Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.

Messages - sihealhdoggse

Pages: [1] 2 3 ... 8
John, one thing to consider; with my 16" dob, my 10'x10' is the minimum size for the scope to be put in a horizontal position.

Eyepieces Questions & Recommendations / Re: Tele Vue Ethos 3.7mm
« on: February 08, 2018, 07:12:52 PM »
I think this EP is on my short list for the Equinox 80mm and future refractors.

Thanks for the review! Al's advice seems like a very good spread for eyepieces.

"31T5 in concert with the Ethos 17, 10, 6, and 3.7mm"


Paired with my NP-101, this line-up works very well for me. Admittedly, it is quite a bit of money tied up on the lower magnification. end of the spectrum. But, that's one of the major reasons I own a NP-101. That and the virtually flat field produced by its Petzal design. The NP-101 is ideally suited for low power, wide-field observing which is how I use it most often. The 31T5 is my wide field sweeper with approximately a 4.5 degree FOV. The 17, 10, and 6mm Ethos allow me to aesthetically frame about any object, stepping between them in approximately 1 degree intervals from 3 degrees down to 1 degree. Wide field observing of extended Milky Way objects is all about framing and context. Now, the 3.7 allows me to zoom in to explore some interesting bit of detail. I also have the Nagler 3-6 zoom to fill in any high power gaps but with a 50 degree vice 100 plus degree AFOV. I'm sure others will differ in opinion but, right now, I can't imagine a more ideally suited kit for how I observe. Alan

Beginners Forum / Re: Help! Advice for a brand new astronomer
« on: February 08, 2018, 05:53:46 PM »
I tend to agree that an 8" Dob is going to be too much scope for a beginner; it's big, bulky, and troublesome to move in and out of doors. Also, any Newtonian Reflector is going to require collimation periodically; they are relatively high maintenance.Those of us who have been in the hobby tend to recommend what we think we would have liked to have started on or what gets you the best bang for the buck. Unfortunately, this doesn't always help a beginner who is coming in completely unfamiliar with the ins and outs of handling a telescope in the dark.

I'd suggest a refractor

https://www.optcorp....-telescope.htmlThis one offers brighter and wide-field views but will have trouble with higher magnifications and a false color halo around bright objects.

https://www.optcorp....ized-mount.htmlThis one offers computerization (a give and take IMO)and is probably the best Moon and Planet scope of the two of them.

All telescopes require some knowledge of the sky. Most people who buy a telescope and then give up say it is because they can't find anything. I highly recommend this site for starters: They publish printable sky maps for each month with plenty of notes and objects to look at with a small telescope and/or binoculars.


So then what exactly are these?

​It looks like a variation on the König.

Except that the Konig is a 3 lens eyepiece - not 5

You've got me laughing and sympathising with you Red. I can play this game to, but mine has a happy but very expensive ending.

First up, I was at my long term dark camping site that was being progressively over run by non-astronomers, so it was on the wain anyway. But one night, a drug wrecked young guy decided to do burn outs in his car, and drove over a tent with a young girl inside. Somehow he didn't kill her. That was a few years ago now, and I haven't been back.

Next up, was a nice site situated on a dam. One night, an hour or so after sunset a group of young guys came along and started pulling their boat out of the water. They got their car bogged in the mud, so a few of them got into the water to try and push it out. Next minute, one guy is screaming because a bug has crawled up his nose and is trying to get into his brain. The screaming went on for ever. I found it quite difficult to hold averted vision with all the wracket. That place had to go too.

Then I found a brilliant place near where I am now. It was an airport, and the locals would come to the area and hunt pigs on the other side of the runway with high power rifles. Nervousness doesn't describe sitting in the dark a few hundred metres away from someone shooting up the night.

It was almost solely due these type of experiences that drove me to buying my dark site property. Happy days now.

Reflectors Telescopes Forum / Re: LP and 8" Dobs
« on: February 02, 2018, 06:17:46 PM »
I have another 8in being built

That is a really nice video and mirror box.

