much to go on other than motor dates and the odd data point provided by a scope that has a verified purchase date (and even then there is no telling how long it might have sat in the dealer’s stock). 

 

As ever, all contributions, clarifications and corrections gratefully received and remember – we love pictures too (and they help to detail the smaller changes over the years such as whether phillips or hex head screws were used for the secondary adjustment.)

 

James

c5serialv7.jpg


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#229 whizbang

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Posted 22 October 2018 - 09:39 AM

I'm curious to know about the small bases.

 

My C5 fork (1 2715 7) has the same eight inch diameter as my C8.

 

Did Celestron go back and forth with large and small bases?  Or did they start with small bases, then permanently  switch to large at some point?


Edited by whizbang, 22 October 2018 - 09:41 AM.


#230 davidmcgo

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Posted 22 October 2018 - 11:45 AM

They started with small and changed when they went to die cast to the same base as the C8.

 

Dave



#231 CHASLX200

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Posted 22 October 2018 - 06:06 PM

They changed around late 1976 to 77 from the small to the bigger base.



#232 iampivot

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Posted 24 October 2018 - 01:09 AM

Here's my uncles C5 serial; Looks like a 1971 model?

 

IMG_20181024_115516.jpg



#233 CHASLX200

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Posted 24 October 2018 - 05:12 AM

Here's my uncles C5 serial; Looks like a 1971 model?

 

attachicon.gif IMG_20181024_115516.jpg

That 2ndary cap look like it was made around 1980.  The first run C5's had a smooth finish.



#234 rolo

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Posted 24 October 2018 - 06:46 AM

71 had an aluminium secondary housing. Doesn't really matter cant date it anyway... 



#235 Masvingo

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Posted 24 October 2018 - 04:19 PM

I would agree with Chas, 1980.  As far as I can tell, the 5xxxxx format serial numbers started to be used in 1979 and do not indicate the date of manufacture at all - the 5 signifies a C5 and the remaining 5 digits are a sequential production number so your uncle's scope is the 1071st one made since the 5xxxxx format was introduced in 1979.

 

Looking at the Registry, serial # 500895 has motors dated Nov 1979 and can't have been made earlier than Nov 79 whilst serial 501610 has motors dated April 1980 and can't have been made earlier than April 1980. Serial 502525 has Oct 1980 motors which suggests the motor stock was turned over fairly quickly and suggests that your uncle's scope was probably produced early 1980 or possibly at the end of 1979.  But it's all a bit of guesswork with this serial number format.

 

James


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#236 iampivot

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Posted 24 October 2018 - 07:22 PM

Ok, here's a photo of the finish, if that pinpoints it a bit better. Doesn't look like there's any serial on the mount/motor.

 

IMG_20181024_222648.jpg

 

IMG_20181024_222705.jpg


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#237 iampivot

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Posted 24 October 2018 - 07:24 PM

Base of mount.

 

IMG_20181024_222738.jpg

 

 



#238 CHASLX200

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Posted 24 October 2018 - 07:29 PM

That is the later version with the bigger base.



#239 Masvingo

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Posted 25 October 2018 - 07:24 AM

As Dave has noted in post 230 above, the C5 base size changed to the larger size at the time the mount changed from being sand cast (holes in the fork arms) to die cast (solid fork arms).  Essentially, Celestron rationalised production by using the C8 base for the C5 as well.  There is usually only one serial number on a C5/C8 - on the earlier scopes it was on the base (unless sold as an OTA only) whereas for later scopes it moved to the OTA being located on the secondary housing.

 

Motor dates can be hard to see sometimes without removing a motor as depending on exactly where it is stamped on the circumference of the motor it may be hidden from view when the motors are installed.  The picture shows the date '4 81' (April 1981) on one of the motors of my C5 serial 502612.

 

C5 motor.jpg


Edited by Masvingo, 25 October 2018 - 11:50 AM.

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#240 iampivot

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Posted 26 October 2018 - 11:05 AM

It's really hard to get a photo of these numbers without dismantling the base. I don't think any of the numbers shown in these photos are the relevant ones?

 

IMG_20181027_004529.jpg IMG_20181027_004933.jpg



#241 Max Lattanzi

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Posted 29 October 2018 - 02:11 PM

Hi Everyone...!

 

So, after awaiting for just a few decades... the telescope I was after as a kid magically materialized in the form of a cute blue trunk.

 

(...for you based in the US might have been a more common item, but AFAIK there were NONE sold in Italy at that time...

 

...not to mention that getting one from the US is not exactly a piece of cake, given the good number of local CN fellows hunting around... ;-)

 

 

Attached Thumbnails

  • C5 Sandcast #1 1926 6 Trunk IMG_20181018_151951 CN.jpg

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#242 Max Lattanzi

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Posted 29 October 2018 - 02:13 PM

Anyhow, here it is: finally a nice and complete C5 Sandcast of the beginning of 1976 (...exactly when I was perusing the first Italian Celestron Catalogue..) is here in the Dolce Belpaese...!

