markse68

Just came back from Munich to find these- 3D printed parts for my scope 😃

Thanks Vlav, I get the wave cancellation bit but it was the “ so it doesn’t reflect in first place” leading to increased transmission that I don’t get. But I think what you’re saying is the wave function cancels so the probability reduces of the photon appearing after the “reflection” and increased probability of it being transmitted? 🤔

Hi Vlav, can you explain the way anti-reflective coating principle works in similar way? The way the photons don’t reflect as they would cancel if they did? I think it’s related and always had me perplexed 🤔 

Any ideas as to what this bizarre looking object could be as imaged by the eROSITA x-Ray telescope in the Large Magellanic Cloud? 

https://www.space.com/german-erosita-x-ray-telescope-first-images.html

Intersting theory Magnus- not sure I get why looking at it further away would make it not a circle but I'm going to bear it in mind and try it next time (hopefully soon) I have to remove my secondary and set it back up again.

I’m afraid I don’t know anything about your issue but might be worth contacting Ron at moonlite- he’s very quick to answer questions and genuinely helpful 👍

On 23/10/2019 at 10:28, johninderby said:

A book and a couple of brass thumbscrews. 

Thanks to the generosity of @Captain Magenta ... snap! 😀 Looking forward to learning lots!

On 10/10/2019 at 15:36, markse68 said:

Just arrived- my new compact 13mm eyepiece... 😂

First light last night- now I really understand the kidney beaning thing 😳 I guess they never intended you to see the field stop AND the rest of the field . Nice view though if you don’t try  to see the full field 😉

Galoc is nice too- bit of distortion at the edge but nice wide view 

Another interesting eyepiece for my odd ep collection 😃

Beautiful sketch Mike- I spent quite a long time last night gazing in wonder at that very feature - it looked like the cornea of a giant eyeball the way it was positioned

Not from me yet but parts for my 2” conversion being printed this week so maybe soon...ish

You can get the Speakons with screw terminals- thought I'd seen them. And they're cheaper

https://uk.rs-online.com/web/p/loudspeaker-connectors/8997390/

https://uk.rs-online.com/web/p/loudspeaker-connectors/3400958/

14 hours ago, msacco said:

I see, that's rather expensive

£10? I guess it's quite expensive but they are great connectors- speakons too

https://uk.rs-online.com/web/p/mains-plugs-sockets/8997387/

1 hour ago, msacco said:

I wasn't able to find any, do you know where I can find these?

My bad- I can only find their high current mains chassis connector- PowerCon with screw terminals- https://www.neutrik.com/en/product/nac3mp-hc

Sorry

25 minutes ago, msacco said:

Edit - So I just notice that the female(i think) of this cable does require soldering

Pretty sure they do screw/faston tab connection versions too

Just arrived- my new compact 13mm eyepiece... 😂

8 hours ago, F15Rules said:

 

Anyone got any further info on this ep, such as field of view, or night time testing? 

 

Just did a comparison and the afov is about the same a a standard plossl. In pic below it’s about the same as the 32mm plossl. It’s a bit smaller than the Tal 25mm- my example of which seems to have an enlarged field stop (and consequent soft focus edges) which matches the Pentax XF ( 60deg afov) but it is a fair bit  bigger than the silly 1.25” 40mm plossl which is more like an ortho afov 🤦‍♂️ So probably the same as a 2” 55mm plossl but shorter more practical eye relief 

Mark

Fov iirc is not huge- maybe a little more than a plossl- will check again when I get home. Am hoping for good sharpness too but need a focuser first....

I do often feel quite vulnerable at my regular viewing site on a common in SE London. Especially when cars slow down to see what I’m up to... There’s a pub nearby and so a steady stream of groups coming and going. I quite often get approached with a “what are you doing- what the [removed word] is that?!?” and at times I’ve been really apprehensive about their approach. But touch wood the usual response after I’ve told them and invited them to have a look at Jupiter or the moon is a genuine thank you and regular hand shakes! Even drugged up yoofs! It turns from fear to a warm feeling inside in an instant. I guess it helps that my scope is and looks exactly like a big piece of plastic drain pipe- not the most theft worthy looking piece of fine optical equipment out there 😉

Probably  the worst thing about the site is the regular passing of emergency vehicles with their intense blue flashing lights that I can’t seem to help but look directly at and then curse my stupidity 🤦‍♂️ And a couple of times I’ve had a police helicopter seemingly take a great deal of interest in what I was up to 😳

Watching with interest- good luck! 🧐

That’s awesome man- glad you saw it too

😊 It is spectacular isn’t it! And to think it should get better and better as the winter months progress- if only we get a few clear nights 😉

what surprised me about the Trapezium was that the stars seemed to have dimension! I don’t know if that’s diffusion from the nebulosity or perhaps my mirrors had dewed  up but I couldn’t focus them to pin points- it’s was like they were smeared a  little bit 🤷‍♂️ 

Anyway, looking forward to many more views in the coming months 😊

Do you think the gearbox needs oiling? 😳😉

You just have to measure the voltage on the middle pin of the pot on the driver board then you can fairly precisely set the current- should be in the data sheet. I’m using the Trinamic chip and it is spec’d in theirs anyway

Have you tried running the 2A motor on 0.4A Astro Geek? It’s probably too low but I think the 2A rating is max cont current- you can run them lower with reduced torque , but cooler and quieter if it’s enough

edit- apologies I should have read the rest of your posts more carefully 🤦‍♂️

“Consequently, the non-geared Nema 17 wasn't man enough to step, so it did need gearing.”

2 minutes ago, Chriske said:

Why nylon..?

It has a nice quality to it that I like- it was a bit more intricate than just a flat spacer and I wanted it to be nice. Filament printing is great for quick tests but I think sls is nicer. I might end up doing it in filament though if I can’t get the price down