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Dear Terry---

     Had an awesome night with the scope---I swear I could see bolder fields inside of craters last night--NO--they Were Bolder fields Terry!!! And Jupiter was fantastic with a beautiful moon shadow on its meridian that was absolutely Black, pin-point precise round, and amazing.

     Thank you, Thank you, Thank You!!!!!!!!!!!


Email conversation recieved from AG Optical


As it turns out, an astro-buddy of mine just received his new AG Optics10-inch iDK, and last night was "first light" for him, while it was the twenty-first month of my owning and using the C**-***

So, I turned my attention to my astro-buddy who was set up next to me.  Since it was first light for him, I though that of course he would have some problems to overcome: spacing, collimation, general mechanical problems.

I was wrong.  He popped his camera/OAG on with off-the-shelf adapters that he had received in the mail *that day*.  He connected his laptop to the Optec focuser without issue, straight from Sequence Generator Pro. He brought the system to focus.

It was beautiful.
  It was in collimation, and had one of the finest stellar images I have seen on any OTA, *including refractors*.  He proceeded to capture a bunch of test frames of M65/66, M13, M3, M104, and several other targets that I would consider a bit "difficult" at 1700mm focal length.  The iDK made short and easy work of it.

To add insult to injury :-), his focus, once achieved, stayed pretty much where it was.  He didn't have to tweak it *at all* over a couple of hours of exposure time, when temperatures were definitely falling.  The C** is good in that regard, but not *that* good!

In short, he did more work with the iDK in two hours than I had been able to do with the C***-*** in many evenings.  Even at a longer focal length (1700mm vs. 1250mm for the C**-***) he was getting much better sub-frames.  The iDK was making clean work of highly over-sampled data (roughly 0.65 arcsec/pixel), and that performance
was right out of the box with no optical, collimation, or mechanical

Bravo to Dave Tandy and associates for producing a sterling prize of an OTA. 


*Ostahowski Optics Inc., manufactured the optics for this telescope.


*email was edited in text to save space

Hi Terry,

Tonight is the first night of decent weather since I installed the secondary, and I wanted to write and say thank you. The improvement is really wonderful, in detail and contrast. I'm impressed, and grateful!

J. B.

A beautiful piece of work....


The customer received the mirror and sent us an e-mail

"Great mirror, please tell Ostahowski Optics my gratitude.


I wanted to let you know that I have had spectacular viewing with your mirror and have received many spontaneous comments about the views the scope has provided, especially about the contrast






We just want to give you a very big thank you for not only giving our 17.5 inch mirror a new lease on life, but also for taking the time to give us a tour of your optical oasis in the desert. It's not often that someone with so much experience and expertise also has the humility, generosity and last but not least, enthusiasm that you do.

Please pass on our appreciation to Frances for her essential work in getting our mirror coated. Hope your big chamber is coming to life on schedule. 

            Best regards, Doug, for Curiosity Peak

Hi Terry,

I know it's been a while but I finally have my old Starliner 10 inch F6.35 to operational status and things could not be working better.  I had to dispose of the original thin fiberglass tube and I replaced it with a thicker aluminum one in order to accommodate the more modern adjustable spider and secondary.  It took a lot of time but was well worth the effort, as collimation is now a breeze. 

So I got my first couple of nights viewing in last week and it appears that not only did I get what I asked for but received much more than I expected.  I was right about the long focal length, I love it even though the tube is a bit heavy.  The big surprise came when I got some good (but not fantastic) seeing conditions last Tuesday night.  Jupiter was putting on a show with a transit and the Red Spot and I was just blown away by the optical quality of the scope, crisp detail from top to bottom of the planet and little round distinct moons.  I jumped over to the trapezium in M42 and observed a distinct dark space between the brighter star in the group of four and the dimmest star that is the most difficult to resolve. Really sharp stars!  Using a 9mm Nagler and a 100 degree 20mm Explore Scientific made for quite a show, even in the midst of San Diego light pollution.

When I read all those words like, "Spectacular," "Jaw-Dropping," "Stunning," that have become cliches in amateur astronomy I always say to myself, "Sure."  But when it's an actual experience, it plants a smile on the face that won't go away.

Thanks for creating the optical system of my dreams Terry, I couldn't be happier.

I hope all is going well,



The mirror arrived this afternoon safely - it looks great. I appreciate your efforts in producing the mirror for me.



This was sent in by S.F., we re-figured the optic for his imaging scope





First target, Jupiter. Swirls and festoons on each of the bands!. Next M5 - all stars resolved to the core.


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