Recently Browsing 0 members
No registered users viewing this page.
By Roy Challen
My Dad has asked me to sell this lovely Tal 100R on his behalf, I hope this is not against the forum rules. I owned this scope before him, and the condition is as it was when I had it. There are a few chips in the paint and some very small marks on the objective. There is a scratch on the inner surface of the dew shield which creates a horrible reflection on the objective, however this is not visible when observing. It comes with the original diagonal, mount, tripod and box, but no eyepieces. I do have some Tal plossls of a later vintage that could be added to make a complete package if desired. I fitted the SkyWatcher spreader plate/accessory tray as it was much better than the original, but does take away from its originality.
I'm asking £200 and collection will have to be from Watford as it is a heavy item. The link at the bottom is to my first and second light reports of this scope. It sounds a little negative but that's only because the RS is that little bit better.
If you have any questions or need additional photos, just ask.
As I am hopeless with DIY, give me a car, bike home electrics or plumbing I`m fine anything else I am rubbish. Well bought this ironing chair second hand from Ebay £9.98 came in bubble wrap on inspecting it the back is cracked and broken. For the price I am not bothered about that but could you kind people give me some ideas as to how replace it please.
I'm umming and arring over whether to get a solar filter or the solar wedge. I have read a couple of of things about the wedge both saying I would need a filter as well and if I buy the 1.25" I don't think it will fit in the Tal 100rs the 2 " is way out of my price range so any help much appreciated.
I've been whiling away my shipping wait for my hardware by watching and reading about Arduino and Stepper Motor control (Specifically). I was watching one rather informative video where the author hit on another library for the Arduino, AccelStepper.
It appears to be a bit simpler than regular Arduino coding, which was attractive to me. But what really brought me running was that it can accelerate and decelerate on either end of the command. Think of it being a Soft Start for a stepper motor running your focuser, or a Filter Wheel. Soft Start?
Yes, a Soft Start, and also a Soft Stop. Making your stepper motor gently begin to move, traveling to your selected point, then slowing the travel so it coasts in to what you requested. Soft Start is becoming quite common for a lot of motor driven devices.
So my thoughts on it were to program my upcoming Arduino projects with my own Soft Start and Soft Stop to bring the focuser to Step XXX and when trying to toy in a best focus, the automatic Soft Start could aid in getting gentler adjustments.
I bounced this idea off of my friend and he said that ramping speed was more for CNC machines and the like. And that tweaking in a focuser was more like around 70 steps to get the human eye to see the difference. I don't know (yet), but it seemed to me making any command gentler on the overall equipment might be a better idea.
Arduino (I've been led to believe) doesn't have this Soft Start - Soft Stop in their library yet. If you would like, Here are the links to this idea:
The Maker Show by Bret Stateham. If you scroll down on this page, there are quick links to the different parts he covers, including the AccelStepper part.
Quick Link to the AccellStepper Part. Or a bit before, where he refers to the Library, and where this software will be if you choose to download it for your Arduino Programming. I did, so it is there when I get my hardware here and actually begin my developing. (I prefer to have things in front of me as I prototype. I'm a hands on kinda guy.)
I searched to see if this had been posted here, but found nothing. So I thought I'd offer it up to anyone who might be interested. OK, back to hammering on my brain. (Think: A BB in a Boxcar.)