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Topics - alssysenar

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It seems quite a few premium eyepieces have very sensitive eye placement issues with blackout and kidney bean. My 11 DeLite was picky, and so is my 17mm ES 92. Conversely, my Panoptics, Plossls, and 12mm Nagler Type II are extremely easy to look through and have no eye placement issues.

Is it just something inherent with long eye relief eyepieces?

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ANYBODY know of a source for 10" wide .094" wall thickness 6061 aluminum tube in 5-6' length? This is for a height extension for AP 10" portable pier.

Mark

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ATM, Optics and DIY Forum / The Pogson Platform - a truss focuser
« on: December 31, 2017, 06:27:11 PM »
Aside from my interest in the Stewart Platform, back in August I mentioned in response to Pierre here that I had a method for focussing that used the trusses alone, along with a brief description. It was just an idea, but an intriguing idea that offered some interesting possibilities, especially for rich field telescope and lightweight travel scopes.

Anyway, today I decided to build a crude prototype and test it.

First the trusses.
1. cut up some scrap pool fencing. Thats 16mm aluminium tube powder coated black. I used the drop saw to cut 6 equal lengths.

2. then fit some 20mm phenolic balls to each end joined by M6 threaded rod.

At this point I should really have made them adjustable to exploit as a Stewart Platform, but decided to leave that for another day. Today we keep things very simple, all I want is 6 equal length truss poles with hard round ends.

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ATM, Optics and DIY Forum / A visit at the children of Anton Kutter
« on: December 31, 2017, 12:10:19 AM »
November 8,9 and10 Guy Wauters (telescope making Group Gent , Belgium) and i wer invited to the children of Anton Kutter. Klaus, Adrian and of course Florianne (Flori) Kutter. A visit we will never forget.
A first impression (almost 8 minutes) on youtube. More will follow the coming hours !!!
https://www.youtube....h?v=jtPa7Fc0f_Y
enjoy !!
Jean-Pierre

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Mounts Questions & Expirience / AZ/EQ-6 enough for 6" f8 doublet refractor?
« on: December 30, 2017, 04:33:22 AM »
Assuming visual use only and a picky observer when it comes to vibrations, do you think the Atlas AZ/EQ-6 could be sufficient for an APM 6" f8 doublet refractor?

I'm planning a concrete pier for the head.

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I don't need to rehash AP vs 10Micron and all that, they're both great mounts I know. A friend of mine who lives away's away from me so I can't do a side by side compare with my Mach1, which I'm still learning how to setup and use, is getting a 10Micron GM1000HPS and we just started discussing the differences and similarities and I wanted to ask here too. Really only a couple questions:

1) Is the 10Micron GM1000HPS easier to use and quicker to setup and polar align?
2) Is it a given that unguided ability is better with the 10micron due to the absolute encoders used in the 10Micron?

The big question:

3) Used visually and for AP does the 10Micron bring anything to the table that the Mach1 is lacking?I'm not worried about support. I know Deep Space products is the vendor here in the USA and have full confidence in that they would fix most anything if it came up. AP support is stellar as well. From my forum review 10Micron products don't seem to break alot. Neither do AP products which I really like so its not which one is better, etc. I really am attracted to being able to image for long periods unguided without having to hook up a computer or guide camera. That alone is attractive to me. The simpler the better too. I can't imagine any mount being nicer than a Mach1 and love mine but with my friend who's much more experienced than me going with 10micron I wanted to see if I'm missing anything with my new Mach1 w/GTO4?

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Eyepieces Questions & Recommendations / Nebula filters
« on: December 29, 2017, 02:19:48 PM »
Hello!

Trying to find an opinion on theExplore Scientific UHC Nebula Filter 1.25"? Is it worth investing in? It can be found in online stores in Europe for around £45 but I have found few reviews regarding it.

The obvious alternative,DGM NPB narrowband nebula filter 1.25" which many are talking about seems hard to be found in EU online stores and sell for about £75 in the US + expensive shipping to Sweden. Any resellers in the EU that I have been unable to find so far?

Am I correct that these filters fill the same functionality or I have messed this up? Any other alternatives (1.25") to the DGM available for a reasonable price in the EU?

/Eskil

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Beginners Forum / Combination of Telrad
« on: December 28, 2017, 04:58:07 AM »
I'm trying to move myself from having to get a GOTO mount and going in another direction of maybe making star hopping even easier? I'm thinking of getting a Telrad, but then taking it a step further and changing my finder scope to one with illuminated cross hairs. Does anyone else have this combo on an SCT? Does it help? Basically you bullseye the target with a non magnification telrad to get close, then further zero in with the Raci with illuminated cross hair and then via the scope?

Orion 9x50 RACI with Illuminated Cross Hair
http://www.telescope...CFQaNaQod54EBhw

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ATM, Optics and DIY Forum / Delrin sources?
« on: December 27, 2017, 07:46:48 PM »
Hi folks:

I've been thinking about replacing the ABS plastic plumbing caps that I machined for bearing dust covers with Delrin covers. Where do people get their Delrin? I think 3.5 inch rod would be sufficient, but I'd prefer 4 inch rod instead. I can only find this in 1 foot lengths - shorter/cheaper would be better.

Here's one with name brand black Delrin:

http://www.professio...CFUUYHwodI5wJ8A

and an off brand acetal rod (about half the price):

https://www.intersta...er=4.000&dim2=1

Will Delrin offer significant advantages over the off brand?

That's a Byers 7 inch RA gear - so pretty .

Thanks,

MichaelAttached Thumbnails

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Does anyone know what's happening in the ortho marketplace?  Clicking on University Optics' site brings up the message : "Thanks for visiting, but this website has been closed down at the request of its owner."

Going to Agena's site indicates that AstroHutech orthos and Kasai Trading Co.'s eyepieces are on closeout - all sales final, no returns accepted.

My perception is that essentially each these orthos and other Japanese eyepieces are all made in precisely the exact same mill in Japan.  Might it be possible that there's something happening in that mill?  Are orthos done?  Does anyone know what's happening here?

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