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Equipment Discussions >> Refractors

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Joe C
sage
*****

Reged: 11/29/08

Re: First Light Astro-Physics 175 EDF new [Re: Joe C]
      #6214357 - 11/25/13 12:58 AM

I got mine from Markertek but the are no longer listed. Here is a source.

http://www.diyroadcasesstore.com/external-corner-caster/


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Peter Natscher
professor emeritus


Reged: 03/28/06

Loc: Central Coast California
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6215129 - 11/25/13 01:19 PM

I found and placed an order with TCH in Buffalo, NY for two of corner castors similar to the previously mentioned ones.

TRANS CONTINENTAL HARDWARE,INC - TCH
TCH INSIDE SALES USA
1370 WILLIAM ST., SUITE 4, BUFFALO,NY 14206 Phone: 416-299-0089 Fax: 416-299-3255 Web: www.tchweb.com

Item: Corner Caster (Zinc)
Item No.: 511-2294800
$13.26 each


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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: Peter Natscher]
      #6216159 - 11/25/13 09:35 PM

Thanks guys, lots of good ideas here.
David


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star dropModerator
Snowed In
*****

Reged: 02/02/08

Loc: Snow Plop, WNY
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6216260 - 11/25/13 10:33 PM

Have there been subsequent observations? Or perhaps a picture of the business end might be a nice touch?

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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: star drop]
      #6218346 - 11/26/13 11:06 PM

No observations yet, it's been rainy here in AZ and waiting on a dovetail plate. It's just been sitting snug-as-a-bug in it's case. Pics to come.

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Dwight56
member


Reged: 04/17/10

Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6222114 - 11/28/13 06:25 PM

WE have tonight and tomorrow night looking good to try out your new AP 175

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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: Dwight56]
      #6222638 - 11/29/13 12:45 AM Attachment (34 downloads)

Still waiting on the dovetail plate... I did finally take th scope out of it's cozy case and gave it the once over. The quality is beyond anything I have ever owned, It is right up there with some Swiss watches I used to own. EVERYTHING about the scope is top notch. I see why some are so carefull about belt buckles and rings. It would be a shame to scratch it. The objective glass has the number 52 writen on the edge of what looks to be the front element. The focuser is a beast. My old TEC140 had a 3-1/2" Feather Touch, but this one has a 4". It is way over kill for visual observing. In this reguard it is kind of wasted for the type of observing I'll be doing (no imaging). A 2.7 would have been just fine. So far, the only down side is the weight and the large diameter of the tube. Doing a comparison, the 160 has a tube diameter of only 6-1/2 inches whereas the 175 has a tube diameter of 8" I am left wondering if that is the only size aluminum tube that is available for the near 7 inchers. I see the TEC180FL uses the same size large tube and Ditto for their 160ED/FL line they drop back to a 6.5" tube as well.

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JJK
Carpal Tunnel


Reged: 04/28/08

Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6222661 - 11/29/13 12:59 AM

I never thought I'd be interested in imaging. That ship has sailed.

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Mike Clemens
Frozen to Eyepiece
*****

Reged: 11/26/05

Loc: Alaska, USA
Re: First Light Astro-Physics 175 EDF new [Re: JJK]
      #6222710 - 11/29/13 01:52 AM

> The focuser is a beast.
> It is way over kill for visual observing.

It's the best. My TEC FT3545 takes some threading of fine pitch, large diameter threads to switch from visual clamp over to field flattener. It is never fun and difficult to get started threading right especially in the cold.

The AP 4" focuser dovetail clamp is simply awesome. I could switch the AP175 from visual to photographic with field flattener 10 times in the time it takes me to reconfigure the FT3545 focuser.

I hear where you are coming from of course, but never say never.


