#1
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Horse Head region
I finally got to take my new (to Me) 8" f/4 Newtonian out under some clear dark skies. Here in MI we get perpetual cloudiness through out the colder seasons because of lake MI, so this was a treat. It came with a price, and that was -5F temperatures. It was so cold that the dec clutch on my CG11 mount would not hold very firmly and thus I had no dec control for guiding. Anyway here is 14 minutes of data through the new scope using a MPCC and a modified Canon XTi.
Joe |
#2
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Horse Head region
Joe,
Even without the lake on the wrong side we have nothing but clouds here too. Clear by day when the sun burns them off by by evening fog rolls in. Last night it was crystal clear at 6:30, by 7 nothing but fog. When we clear it is more like -30 not -5. For some reason my filter wheel is freezing up at those temps when it never has in the past. Warm the camera and the filters fog over but the filter turns. No win situation. An hour later the filters clear, the wheel turns and the fog has rolled in. These long winter nights are going to waste! Anyway that shot looks a lot like my long ago attempt at a 15 minute shot using my 6" f/4 and High Speed Ektachrome (ASA 160). But with less coma. Of course your chip is smaller than the 35mm frame so that might explain it. See some at the upper left corner but its minor. Tracking looks good for the balky clutch. Paramount has no clutches. A pain visually but sure makes photo work a breeze. Do you use a Baader or Lumicon coma corrector with that? Rick J McBride wrote: I finally got to take my new (to Me) 8" f/4 Newtonian out under some clear dark skies. Here in MI we get perpetual cloudiness through out the colder seasons because of lake MI, so this was a treat. It came with a price, and that was -5F temperatures. It was so cold that the dec clutch on my CG11 mount would not hold very firmly and thus I had no dec control for guiding. Anyway here is 14 minutes of data through the new scope using a MPCC and a modified Canon XTi. Joe ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#3
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Horse Head region
I use a baader. I don't know if the Lumicon is better or the TeleVue or the
Baader. Any thoughts? The alignment might be off just a tad to make the elongated star in the corner. The sensitivity of the alignment made me buy a laser and it is hard to keep it nailed down with a portable setup and quickly falling temps. Joe "Rick Johnson" wrote in message ster.com... Joe, Even without the lake on the wrong side we have nothing but clouds here too. Clear by day when the sun burns them off by by evening fog rolls in. Last night it was crystal clear at 6:30, by 7 nothing but fog. When we clear it is more like -30 not -5. For some reason my filter wheel is freezing up at those temps when it never has in the past. Warm the camera and the filters fog over but the filter turns. No win situation. An hour later the filters clear, the wheel turns and the fog has rolled in. These long winter nights are going to waste! Anyway that shot looks a lot like my long ago attempt at a 15 minute shot using my 6" f/4 and High Speed Ektachrome (ASA 160). But with less coma. Of course your chip is smaller than the 35mm frame so that might explain it. See some at the upper left corner but its minor. Tracking looks good for the balky clutch. Paramount has no clutches. A pain visually but sure makes photo work a breeze. Do you use a Baader or Lumicon coma corrector with that? Rick J McBride wrote: I finally got to take my new (to Me) 8" f/4 Newtonian out under some clear dark skies. Here in MI we get perpetual cloudiness through out the colder seasons because of lake MI, so this was a treat. It came with a price, and that was -5F temperatures. It was so cold that the dec clutch on my CG11 mount would not hold very firmly and thus I had no dec control for guiding. Anyway here is 14 minutes of data through the new scope using a MPCC and a modified Canon XTi. Joe ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#4
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Horse Head region
I meant to say TeleVue. Not sure if Lumicon makes one or not. I've
heard a lot of good things about the Baader. Seems to have a good reputation. Your stars do look better than I used to get even considering the smaller FOV. I know what you mean about keeping alignment. My 6" f/4 would lose it just slewing from one side of the sky to the other. Spider was (still is) the problem. I need to replace it. Have been thinking of reviving it with a corrector for wide field work. 600mm would make a nice FOV for the 11K. Your results look promising but not sure how it would hold up with the higher demands of a full 35mm frame. Wouldn't be hard to piggyback on the current scope as I have the rings already drilled and threaded for another mounting plate. Would need more counterweight but I have two 20 lb weights from my old Cave mount I'm not using that have the right 1.5" shaft size. Don't look nice like the factory ones but cost those cost $10 a pound. Rather ridiculous price. Mine came with the mount but extras I'd need cost that. So I cheated and already am using a 10 lb Cave weight. Hope the weather allows more shots. We got lucky tonight and the temp isn't dropping so the no fog. First imaging this year. Rick J McBride wrote: I use a baader. I don't know if the Lumicon is better or the TeleVue or the Baader. Any thoughts? The alignment might be off just a tad to make the elongated star in the corner. The sensitivity of the alignment made me buy a laser and it is hard to keep it nailed down with a portable setup and quickly falling temps. Joe "Rick Johnson" wrote in message ster.com... Joe, Even without the lake on the wrong side we have nothing but clouds here too. Clear by day when the sun burns them off by by evening fog rolls in. Last night it was crystal clear at 6:30, by 7 nothing but fog. When we clear it is more like -30 not -5. For some reason my filter wheel is freezing up at those temps when it never has in the past. Warm the camera and the filters fog over but the filter turns. No win situation. An hour later the filters clear, the wheel turns and the fog has rolled in. These long winter nights are going to waste! Anyway that shot looks a lot like my long ago attempt at a 15 minute shot using my 6" f/4 and High Speed Ektachrome (ASA 160). But with less coma. Of course your chip is smaller than the 35mm frame so that might explain it. See some at the upper left corner but its minor. Tracking looks good for the balky clutch. Paramount has no clutches. A pain visually but sure makes photo work a breeze. Do you use a Baader or Lumicon coma corrector with that? Rick J McBride wrote: I finally got to take my new (to Me) 8" f/4 Newtonian out under some clear dark skies. Here in MI we get perpetual cloudiness through out the colder seasons because of lake MI, so this was a treat. It came with a price, and that was -5F temperatures. It was so cold that the dec clutch on my CG11 mount would not hold very firmly and thus I had no dec control for guiding. Anyway here is 14 minutes of data through the new scope using a MPCC and a modified Canon XTi. Joe ------------------------------------------------------------------------ -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
#5
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Horse Head region
Nice result Joe.
I had similar problems with temperature at the beginning of January when we had record-setting low temperatures in Germany. Now it's back to the usual "slightly above freezing point at daytime and slightly below freezing at night". Stefan "J McBride" schrieb im Newsbeitrag . .. I finally got to take my new (to Me) 8" f/4 Newtonian out under some clear dark skies. Here in MI we get perpetual cloudiness through out the colder seasons because of lake MI, so this was a treat. It came with a price, and that was -5F temperatures. It was so cold that the dec clutch on my CG11 mount would not hold very firmly and thus I had no dec control for guiding. Anyway here is 14 minutes of data through the new scope using a MPCC and a modified Canon XTi. Joe |
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