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Messages - monsresiwor

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Its a great planetary scope but only 125 I dont think its out of collimation but a 125 will only give 150x generally so your eyepieces are fine DONT SPEND MORE get a bigger scope

Thatsin the plan

2
Beginners Forum / Re: Help with constellations
« on: February 09, 2018, 07:16:43 AM »
Ed,

Can you set the "speed" to specific values, particularly one day?

If you can do that, then what can be done is to set Stellarium to your "usual" observing time, say 11 pm. Then set the "speed" to one day, and you see the sky at the same time of evening (11 pm) on successive days. That way you can see the effect of the seasons, e.g. watch the Orion constellation rise in the east lying on its side around early November, move to the meridian tilting upright and then fall out of the western sky in spring. On a shorter time scale you can see how the moon's position changes from night to night for the 11 pm observing time. I found that to be very useful in understanding the sky motions over the seasons, which is not really possible to observe in "real time".

If the "speed" is set to some small value like one minute or one hour, then you can similarly watch how the stars move over the course of a single night. Especially useful to see how they "tilt", e.g. in November Orion will follow the course just described over a single night, tilting from one side to the other. Another one useful to look at over a single night is to center Polaris and watch the northern stars rotate around it over the night. For single night motion no need to set to any particular value (whereas you need to set it to one day to see night-to-night changes for a fixed 11 pm observing time).

3
Beginners Forum / Re: Beginner telescope for novice with kids
« on: February 09, 2018, 05:40:03 AM »
I am new to this hobby as well. I initial interest was to get my 8 year old daughter involved as she has shown an interest. My budget was about 1k. My older brother had an 8" reflector and told me to look at the Celestron 8se with the go to tracking.

I found a used scope on craigslist and was able to purchase a new eyepiece and Barlow lens and I am still under 1k. This has been a great purchase for me, I can have it setup and trackingnow in 10 minutes flat. As far as buying a used scope, I don't know what to say except I may have been lucky to find one in great condition. A new one would have set me back over 1k plus extras.

I love this scope; its easy to use, fairly compact, not heavy, quick to setup. I don't know about taking photos with it in fact the seller whom I purchased the scope from was selling it because he had purchased a newer larger scope for taking photos. I am sure there are others posting here that can provide better information.

I live in So Cal where light pollution is a fact of life...even with bad pollution I have had my best viewing from my own backyard. For instance last night I was able to immediately after dinner take it to the yard, plug it in, enter the date and time, point to 3 bright objects and it was ready to go. I have no idea which objects I aligned it to and it did not matter. Had it slew to Jupiter and was able to see its cloud bands, its moons and even a moon shadow. I invested 10 minutes with setup and 30 minutes with my daughter checking it out before bedtime. I feel foolish for not having it sooner. I am pretty sure I enjoy it more than my daughter...I have a feeling she is not as impressed as me.

Good luck
Bill

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In the early 60's our family made a trip to Glacier National Park to see the glorious glaciers that had been there for 10's of thousands of years. In the last 50 years they have disappeared. They are gone and will never be back. Think about that for awhile.

Not true! There's still at least 25 glaciers remaining in the park.

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Well I disabled all the WiFi/client handling code and it made no significant difference. Without a proper signal generator, I don't have a means of actual measuring changes like that.

Doing some research shows that I should be able to come up with a poor mans signal generator using an Arduino/etc to generate two PWM signals 90deg out of phase. I probably wouldn't be able to change the frequency very well, but could easily emulate a constant rotation speed of the encoder. Not sure how easy to do this is yet. Would be nice to be able to to get an accurate measure of accuracy without relying on a digitalRead() (which I believe to be fast, but still a lot slower then flipping a boolean).

The other thing I'm looking into is using something like a pair of ATTiny84 to process the encoders. I think one should be able to keep up with a single 10K encoder.  I have some old Arduino Uno's which are basically the same chip, but just have more pins so I could do a test. Nice thing about them is that they're only $1/ea vs the $5 US Digital wants for their encoder counter chips.

Or use two ESP8266's and each one only handles a single encoder and they communicate via serial. That should work as long as one of them still has enough power to handle WiFi.

Or wait a while for the new ESP32 which is a more powerful dual-core wifi/bluetooth solution to stabilize.

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General Astronomy & Observing / Re: UAP - are they real?
« on: February 08, 2018, 07:18:10 PM »
Not saying their are no aliens, statistically more than likely the universe is full of life. What I don’t buy is traveling the distance and time span involved is very unlikely.

