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Messages - salonpeli

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1
Reflectors Telescopes Forum / Re: Off axis mask experiences
« on: February 09, 2018, 04:30:06 AM »
Weather continues to be a problem, and forecast doesn't look any better for the next few days. Getting anxious to get out there to give it a try! Some people just love to see Spring, not so much here.

2
as for gear ... binoculars only, if that. don't bother with a camera -- there will be people taking photos that will turn out many times better than anything you can do (unless you're one of those people).

it's only going to be 2+ minutes, and based on my experience with the near 7 minute baja eclipse in the 1990s, it takes you a minute or two just to get centered on the reality of the spectacle.

3
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If you start the car, the starter will suck a lot of current and cause a brownout. e.g. does your car stereo cut out when you crank the engine? if so, then your mount will not like that either!

Many modern cars have a stop-start system and a much beefier battery. At least on my current vehicle, starting the engine does not interrupt the stereo or anything connected to the lighter plug.
It's not just a brownout -- it's wiring. Some cars disconnect most of the electrical system while the engine is starting, so the starter will get all the power. Others, as you point out, don't.

4
I hear you on Sedona, but when you look at a typical urban area it takes a LOT of square miles to have the urban amenities that are packed into a tourist community like Sedona. You would drive a lot of miles to get the variety in Phoenix.

Talking to Forest Service employees the best weather is San Diego and the central California coast. Followed by higher elevation Arizona communities and communites like Silver City, NM.

Sierra Vista is cheaper than Flagstaff. No snow in winter. It is a hour or more from Tucson and you do have to cross the INTERNAL BORDER CONTROL points to go anywhere. I hate them. Makes me feel like I am back in the Soviet Union.

The perfect temperature out west, due to low humidity, is 85 degrees. That is shorts and t-shirt weather. When you get in the mid-90's and up is what I would consider hot. But then again, living in Boulder City, Nevada I could tell the difference between 115 and a cooling trend when the temperature dropped to 110.

5
Yes, I see two problems if I deepen the arc into the base.

1) The OTA would definitely bottom out, which would require me to move the OTA farther up into the rings and place an even heavier counterweight at the bottom end of the tube to compensate. I don't want to make the telescope heavier than it already is with the current counterweight setup.

2) The base itself would be weakened and become less stable. It might even be shakier when I'm observing with the mount.

I don't want to make any further changes to this Dob mount. Possibly I might buy a new Dob mount for the 10" Newt OTA that doesn't have the problems this one has. In general, I want to know what to look for when I buy a separate Dob mount or a complete Dob system. (I'm thinking about buying a 14" or so Dob.)

I'm not an ATMer. I'm not a DIYer beyond rigging up simple fixes, flocking OTAs, and such.

Mike

6
General Astronomy & Observing / Re: Messier 1 Sensitive to LP?
« on: February 03, 2018, 04:37:35 AM »
Wow some great info here. I felt like an idiot when I couldn't even find the 1st Messier object M1. I feel better knowing others have this problem too.

7
ATM, Optics and DIY Forum / Re: Polishing a 6" f8
« on: February 03, 2018, 02:19:50 AM »
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How much polishing time do you get before you have to re-channel?


It varies. The deeper you push the mesh in, the deeper the channels. You have to pull off the mesh before it cools or you may break off facets. With the temperature about 79F using Gugolz #64 it lasts about 2-3 hours before the center channels get too shallow. The last time I pressed the mesh a bit deeper and it seems to be holding up well after 2 hours. Before I press the mesh, I wire brush the old surface and then again after cold pressing. Then I don't bother brushing it until I need to repress the mesh. I have no idea whether frequent brushing would help, but I don't need to for smooth action.

I think I'm polished out now. I need to finish my test stand and built a Foucault tester. I'm curious about smoothness.

