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Messages - stimtinpaso

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Beginners Forum / Re: First scope decisions
« on: February 09, 2018, 02:29:40 AM »
Like your tiny rig BTW. Any plans on chilling the camera?

Maybe one day. I got a small DC fan with my last electronic components purchase, just in case, but I'm not planning for that yet. I'm still messing around with optics (barlows, reducer, filters), I've got a long way to go first.

here's my definition:

Non-serious AP is imaging with cell-phones, and sometimes DSLR, but with no intent to pursue it as an additional hobby.

Serious AP is beyond all of that.

EAA is a whole different category, but very closely related.

I disagree with the notion of "categories" for the many types of EAA, a nice post I read in another forum explains it more like a continuum, and I agree:

<p class="citation">Quote
its definition is rather fuzzy. Some folks call it EAA, and others call it real-time or near real-time video astronomy. Once I even heard it referred to as casual astrophotography. These are all fitting names because everyone does it a little differently.

Theguy or gal using a video camera to look at images on a dedicated video screen will likely call it real-time video astronomy because the images show up right away, just as they would if looking through an eyepiece. In this case, the camera is like a super eyepiece that reveals more than can be seen with the naked eye.

Another observer might use the camera to take a longer exposure for a deeper look at the target, with the image refreshing on-screen every few seconds. Although this is no longer a real-time view, it could accurately be called near real-time video astronomy.

Someone else might make numerous exposures of 10, 20, 30 seconds or longer and stack them in software to give a very detailed view of their target. They view the image as every layer in the stack makes it progressively clearer. Is this near real-time observing? Maybe, but it is also starting to look like traditional astrophotography. I like to call this "casual astrophotography", but you might disagree. The point is, this type of astronomy is a continuum and it means different things to different people.

That last one of the continuum is the form of EAA I do: Stacking numerous short exposures in software for a detailed review of the target. I agree with the author's use of "casual astrophotography" to refer to it.

Maybe Night Vision could be though to be a separate category, but stacking short exposures on SharpCap is not. It's more like "casual" or "focus on speed" astrophotography, I think.

At f7.5, the Hyperion 24mm wasn't too bad. I thought it had the best contrast and color rendering of the series. The 5mm? I took a while replacing that. It was beat out slightly by a 10mm, Barlowed ortho. The 5mm X-Cel LX crashed and burned. It took one of the Barsta 58° eyepieces (the 5mm, obviously) to beat the Hyperion, and show better contrast, while offering some comfort. Not surprising, I guess. The 58° series are basically three element Königs with a Barlow. That said, they Hyperions are pretty good.

In the linked to test above, it looks like the Hyperion is the better choice at the focal lengths tested.

ATM, Optics and DIY Forum / Re: Adding goto to ATM dob
« on: February 08, 2018, 11:08:57 PM »
Glad to hear it is working well for you! Regarding the imperfections, you always go to school on the first one.

Most (and I even believe all) eyepieces are optimized for a scope with uncertain focal length, ideal image and telecentric off-axial rays.

OK. If so, then what is the meaning when it is said that a particular eyepiece is "well-corrected" for faster scopes?

I (perhaps naively) imagined that this meant the designer assumed a steeper angle of of-axis rays, and optimized for it.

Mounts Questions & Expirience / Re: Best way to polar align Losmandy mount?
« on: February 08, 2018, 12:53:36 AM »
I use the polar scope and find it gets me close enough for imaging. If I'm concerned I'll drift align. Polemaster seems like a sure thing though.

Beginners Forum / Re: So my Z12 turned into a Z10
« on: February 04, 2018, 11:52:19 AM »
<p class="citation">Quote

did you get a kit, or cut that all yourself?
my production facility manager hooked me up

but I still mainly cut scopes by hand


Learning a lot fast here!! Not wanting to derail the topic, but wanting to ask about a cruise as an option. At 4 minutes of totality in the Pacific, I wonder if that might be a better option?? Of course being stuck on a boat is not a good way to see and enjoy a local country culture. Considering expenses to either Argentina or Chile, would the OP and myself be better off on an eclipse cruise?

I would research the patch of sea where totality occurs. This is winter. This is relatively far south. What are the prospects of rough seas and storms in July?

And all your eggs are in one basket on a boat. If the weather forecast on land looked bad near Serena the days prior but better in central Argentina, you could hop on a regional plane to move to better weather on the other side of the Andes.