I love wood working, and I was thinking of someday building myself a telescope. Are there any plans available or would I need to design my own? What about good books?

Light Pollution Topics / Re: NJ Pinelands under attack
« on: January 31, 2018, 01:54:10 PM »
The more I see threads like this, the more I think that a global apocalypse is the only way that we are going to get dark skies, if any of us live to see them.

It's much easier to simply move away from these people whose way of life destroys the sky at night.

Reflectors Telescopes Forum / Re: Tight Mirror Clips?
« on: January 31, 2018, 12:43:08 PM »
My 2 cents. I have my mirror cell with cork on the bottom 3 spots that support my 6" mirror. My 3 clips all have a small piece of thin white foam. This foam (maybe 1/8" thick) is on the clip part that rests on the mirror. This will prevent the metal clip obviously from scratching or gouging the mirror surface. Now what I do is I push each clip with thin foam down on the mirror, and the foam will compress a little, then I tighten the screw on the side of each clip. Once all 3 clips are tightened, I will carefully see if I can slightly rotate/spin the mirror in the cell with both hands. If the mirror will not rotate, I will then loosen the 3 clips (one at a time) and give each clip a very tiny bit of relief so the foam is not as compressed. I then will check again and see if I can slightly rotate the mirror a little. If the mirror will slightly and slowly rotate, I am done. Doing this has worked fine. There is not enough pressure on the clips to cause mirror distortion and yet enough pressure so the mirror will not rotate in the cell causing it to lose collimation when the scope is at different angles. The thin foam on the clips will allow for very slightly expansion since I can slightly turn the mirror. Again works well for me. If your mirror clips are not holding the mirror well, the mirror will easily spin in the cell or even slightly tilt and your mirror will go out of collimation even a little bit out of collimation, every time your scope is at different angles when observing.

Beginners Forum / Re: Celestron AVX Polar Alignment
« on: January 31, 2018, 11:54:13 AM »
Dear Folks,

Here is a linked page at Celestron talking about All Star Polar Alignment, it is very helpful.


Clear skies



Looks like ES isn't dumping eyepieces in the US market anymore. Might actually be trying to make money here.

Economy is recovering/recovered, and people have money to spend.
Before when they had those less expensive everyday sales we were in a major recession (depression), and many didn't have money to spend.
Economy has changed little from 2008 to 2017. The wealthiest are skimming better now than before and will for the foreseeable future, but the median has not really changed. Quality of jobs has continued to decline. It is a pretty empty recovery, which is why I haven't reinvested, and won't. The recovery isn't driven by the economy as a whole, but by the well-off. That isn't healthy or sustainable.
I don't know where you live, but here in Michigan, the Auto industry had GM and Chrysler almost go out of business, many lost jobs and houses, dropped medical insurance, and were just struggling to survive. I was glad to survive 3 years of layoffs at my company. Now Michigan is booming, stock market is at all time high, companies have and still are hiring big time, and unemployment is very low. When you are worried about your job, or your house, you spend only what you can or must. When you have stablity and excess money you spend more. Simple economics.

p.s. sorry if your area has not recovered yet. Sometimes catalog prices are different depending on where you order from (i.e. address/zip code based).

ATM, Optics and DIY Forum / Re: Cant afford vantablack?
« on: January 31, 2018, 10:46:11 AM »
Came across this...

That is only black because of the improper exposure by the camera/operator/post-processor.

As I understand your question, and I may have gotten it wrong :-), you want to know if you mounted your dovetail correctly. Here are my thoughts:

-Find a level bench to work on. I use my kitchen counter. Use your bubble level to check it.
-Place your ota on the counter and check to see if it lies level. You can shim it with pages from a newspaper on one end.
-Now roll the ota so the dovetail is straight up (12 o'clock). Measure it with the bubble level.
-Finally, rotate and measure the dovetail when it is directly to one side (9 or 3 o'clock).

These measurements should give you a reasonably good idea it your dovetail runs away from the tube (12 o'clock) or does not run parallel up the side of the scope (3 or 9 o'clock).