Carl

8
Reflectors Telescopes Forum / Re: New Moon Telescope 8" Hybrid
« on: January 31, 2018, 01:30:36 PM »
Finally had several clear nights with good seeing and I have to say I'm really loving this scope.  The mirror is just amazing and the build quality of the scope makes it a total joy to use. The mirror is easy to cool, the motions are really smooth and it holds collimation really well.

Just got through viewing Saturn at 450X and the image was the best I've seen. This is definitely the best planetary scope I've used. Every bit as good as my refractors with more horsepower.  I'm truly amazed what a well made 8 inch reflector with an outstanding mirror can show. This thing might convert some refractor fans.

9
Beginners Forum / Re: Greetings! Advice on first telescope please?
« on: January 31, 2018, 11:06:51 AM »
Here is the problem though. He wants a visual scope that he could also use to dabble with AP. A 70mm refractor is not really a visual scope. The 90mm is a decent size for a portable visual scope, and certainly not a bad size for AP, although maybe not ideal for a beginner. So if you are saying the 90mm raptor has too much FL for dabbling in AP, what you are really saying is he needs two scopes, one for visual and the 70mm for AP. (Not that we've never heard THAT before.)

Scott

10
Reflectors Telescopes Forum / Re: Waiting time for custom mirrors
« on: January 31, 2018, 09:53:02 AM »
When I ordered my mirror eleven years ago the optician told me a year. I had communicated that I would really like to have it in time for a star party that was a year away and the mirror was delivered as promised. I paid 50% up front and the rest at completion. I think maybe you made a mistake paying too much up front to the glass pusher. If they're strapped for cash what better incentive is there to get him to deliver the mirror. Since he already has most of your dough what's the hurry? For him.

11
Mounts Questions & Expirience / Re: Skywatcher EQ6-R Pro Equatorial Mount
« on: January 31, 2018, 08:46:08 AM »
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I've had one for a few weeks now - I love it.
The belt drive is very quiet, and the handle is very useful.
I use Polemaster for polar alignment and it holds PA rock solid.
EQMOD can control it direct without the handset, via planetarium such a Stellarium.

John

Hey John how did you connect your PC (like mine is USB3/2 only not RS232) to this mount?

12
Mounts Questions & Expirience / Re: EQ8 vs CGX-L
« on: January 31, 2018, 08:11:04 AM »
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My main criteria chosing between these mounts would be mechanical specs and capabilities. Though I have never used them so I don't have any recommendation that I can give. But being both Synta products I guess they have similar quality and accuracy.

My experience is that the Celestron mounts have better goto/pointing accuracy. I can't explain it but there it is, every time.

Yes but that is better because of the hand controller not because of the mount itself. If EQMOD/CDC is used both mounts would be similar in star alignment.

Andpolar alignment can be done with Sharpcap or Polemaster very accurately.

13
General Astronomy & Observing / Re: What to look at during a full moon?
« on: January 31, 2018, 01:40:04 AM »
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A full Moon is just about one full magnitude brighter than a 91% Moon, so full Moon here would be just about equal to no Moon in the city. The biggest problem was having that bright lamp hanging in the sky and blinding me. No worse than a city streetlight, maybe, but I never observe under streetlights in the city if I can help it.

I live in the middle of three cities sandwiched together and have not two, but three rather large shopping complexes surrounding me, in addition to one paper mill and two power plants. I live on a corner with two bright street lights. I have two neighbors that insist on leaving their bright porch lights on all night, not to mention headlights of seemingly never ending traffic.
Give me a full moon any night of the week. I'll find a way to make it work.

14
ATM, Optics and DIY Forum / Re: Mirror making workshop in Toronto
« on: January 29, 2018, 11:52:52 PM »
There's nooptical reason a F/12 would be harder than any other F ratio, in fact you would work to an easy to check sphere and then a couple minutes of parabolizing is all that's needed.

15
Beginners Forum / Re: Saving for my Telescope
« on: January 25, 2018, 08:46:49 PM »
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Welcome, there are good deals to be had on the classified section.

He still needs an extra 17 replies to get to it though.

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