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Posts posted by Ransu
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Very good looking Observatory Malcolm. It is very fast to start observe, and nice to have placer for astro stuff:)
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WOW!
Impressive work. You need a big observatory for that clock:D
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Very good- and pro looking Observatory Malcolm. Congratulations!
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Looks really good Malcolm, very well done and i like the green colour.
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Did you get solution for that problem allready? I read today from Finnish astronomy forum about same type of problem. Have you chek dec axis backlash menu parameter level from synguider handcontrol?
There was some kind of bug in that guys software and it did not show right level. It was more than 10, guy in forum scroll the numbers down more than half minute untill get 9.9 value. He continued and leave 0,5, after that perfect guiding. I just checked mine, level was 0 and maximum i can get is 4.0
William Optics ZS 66 SD and focal reducers
in Discussions - Cameras
Posted · Edited by Ransu
I have tested couple reducers and flatteners with my Astro Professional 66/400
I think it's propably quite same optically?
Celestron 6.3 reducer may work if you use quite small chip camera, for DSRL sensor size it gives bad results near edges.
Sample images, if you want zoom images bigger, try here:
https://picasaweb.google.com/106884738215780458002/Ap66?authkey=Gv1sRgCJ34xfe0t9SZFg#5665791940156988898
AP66/400 without flattener or reducer:
https://lh4.googleusercontent.com/-ZW9VpZkFROA/TqDvCw-w8-I/AAAAAAAAG3k/kDazQqVeL9k/s576/ap66ilman.JPG
AP 66/400 with SCT6.3 reducer
https://lh6.googleusercontent.com/-7dk619s5SZc/TqDwKsgfZqI/AAAAAAAAG3w/sPOPdiI92mw/s576/ap66c80.63red.JPG
AP66/400 with Draco 0.8Xreducer
https://lh5.googleusercontent.com/-LxO3CC1qP6w/TqDvwDxUHeI/AAAAAAAAG3s/JJHblIWBISk/s576/ap66draco0.8.JPG
AP66/400 with TSFlat:
https://lh4.googleusercontent.com/-9xkSoIaieYQ/TqDvYra9HFI/AAAAAAAAG3o/qBpNpMxPOpM/s576/ap66tsflat.JPG
AP66/400 with TS Coma corrector for Newtonian
https://lh4.googleusercontent.com/-IMSrYC2xXGU/TqDw_JSHieI/AAAAAAAAG34/sHyZp-3e0x8/s576/ap66%252520tscomacor.JPG
None of these gives perfect result, i'm searching WO typeII reducer, but they seems rare to find. Also i have thinked TeleVue TRF-2008 may work well. Has anyone tried televue with 66/400 telescopes??
Surpricingly Newtonian coma corrector works quite well with these telescopes.