Hi Okki, Very nice test images! Well done! If I try to "see" only the green color in your star test images, I can see it is a superb lens. Some little zone...
... Hi zeissnut, hi have retest my ed80 whit third part of thresold of soils,i think it's more true,the strhel is 0.95%(but you experiment whit it) look on ...
ixio, OK I will look at the images in the next few days. Thanks. - John B. ... green ... Some ... effect. ... one ... seems ... Strehl. ... the ... with ......
Hello roddier test community! I'm Peter from Berlin, Germany and this is my first contribution. At first I studied the cookbook and compare it with my own...
Hi Peter, I am glad to hear your experience from "across the pond" with Roddier. I will try to respond below to your thought provoking questions.... ... ...
Hello John! At first I want to say thank you very much for your detailed answer! It was not my intent to be provocative!!! I wanted only to speak about a...
Hi Peter, ... If you do some test, I would suggest to make several measurements with and without the binning. That way it is easier to see if differences are...
Hello John! Of course I will test different binning modi (1x, 2x 4x) and different star image diameter on chip (e.g. 0.5 mm till 2.0 mm in steps of 0.25 mm). ...
Hi Peter, ... Thats a lot of images! Maybe it is not necessary to test all combinations.... ... I think its does not need to be so accurate as 3 pixels. The...
Hi Peter, I ran some test last night with a TMB 80/600 APO telescope. It is small scope not affected too much by bad seeing, and is easy to set up. I used...
I am hoping to perform Roddier testing on my recently aquired William Optics Megrez 90. I have a Meade LPI that I am planning on using. This, of course, puts...
Hello John! You did a lot of tests in a very short time which gives a first proof that binning and pixel size of start image have no influence on strehl and ...
Hi Greg, Look forward to seeing some results on the WO Megrez 90. Couple comments below.... ... William ... aquiring ... the ... 500 ... idea ... I do not...
Hi Peter, A few answers.... ... Yes, I agree 3 tests are better than 2, etc. Even more is better if you have time. When making any Roddier test is it good...
Hello John! It must be deep in the night (in your time zone) when you wrote your last answer. Your answer for the 8 bit LPI camera for using in roddier test ...
Hi Peter, ... There is a difference between summing many 8 bit images (hundreds or thousands) and obtaining a 16 bit result, and merely converting a 8 bit...
Hello John! Thank you for your detailed answer. Now I begin to understand what you mean but in using Registax I'm a beginner only. Now I have modified my small...
Hi Peter, Some comments.... ... I think the star is a little too big. I get 1.8 arcsecond diameter at 8m. The resolution for this telescope is about the...
Also the 130 image is very weak or faint. Pixel values are badly quantized for some reason. Values are n x 256 where n=0,1,2,3,4,5,6 Maybe there is some ...
I was thinking more about the brightness gradient in the 130 and 223 images. It is also possible that problem is in the camera or camera optics. I will...
Hello John, many thanks for your quick answer. I will see what I can do but I can not choose a greater distance than 8 m in my flat. Maybe I can reflect the...
Hi Peter, Some more ideas... ... No. I was wondering if maybe the camera automatically uses 2x2 binning or sampling as the "normal" setting. That might...
Hello John! Last evening I executed again some tests with 40 pixel star diameter and 2 x 2 binning and other without binning with pixel star diameter 160 and...
Hello John! I forgot one remark. The value for distance intra and extra in my new example about +/- 3 mm are still different to the real values. Now I measured...
Hi Peter, I agree Strehl 96% - 98% range. But it will depend on the de-focus distance, so we need to understand that. I still do not understand why the...
Hello John and all other members of roddier test community! I repeat some tests in order to solve the problem that the distance for intra and extra focal image...
Hello John and all other roddier test community members! I made 5 new tests and added one test from yesterday. Now I can make a first statistic with first...
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