Celestron Unified (6.1.7350, Feb 2020) Telescope & Focuser. Installs a driver for all computerized Celestron telescopes, now including the new Celestron Focuser. NOTE: Focuser moves are prevented if the focuser is not calibrated. Calibrate the Focuser before anything else! Also this driver does its best to compensate for the extra time needed. Hello MartoniansI have finished the tripod, and I want to clean up the finderscope,corrector and primarry mirror. With this done I can test out the optics.

Vintage Celestron C8 Telescope With Tripod Stand and Tons of Lenses Accessories. $150.00 shipping. Ending May 19 at 5:04PM PDT 7d 17h. Celestron NexStar 8SE Telescope. 4.5 out of 5 stars (29) 29 product ratings - Celestron NexStar 8SE Telescope. Celestron’s award-winning Nature DX binocular gets a major upgrade with the addition of ED objective lenses. NEW: Elements ThermoTank 3 On the trail, at the job site, in the classroom, or simply sitting at home relaxing – the Celestron Elements ThermoTank 3 will keep your hands toasty.

Hello,
I recently purchased 8 MAX31855 breakout boards from Adafruit to read K-type thermocouples (not from Adafruit) over Serial to a PC as per your excellent tutorial. I even tried it installed with the 0.1uF capacitors. Here is the problem: I can read temperatures from one board just fine (mostly) using the Arduino 'serial test' example code and library files available from Github. Every once in a while, I will get a 'nan' slipped in there (I removed the if statement to see everything returned by the library calls printed to terminal instead of the error message). Anyways, that is mostly okay.
The real problem arises when I attempt to modify the arduino code and connections to read more than one board simultaneously. I will get good data returned for all boards 5 times in a row. After that, they all return nan consistently. If I unplug the power from the boards, and then plug it back in, I get 5 more good data points before returning to nan's.
Here's part of the arduino code, and the boards are all wired up according to the pin assignments in the code.
#include 'Adafruit_MAX31855.h'
int thermoData1 = 2;
int CLK1 = 3;
int CS1 = 4;
int thermoData2 = 5;
int CLK2 = 6;
int CS2 = 7;
int thermoData3 = 8;
int CLK3 = 9;
int CS3 = 10;
Adafruit_MAX31855 thermocouple1(CLK1, CS1, thermoData1);
Adafruit_MAX31855 thermocouple2(CLK2, CS2, thermoData2);
Adafruit_MAX31855 thermocouple3(CLK3, CS3, thermoData3);
.
.
.
In the FAQ section of the tutorial, it says that you can connect and read from multiple boards by sharing CLK and DO pins and using a different CS for each board. This doesn't make any sense to me, why if you wanted 8 different inputs you would send them all to the same pin... Regardless, I tried it as in the code above with only 3 boards and assigned pins such that each got a dedicated CS, CLK, and DO port with no joy.
Also, I have tested all 8 thermocouples with a separate reader from Omega, and they are working fine. Everything is soldered, so the connections are solid. Any advice is appreciated! Also, if anyone has some suggestions about how to remove those annoying 'nan' returns that pop up randomly from a single thermocouple read that would help a bunch too :D . Thanks in advance for the help!CELESTRON 8” SCT: STANDARD OR METRIC?
Special Note: The Celestron SCT uses either standard 6-32 or metric M3 collimation screws. It is important to order the correct knobs for your telescope. Allen and set-style factory collimation screws have standard threads. For Phillips collimation screws, the general rule is: Silver are standard; Black are metric. There are exceptions to this rule for black Phillips screws, so we have developed some hints to help you to determine which type of black Phillips collimation screw your telescope uses. Moreover, there are even exceptions to the hints, so if you are unsure of the type of screw in your telescope, you can either 1) pull a single collimation screw and check its threads using the guidelines at the bottom of this page; or 2) order both standard and metric knobs and return those that aren’t needed for a full refund.
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Example 1: Black Phillips Collimation Screws
Textured secondary surface with serial number sticker and “CELESTRON” imprint in upper case lettering. Collimation screws are surrounded by a thin ring of smooth plastic and are slightly countersunk into the secondary housing. This is the most common black Phillips configuration.
Type of collimation screw: Metric
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Celestron C8 Serial Numbers

Example 2: Black Phillips Collimation Screws
Textured secondary surface with serial number sticker and 'Celestron' imprint in upper and lower case lettering. Collimation screws are surrounded by normal surface texturing and are not countersunk.
Type of collimation screw: Standard
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Example 3: Black Phillips Collimation Screws
Nearly smooth secondary surface with serial number sticker but no “Celestron” imprint. Screws are slightly countersunk.

Celestron Super C8 Manual

Type of collimation screw: Can be either Standard or Metric
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Example 4: Black Phillips Collimation Screws
Smooth secondary surface with serial number sticker and “CELESTRON” imprint in upper case lettering. Screws are slightly countersunk.
Type of collimation screw: Can be either Standard or Metric
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Example 5: Black Phillips Collimation Screws
Fastar secondary with label. Scope can be either with or without EdgeHD optics. (Note: EdgeHD and non-EdgeHD require different knobs.)
Type of collimation screw: Metric
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Example 6: Black Phillips Collimation Screws
Hyperstar compatible secondary. Collimation screws are deeply countersunk into the secondary housing.
Type of collimation screw:

Celestron Starsense Manual

Metric
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Celestron Classic 8 Telescope Manual

If you decide to remove a Celestron 8” SCT collimation screw, here's how to determine if the screw has standard or metric threads. (Our knobs are shown in the photograph.) Both factory screws have about the same thread length below the screw head. The metric screw is slightly smaller in diameter, but that isn't really helpful without having samples of both screws. The best way to determine screw type is to count threads. The standard screw has about 10 thread turns over its 5/16 inch length, and the metric screw has about 16 thread turns over its 8 mm length. (Exception: The C8 EdgeHD with black Phillips collimation screws and the Fastar secondary has a longer 12 mm black Phillips secondary collimation screw. This screw is metric with 24 thread turns over its length.)
Please contact us using the link below for guidance if you have further questions.