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Eyepieces Questions & Recommendations / Re: Cheap " O-III filter?
« on: February 08, 2018, 01:54:38 AM »
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One more vote for the Celestron. It is made by Baader and benefit from their excellent thin cell (help to avoid vignetting when used with eyepiece with max field stop in a given barrel).

Yes, but the Baader is 10nm, the Celestron is 8.5nm

It doesn't seem to be much written down from 8.5nm to 10nm, but it makes a HUGE difference.

I've tried the Celestron in 10 and 12 inch telescopes and it works good only if your exit pupil is 7mm. Anything under 7mm and it is far too dim. I would NOT recommend it.

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Beginners Forum / Re: First Time at "Dark" Site
« on: February 02, 2018, 08:07:14 PM »
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Darker. A LOT darker. Worth the trip.


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25 miles south of Atlanta and the weather/skies have been great. I probably shouldn't have said that as it usually brings clouds. Sorry guys and gals.

Another great night here too in NC. The whole week has been great: New moon tonight and will be out DSO hunting.

10
Beginners Forum / Re: Doomed newbie
« on: January 31, 2018, 11:58:48 AM »
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<snip>

<snip>

Thanks, Dave, that is very good to know. And yes, by "right over my house" I do mean that I will be smack in the middle of the path of totality. I might bring out my telescope after all, if I can take a quick peek without a solar filter (I don't have one). I'll keep a very, very sharp eye on the time though. I hope those eclipse timer apps are accurate.

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Beginners Forum / Re: Finally purchasing! 12 inch Skywatcher
« on: January 31, 2018, 05:18:48 AM »
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I've had a 10" dob for a couple of years now and have really liked it. Very simple and fun to use. I did build a cart that helps a lot with getting it out of the house. The telescope is not super heavy, but awkward to carry, and the cart lets me go out in one trip. It's also got a wooden riser that brings the eyepiece up to eye level when I use it, or can be removed and used as a stool for kids.

Dobsonian Cart by Brian Wilson, on Flickr

Nice cart, is that Styrofoam on the back of it to keep it stable?


12
I wish the sea level would rise, maybe I could use my sailboat more as half the time it's on the bottom as getting dredging permits seems to take an act of God. A foot would be nice.

Seriously, this last summer was mild compared to many in the past. I can remember much hotter Summer's back in the 1970s where we had weeks on end with 100 degree plus weather here. I have no doubt cities are get warmer as they keep getting larger, more concrete and asphalt, more AC pumping out heat. Not scientific, but my wife was born here in Florida and grew up without AC until she was 16 years old. Said it was always pleasant until the small town she lived in had a building boom. Just never cooled down as much at night after that. We now live in the country, no asphalt roads nearby etc. 12 miles east of a small town of around 10,000. We are consistently 4 degrees cooler at night and in the morning than that small town. Just an observation....

13
Eyepieces Questions & Recommendations / Re: new TV Delite 3mm
« on: January 31, 2018, 02:01:18 AM »
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That 3mm Delite would be one of my most eyepieces in my seeing. Coma won't be much of a problem at that high power. A perfect 6" mirror should do 400x easy.

I doubt that any 6" obstructed scope will go to 400x on a regular basis.
Yes one can get the magnification but I doubt there will be any benefit to the image quality or detail, a highly magnified mushy image would be the likely result.
A 3mm in the OPs scope will give an exit pupil of 0.6mm at 250x and a TF of 0.248º.
At that power seeing will be more of an issue than coma.

14
ATM, Optics and DIY Forum / Re: Eyepiece size standards ?
« on: January 31, 2018, 01:59:19 AM »
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1.252" may be a very tight fit in some focusers..
Jon

I still have it, not quite finished it yet. What would you suggest ?
I am not a machinist, just an engineer-researcher who measures stuff and designs stuff. And I don't have a 2 inch micrometer at home, just calipers. But I measure TeleVue barrels at about 0.005" to 0.003" under (1.245"-1.247"). Usually 0.001"-0.002" is considered a slip fit which is not what you want. You want an easy fit.

Jon

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Mounts Questions & Expirience / Re: Cone Error procedure order?
« on: January 31, 2018, 12:44:04 AM »
Perhaps this article will help.

https://www.cloudyni...procedure-r2447

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