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lenscap

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About lenscap

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    Star Forming

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    Birmingham
  1. lenscap

    ST4 and Stellarium ?

    It is a long shot but you could put out want ads for an AstroEQ controller. AstroEQ is similar but less versatile than Onstep but it has been around longer so they come up occasionally. A complete AstroEQ kit with a ready made controller was sold cheap on here in July. AFAIK you cant buy ready-made controllers new any more. I would have bought it myself but I had already ordered the Onstep bits. This is the AstroEQ site; https://www.astroeq.co.uk/tutorials.php
  2. lenscap

    ST4 and Stellarium ?

    Stellarium etc does not control the motors directly. It can communicate ( a two-way process ) with a smart controller to direct the mount to a target using either a LX200 protocol or the mounts Ascom driver. (Since you cannot communicate with a dumb controller like the "enhanced dual axis" you cannot write an Ascom driver for it.) The smart controller "knows" its gear ratios and step angles and calculates how to drive the mount to the target. The "enhanced dual axis" controller has neither the hardware or software to communicate with Stellarium etc. Yes, provided they are stepper motors. The enhanced dual axis motors are described as "DC Motors" Are they steppers? I dont know. I doubt it. Anyway I assume you would not want to use them since you already have steppers on your CG-5.
  3. lenscap

    ST4 and Stellarium ?

    You cannot achieve goto using the enhanced dual drive motor controller. This is a dumb controller. It cannot communicate with Stellarium etc. It cannot know where the scope is pointing. It cannot calculate how to move to a target. It can slew in RA or DEC at various speeds in response to button presses or be remotely moved through the ST4 port (usually for autoguiding), and it can track in RA- thats it. For goto you need a smart controller such as Onstep or AstroEQ or one of the commercial systems which has software which can be used to align the scope, keep track of its position, calculate how to move and, if you wish be used in conjunction with planetarium software. Most telescope controllers are "open-loop" They count stepper-motor steps to determine scope movement. Some have encoders or the option of using encoders (closed-loop control) so that they can keep track of the mount even if it is moved by hand. (Eg SW Freedom Find)
  4. lenscap

    Hi New beginner here!

    Is the adapter fitted the wrong way round? Just wondering if the white end should be screwed onto the focus tube leaving the black part with the thumbscrews to accept the barrel of the star diagonal? If there is damage that stops it fitting properly or being used properly I would take it back.
  5. lenscap

    EQ-1 Motor drive shaft speed ?

    I also have the Sky Scan 2001 version of the EQ3-2. The RA worm ratio is 130;1 and the DEC is 65;1
  6. The Sony DSC-HX1 has a 20X zoom lens that goes up to 560mm focal length. You may get some good astro photos without attaching it to a telescope at all! Here is a review; https://www.dpreview.com/reviews/sonydschx1
  7. lenscap

    Ross Telescope Advice?

    Thanks Ann. That's great. Could you measure the length of the scope (without the eyepiece tube extended) and the diameter of the large lens. Sorry for all the questions, but the info may help someone to identify it.
  8. lenscap

    Ross Telescope Advice?

    Hi Ann and welcome to SGL. Does the scope have any markings such as a date or serial number? Could you post a photo of the scope on the forum?
  9. That would work but when you add shipping & VAT ( and maybe customs duty ?) it would be around £300 as well.
  10. lenscap

    One for any electronics experts

    Have a look at this data sheet. (Scroll down to the table for the NCSU275) http://www.nichia.co.jp/en/product/uvled.html The peak wavelength of the spectrum varies with slight changes to the voltage across the led. So if you wish you can fine tune the peak wavelength. Wire a fixed and a variable resistor in series with the led. Choose the values of the fixed and variable resistors so you can get the lowest & highest led voltages that you want. Then adjust the variable resistor to get the wavelength you need. As Gina says surface-mount components are a pain. Through-hole uv leds are available.
  11. The Instein kit looks very professional. As the old Stella Artois ad used to say, it looks "Reassuringly Expensive" There is an email link at the end of their page. If you inquired they might quote you a price. I have no idea if they sell the control box on its own. instein.eu@gmail.com
  12. I don't know of anyone who sells a ready-made Onstep control box. You could make your own. eg; Take an Arduino Mega 2560 or clone. Plug in a Ramps 1.4 shield or clone. Plug in two DRV8825 stepper drivers. Connect a WeMos D1 Mini wifi module or clone. (4 soldered joints required.) Connect your motors to the Ramps. You will have to fit new connectors. Load the Onstep software. Configure it to suit your hardware. Now you can control the mount by wifi from a Windows laptop using Stellarium or Carte du Ciel etc or, more conveniently, from an Android phone /tab using the Onstep app & Sky Safari plus or pro.
  13. Alongside each sketch in TLAO for a Star Diagonal which (usually) has North up, there is a corresponding sketch for a Dobsonian scope (like the Heritage 130p) which is (usually) South up.
  14. Since we know your motors & gear trains are capable of tracking precision & usable goto slew rates they will be fine for Onstep. You will need to find your worm & gear ratios & motor step angles & operating voltages but this info is readily available or easy to measure. The Onstep Android app allows you to align & configure the system from a phone/tab and has lists of goto targets. You can also use it with an app like sky safari for planetarium style control. I chose the cheap/easy Arduino option and no board or component cost more than a fiver (I used clones whenever possible) so if something eventually fails I will just plug in a replacement. I've just built a system for my EQ3-2 but everything is configurable so if I upgrade to an EQ5 I'll just change the gear ratios in the software and it will drive that.
  15. Are you up for some DIY electronics? (Almost no soldering required.) If so you could retain your motors/gears etc and make an Onstep goto controller with wifi using your mobile as a handset for less than £50. https://groups.io/g/onstep/wiki/home
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