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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: Mike Clemens]
      #6223520 - 11/29/13 02:19 PM Attachment (24 downloads)

Just ordered a Losmandy DAP6/7 dovetail plate from OPT (clearence item) at substancial savings plus free shipping for the Christmas Holidays! Who does not like to save money?
I am asuming the field flattener is in the smaller of the 2 boxes. Have not opened it yet. Is there any benifit to using the flatener visually? (sorry newbe question).
David

Edited by Neptune (11/29/13 02:40 PM)


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Erik Bakker
Carpal Tunnel
*****

Reged: 08/10/06

Loc: The Netherlands, Europe
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6223602 - 11/29/13 03:05 PM

The bigger clearance of the tube in your 175 means it will have stabler images sooner than with a tube with less clearance. So that is good for visual use. And the 4" focuser will help in balancing the massive triplet lens, thus shortening the distance from the eyepiece to the tube rings, which means a shorter swing arc for the eyepieces. Another plus for a visual observer

Enjoy that marvelous scope and post a short first light report asap


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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: Erik Bakker]
      #6224212 - 11/29/13 09:06 PM

>The bigger clearance of the tube in your 175 means it will have stabler images sooner than with a tube with less clearance. So that is good for visual use. And the 4" focuser will help in balancing the massive triplet lens, thus shortening the distance from the eyepiece to the tube rings, which means a shorter swing arc for the eyepieces. Another plus for a visual observer<

Never thought about that. OK I'm more convinced now. I did forget about the balancing issue. Dovetail supposed to be here Wed. Phoenix skies are not the best from what I've seen. That is what partially got me motivated to jump on the opportunity to get this particular size scope. For the money I could have gone much larger in diameter with other designs, but I could never really use that much aperture for detailed planetery viewing, not to mention the light pollution. Full report on it's way...


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star dropModerator
Snowed In
*****

Reged: 02/02/08

Loc: Snow Plop, WNY
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6224799 - 11/30/13 09:16 AM

A three or four inch barrel diameter eyepiece would also help with balancing.

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mgwhittle
Pooh-Bah
*****

Reged: 08/24/11

Loc: Chattanooga, TN
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6224802 - 11/30/13 09:18 AM

Quote:

Is there any benifit to using the flatener visually? (sorry newbe question).
David




No, it's not designed for visual use.


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Patrik Iver
professor emeritus


Reged: 07/29/03

Loc: Kaarina, Finland
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6225488 - 11/30/13 04:21 PM

Quote:

So far, the only down side is the weight and the large diameter of the tube. Doing a comparison, the 160 has a tube diameter of only 6-1/2 inches whereas the 175 has a tube diameter of 8" I am left wondering if that is the only size aluminum tube that is available for the near 7 inchers. I see the TEC180FL uses the same size large tube and Ditto for their 160ED/FL line they drop back to a 6.5" tube as well.




While I'm not lucky enough to ever have seen a 175 EDF up close, I would guess that the tube is machined/turned, i.e. made from a thick wall tube "billet" into whatever dimension the designer thought was best. Atleast my 130 EDF GT is made that way, and I'd expect the big brother to be similarly made. Therefore I have a hard time believing that availability of thin-wall "standard" tubing would have anything to do with the chosen tube diameter.

I could be wrong of course, in which case I'm sure someone will correct me....

Edit:
I think I'm right, as the photo some posts above shows a large number of small baffle ridges similar to what the 130 uses.

Edited by Patrik Iver (11/30/13 04:24 PM)


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mgwhittle
Pooh-Bah
*****

Reged: 08/24/11

Loc: Chattanooga, TN
Re: First Light Astro-Physics 175 EDF new [Re: Patrik Iver]
      #6225524 - 11/30/13 04:46 PM

Patrik, you are correct. The tube is turned from a thicker piece of aluminum and there are numerous baffles down the entire length of the tube.

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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: mgwhittle]
      #6244243 - 12/10/13 08:43 AM

Still no first light to report. The rings don't match up to the Losmandy plate adapters... go figure. The rings must be older (bought used off another Astro site) In the process of drilling the rings with 60mm spacing, which is one of the choices used on the adapter. Cloudy but clearing up, getting close to actually using this thing!

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Neptune
member
*****

Reged: 04/16/07

Loc: Arizona
Re: First Light Astro-Physics 175 EDF new [Re: Neptune]
      #6246194 - 12/11/13 01:12 AM

See my first light report in the refractor section under Musings on a new AP 175EDF.

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