|
Post by kevinbarker on Dec 23, 2012 14:54:34 GMT -5
John I am considering several options. I am in not in a rush though. The lens might sit in a box for a while whilst I think and problem solve.
a) wooden using marine plywood and wooden formers, either a hexagon or octagon shape. Several Australian amateurs have tried this approach. It is relatively simple and if well made sholud maintain good collimation etc. Cloudy nights has a good forum thread on one made by an gentleman called Andy jackson for a 5 inch f-12 R30. I would probably use 6 mm 5 layered marine ply and 12 mm ply spacers which act as baffles.
b) irrigation tubing or PVC pipe. Issues mass and also expensive turning. In the past my twin brother and I made a 14 kg plus 6 inch f-12 D&G scope using this approach. Also I have a small Zeiss AS80 ota which an friend Gary Beal helped me construct.
My twin has just inished a very useable ota for a 5 inch surplus shed lens. 127/1200. He re spaced it using trial and error and has made a great light weight ota using PVC drainage tubing. He turned wooden pieces to fit the ends and then used shims to collimate.
c) Ales TCR idea. With a simple shroud it should work well even in a city.
I have come to release this type of large scope will require a GEM. I have a Zeiss 1b and an older astrophysics AP 600. The Zeiss 1b struggled with the torque of the 1.8 m length of the D&G. It copes well with my 11 kg 1.0 m Zeiss APQ130/1000. I reckon the Zeiss mount would cope with an ota if the length is approx 1.3 m and mass around 10 -14 kg.
The old Astrophysics mount should work for a bigger beast. I would make a large solid tripod from timber with an AP adaptri on top.
best wishes
|
|
|
Post by jimcurry on Jan 9, 2013 20:58:29 GMT -5
|
|
|
Post by Ales - iStar Optical on Jan 10, 2013 5:48:14 GMT -5
We will attend NEAF this year, we plan things our with Mike already. We want to introduce our TCR model there and many other refractors. cheers, Ales
|
|
|
Post by jolasa on Jul 21, 2013 11:53:22 GMT -5
I am the first to purchase an Asteria 150 f12 R35 FMC. Mike shipped it to me from SCAE.
Report to follow soon.
Can I get a spot diagram for this lens?
If the Raycorr comes to be, will there be one for this scope?
JonS
|
|
|
Post by Mike on Jul 21, 2013 21:55:38 GMT -5
John, I'm sorry we no longer provide individual interferograms or spot diagrams with lenses. Every lens is bench tested and star tested before being shipped to the customer. Providing such test reports has turned out to be nothing but trouble. Now I see why AP and TEC have never done it. Ales and I are sorry if this takes something away from our customers but it has proven to be detrimental for the company.
We are currently working on Raycorr. I know we have said that for sometime but the fact is it is a work in progress. You all are tired of hearing excuses so I won't give any. Only that we want it as much as you do. Istar has a been labeled as a company that peddles "vaporware." Ales promised the product two years ago and it has yet to materialize. The answer to your question Jon is yes, we hope to have a Raycorr model for your scope. That is the plan.
|
|