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Topics - reapriavoland

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Hey all, another newbie here,

I'm looking to add another barlow lens to my collection with the goal of getting the highest magnification feasable from my 8" f5 reflector when using an ES 82° 6.7. That's roughly 150x and I already have "shorty" type 2x barlow for a hearty 300x. I'd really like to get Jupiter and its moons as big as possible, pushing 50x-60x per aperature inch when conditions are good, or either a 2.5x (375x) or 3x (450x).

I bought the 2x (meade) when I bought the telescope without much knowledge about the mechanics of barlows or eyeieces because it was cheap and now that I'm purchasing nicer eyepieces I'd like to get the most out of them. It's actually nice enough and serves it's purpose, and there's 3x version I could pick up, but there are obviously many other options at various price points.

Would it be worth the additional cost to buy a better quality barlow? How do you determine the image quality of a barlow lens when looking at its specs? There are 2 element designs all the way up the 5 element designs, all those lens must serve some purpose. Also, would using a 2" lens with 1.25" eyepiece affect the image at all or would the end result be the same as a 1.25" lens?

What do you fine folks think would be best for me and my equipment? I'm not in much of hurry to make a purchase, since there haven't been many clear nights lately, so I could hunt for used ones for awhile if that's best.

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Beginners Forum / Help seeing Catalina
« on: December 29, 2017, 05:35:50 AM »
Early this morning, I scanned the sky between Arcturus and Alkaid with my 7x50 binoculars. I looked for about 20 minutes, but could not see anything that looked like a comet. Jan 12 is supposed to be Catalina's closest approach to earth. Why can't I see it? Am I doing something wrong? I wanted to look longer, but it was just too cold out there.

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Quote
One radical option I had been poking once - the "lay along" mount. Which is basically a narrow bed with the scope mounted in parallel above it (eyepiece down) on a motorized Alt/Az mountwith ellipticalAlt rails. But might be too comfy to resist sleep all night...
Oooooohhh ! NICE.
For these cold winter nights, you crawl into a sleeping bag, just in case you do nod off.
No doubt someone will object to body-heat thermals; for that you cover the bag with a space blanket !
Last problem would be the people standing in line to try it out (Hey when do I get my turn !!! Is that snoring I hear in there ??! )

Seriously I like it, it solves all the issues of observing comfort I can think of, One heck of agiant leap past standing on a ladder
Not sure about portability, but you do have me thinking
CS
Bob

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I think I need a 6mm eyepiece for planetary observing in my refractors. Problem is, there are just a few out there with decent eye relief and very good sharpness. I saw a post by Starman where he listed a number of brands with this focal length and they were either economy grade or super premium with a couple in between that I know nothing about. As stated, >10mm eye relief, very good sharpness and using price as a quality guide, something $100-200. I have a 4mm and 9mm Delite. I'd welcome any suggestions of some to examine further from this august body.

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Reflectors Telescopes Forum / Astroscan Successor!
« on: December 24, 2017, 05:06:52 PM »
It appears like Norman Sperling has brought back the Astroscan using Schott glass and other redesigns.  He is conducting a Kickstarter to fund making them.

https://www.kickstar...-eye-telescopes

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ATM, Optics and DIY Forum / Why does the grinding process work?
« on: December 24, 2017, 04:23:47 PM »
Can anyone explain to me specifically why the mirror grinding procedure works?  I can not find any specifics online.

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ATM, Optics and DIY Forum / Looking for a 10" F8 mirror
« on: December 24, 2017, 03:25:48 PM »
Hi,

Now I'm retired I have the time to build a 10" F8 OTA to your best planetary images realistically possible.

I have a 1/16th wave two" Clave' apartment for it.

How ever no one seems to sell such mirrors.

I'm in the UK and Orion Optics UK are supposed now able to create good mirrors.

Is this my best option?

Cheers.  Andrew.

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Or alternatively, how dark do your heavens need to be?  I have always thought that the Pleiades were magnificent with this beautiful nebulosity, but naturally, I have never seen it.  Can it be viewed visually?  Under what conditions?

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Beginners Forum / technical name for a fork mount
« on: December 24, 2017, 02:37:08 AM »
Hello,
sorry if this is a dum question,
What is the technical name for a '<strong>fork mount' </strong>as exhibited in pick under....thanks for answering, JJ Attached Thumbnails

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