- Jim
La Serena to Mendoza is probably doable on short notice. SKY has relatively cheap flights from both cities to Santiago. However, given the interest in the eclipse, they may well be booked well in advance. The eclipse may also make getting a rental car difficult. Also, Mendoza is a few hours drive from centerline. If you were traveling with no checked bags, La Serena to San Juan on Sky and then Latam would be feasible and you'd be in the path of totality (on the edge) as soon as you landed. Again, flights likely to booked in advance. Given the cost of regional flights, it might be worth basing in Santiago and booking flights to both San Juan and La Serena and going to the best forecast.

I wish I hadn't put that advice out there. Can we lock the thread?

Beginners Forum / Re: If you could own just 2 telescopes...
« on: February 03, 2018, 01:31:08 PM »
My two have been satisfactorily getting it done for me a fairly long time, a XT10 (13 yrs) and ST80 (20 yrs). I also have PST which is specialty scope but it provides something those two can't deliver, otherwise those two are a complimentary pair to own.

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Finally, my dovetail plate arrived and I was able to mount up the second scope! I'm hoping this smoother motion is going to open up a whole new world of high-mag viewing for me. Time to go buy a Nagler zoom and 5x powermate...
Check out the completed system here:

Eyepieces Questions & Recommendations / Re: ES 17mm 92°
« on: February 02, 2018, 07:39:40 PM »
Hopefully there will be a 10 and 6 next. . . as these would be good to pair with the 17.

ATM, Optics and DIY Forum / Re: ATMer ALERT!
« on: January 31, 2018, 01:40:35 PM »
How good are these? For example how much can you push the magnification? Subjective opinions, I know but I'll take what I can get
They are the best mid range focal length lens ever, will goto 280x on the planets. At 300x the scattered colors smear out details.

Mounts Questions & Expirience / Re: Should I rebuild my AVX?
« on: January 31, 2018, 01:27:04 PM »
Nuke it from orbit. It's the only way to be sure.

Your not authorised for that !

Eyepieces Questions & Recommendations / Re: EP Suggestions Please!
« on: January 31, 2018, 11:12:18 AM »
Avoid wide field eyepieces as a beginner - they are difficult to use correctly* and expensive.

I disagree andrecommend the exact opposite. I bought a 9mm original Nagler shortly after Ibecame familiar with my first scope,and it soon replaced the high quality Plossl's I started with.Much easierto use than the narrow fields, better eye relief too. Better corrected than cheaper wide filed designs (e.g. Erfle type.)

I have no idea what you are talking about with respect to "use correctly." Compared to a 9mm Plossl like the OP has, any of the Nagler like eyepieces will be a huge improvement in ease and comfort of use. (And yes, I have a 9mm Plossl that came with a is never used.)For the OP:

Good ones are more expensive, but they arewhat you will stillbe using decades from now, while the cheap stuff...not so much. I prefer to pay once, not twice (hindsight being 20/20.)

The real expense is in the 2" wide fields...and this is no place to skimp on cheap versions.

With the limited budget, wait for sales, buy ES and/or buy used. I doubt the 8-24 zoom is that great optically and the apparent fieldwidth is"meh", but it covers a wide range so it is difficult to suggest a specific eyepiece that duplicates what it already does. With your 8" a 6.7mm ES 82 or 7mm Nagler would likely be a good fit for planetary on an average night, while a 4.7 ES 82 or 5 mm Nagler would work well on a good night. When I outfitted my son's 10"scope with similar focal length I chose the 4.7, 6.7, and 8.8mm ES 82's since they were on sale through the site sponsor with CN discountfor $95 each, shipped. They have been a good fit for that scope and I have no complaints. The sale last year started sometime in April...don't know if there will be one this year.
Find a good Ortho or a Radian and you'll see  For beginners, the best eyepieces are those without significant spherical aberration of the exit pupil and with relaxed eye relief. Also, his budget is limited.


ATM, Optics and DIY Forum / Re: Drilling large holes in carbon
« on: January 31, 2018, 10:00:18 AM »
I believe that was the gist of my post.
I believe MitchAlsup was just reinforcing your view because of it's importance.


Eyepieces Questions & Recommendations / Re: ES 82 series sales?
« on: January 31, 2018, 09:44:03 AM »
You mentioned coma, when FOV fever sets in the outside edge of the field becomes very important, that's where you get the target focused for the drift trip across.
The ES Coma Corrector is nice easy operation compared to the TV Paracore.
Your scope will need a low profile focuser to use a CC,
Not sure if theZhumell Z10 Dobsonia has a low profile focuser, most likely it is.

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