Good Luck
I hope this helps. I ran into this concern when I deforked my SCT.

Thanks I will do these examinations. I have an alternate formal dovetail assembly on shipment hold at ScopeStuff.

Reflectors Telescopes Forum / Re: The best scope is...
« on: January 30, 2018, 08:26:59 AM »
I started 20 odd years ago with a C8.  after a few years I got bored of it, it just wasn't that good at dim faint fuzzys even tho it was quite sharp at planets, moon, something was lacking.  so I kinda drifted from astronomy for awhile. I was still the web-n-email guy for my club, but I hardly ever showed up for events, and in fact the club kind of dwindled for lack of leadership and was running on autopilot.

About 10 years ago, I was given a broken Coulter 10" redtube that had lived in someones closet too long.  Mirror was a mess. cleaned it up, repaired some missing hardware, wow, not bad view but man this mirror needs plating, found Bob Fies at AlCoat, he did an awesome job in a week...  used that for 2-3 years, upgrading the focuser, adding finders, rebalancing it, replacing the mirror cell with one from, curved vane spider from 1800destiny, etc etc.  its a great grab and go scope because its short, only f/4.5, I can carry the OTA in one hand (its got a sturdy handle at the balance point) and the base box with the other (I replaced the floppy handles with sturdy workshop drawer handles) and be setup in 30 seconds.  best part is, it stays in collimation even when tossed in a stiffly suspended wagon, zoom up to a local mountain on a bad road with a bajillion hairpins, then setup.

then, a couple years ago, via my club (I'm now the VP as well as still being the webhack-n-emailwrangler), I became the keeper of a donated XT12i which had a particularly good mirror.   oh boy, aperture fever.  10" gets neglected, even tho I need a hand truck to move the XT12 around and it barely fits in my car.

fast forward a year or two... my trusty old volvo turbo 740 gets replaced with a Tacoma 4x4......  I bought a 3rd hand Discovery 17.5" truss dob last year.   WOW, this is at a whole other level of quality, now I can find AND enjoy all sorts of faint fuzzies AND actually see good detail on them.  I pass the XT12i onto another club officer with more storage space who also does outreach... 

buy a bigger car, end up with a bigger scope!

and 6 months later, (earlier this week) a former member donates a Obsession 20 f/5 to our club (of which I'm the VP), its setup on my driveway right now, being tested in spite of the full moon.  This just fits in my Tacoma.

Mounts Questions & Expirience / Re: EXOS2-GT
« on: January 30, 2018, 01:46:06 AM »

which telescope did you use for those pics? amazing job, my expectation was much lesser then what you showed me, any other pics you would like to share?

good job [/quote]
Thanks. I am a total amateur with AP...just starting to get into it. I also live in a ton of light pollution so I'm experimenting with ISO and exposure time, as well as just learning how to stack, etc.
I used my Celestron OMNI XLT 150mm f/5 (750mm fl) reflector on my EXOS2-GT. GREAT scope for visual and imaging...only 12 lbs. with a 6" mirror and the price is great too (High Point Scientific is the only place that sells the OTA without the mount) $240. I replaced the stock focuser, but others do well with it. My EXOS2-GT can do up to about 2 minute subs without guiding to keep stars round. Here's a pic of my setup on my first night imaging (those pics I took were the first images I ever took of DSO' I have a lot to learn). I don't have anything else at the moment...I haven't had as much time lately and now the weather sucks.

ATM, Optics and DIY Forum / Re: Your Hubble Moments
« on: January 26, 2018, 04:54:18 AM »

I somehow doubt Feynman was astounded at all about that, but have no sources...

Mark, what is that source of the photo of Feynman, and what is the significance of whatever he is doing with that C-clamp?
I think he's thinking of the necks of a few well-known self-serving bureaucratic and political morons in government and industry, and how satisfying it would be to just keep turning the handle clockwise.

Pages: [1] 2 3 ... 8