 

C5 Sandcast #1 1926 6 Profile IMG_20181018_151544 CN.jpg


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#243 Max Lattanzi

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Posted 29 October 2018 - 02:14 PM

Front side. Schmidt plate was all fogged due to the evaporation of the inside lubricant -- the mechanicals were indeed DRY.

 

Thanks God both primary and secondary mirror are in excellent shape -- as the plate, that cleaned just beautifully.

 

It has a 5x24 finder (not pictured) and  a brass disc cover for access to the gear box.
Came with K25, K12, K9 and a *very nice* OR4 -- All of them 0.965" and marked Celestron.

 

And, yes, the wedge is the correct one!

 

C5 Sandcast #1 1926 6 Front IMG_20181018_151705 CN.jpg


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#244 Max Lattanzi

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Posted 29 October 2018 - 02:16 PM

Now, since James is already awaiting for it like a flying ace, here is the plaquette with the serial # 1 1926 6

 

Very beginning of 1976. Which is confirmed by the motors (not pictured), that are dated December 1975 (12/75)

 

C5 Sandcast #1 1926 6 Serial # IMG_20181028_190035 CN.jpg


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#245 Max Lattanzi

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Posted 29 October 2018 - 02:19 PM

So, since the Schmidt plate was severely fogged and the focusing mechanism stuck, I had to pen up the whole thing.

Thus I can give you further info form inside.

 

Back of the mirror -- at those times they really wanted to let you understand it was hand-optimised...!

 

T 248 -- I have no idea. Anyone...?!

2706 opposite to the focuser corresponds both in figure and position to the orientation of the Schmidt plate (which has the same serial at 3 o'clock).
The vertical thick band pointing down at about 6:30 corresponds to an equally think mark on the edge of the plate still at 6:30 position.

 

So, everything is original and untouched. And monkey-proof as per the correct orientation. Which is always great.

 

Ah, the whole mechanism regrased beautifully and now it is silky smooth.

 

As usual, not a single piece of plastic anywhere in the whole instrument. Good old times...

 

C5 Sandcast #1 1926 6 back mirror IMG_20181028_185906 CN.jpg


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#246 Max Lattanzi

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Posted 29 October 2018 - 02:22 PM

Inside the OTA no further serials (I had found two in my other die-cast, but not here).

 

C5 Sandcast #1 1926 6 Inside rear cell IMG_20181028_190734 CN.jpg


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#247 Max Lattanzi

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Posted 29 October 2018 - 02:25 PM

The serial on the Schmidt Plate, as said # 2706 (as behind the main mirror) -- doubled by the glass reflection).

 

C5 Sandcast #1 1926 6 Serialized Plate IMG_20181028_190438_699 CN.jpg

 

So, here you go with the summary:

 

Sandcast C5 (with correct wedge ;-)
Serial # 1 1926 6
Motors 12 / 75
Main mirror serial # 2706 (plus T248)
Schmidt plate corresponding serial # 2706
Correct alignment marks.

PS/ Incidentally, the instrument came without powercord. At present is sharing the same of a sandcast C8.

 

Anyone has a spare or can point me towards one?

Or, alas, the components to make one?

 

Many thanks in advance

-- Max


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#248 Max Lattanzi

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Posted 29 October 2018 - 02:27 PM

@ James

 

I was checking the registry and saw you put my other C5 # 4 3359 7 (end of 1977) within the list of those having the 6 1/2" base, just being pebbled.

While mine actually uses the same die cast base of the C8.

 

So, together with others (?) you may wish to move it at the beginning of the next series (die cast 8" dia.), which obviously started somewhere in 1977 and not at the beginning of 1978.

Just a hint.

 

Cheers,

-- Max

 

PS/ My original post about it is at https://www.cloudyni...stry/?p=6861495


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#249 Max Lattanzi

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Posted 29 October 2018 - 02:28 PM

@ James #2

 

I just noticed that Albert1 rescued in February 2016 a beautiful sandcast with serial # 1 1918 6 -- only 8 numbers apart!
https://www.cloudyni...stry/?p=7067939

 

They indeed look twins...!

Very cool cool.gif


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#250 solar1999

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Posted 29 October 2018 - 07:37 PM

Great photos of a work of art!

Maybe the T number is the "polishing tool number" used to finish mirror (to keep track of potential quality issues when the mirrors were mass produced.???)

 

Cables can be found ebay:

Xerox 117p80152 PH163 AC Power Cord Circle 3 Pin PH-163,18/3 SVT Vintage NOS New

 

https://www.ebay.com...=item4d60af74ed




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