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Overhaul of a Cave 8" Lightweight Deluxe

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#51 Datapanic

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Posted 29 December 2012 - 01:19 AM

And one last pass - a little more subtle....

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#52 tim53

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Posted 29 December 2012 - 09:32 AM

Hi Dan:

Here's a link to a thread I posted a while back of a gibbous moon shot with a T1i and TV NP101IS (that I've since sold). Second post shows where I've adjusted the color saturation up a bunch!

Color moon

-Tim.

#53 Datapanic

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Posted 10 January 2013 - 11:09 PM

Shot on Dec 28th, here's one of M42 - this was another first run test and I wasn't going for gold, but it came out pretty good for just a 30 second ISO 800 prime focus shot. No filters were used and this was taken just north of Tucson in the Suburbs early in the evening.

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#54 Da Bear

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Posted 11 January 2013 - 10:54 AM

Wonderful lunar shots..... great scope.

Da Bear

#55 tim53

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Posted 11 January 2013 - 11:11 AM

See everybody? Newtonians make GREAT deep sky cameras!

-Tim.

#56 Datapanic

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Posted 11 January 2013 - 05:14 PM

See everybody? Newtonians make GREAT deep sky cameras!

-Tim.


For Prime Focus, I replaced the stock focuser with a Novak super short helical focuser a long time ago. Novak is gone, but there may be other focusers out there with this low of a profile. Sometimes you can find the Novak focuser on CN Classifieds, S&S, etc. Otherwise, the mirror needs to be moved up the tube.

This picture shows the camera at focus. My old Pentax K1000 film SLR did not need to go in as far.

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#57 Datapanic

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Posted 11 January 2013 - 05:40 PM

Back in the Film days, it was always hit or miss for me. Even with the LFK Exposure Guide, I never knew if I got a shot right using the Pentax K1000 until after the whole roll was done and I got the prints back from the developer. Usually, I was lucky to get 2 or 3 good ones out of 1 roll. Here's a scan of one taken many moons ago (1984 or so) @ 1/250 sec ASA 400 color.

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#58 Datapanic

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Posted 11 January 2013 - 05:47 PM

Of course like it was back then and as it is now, proper tube weight counter-balance is required to offset the weight of a camera at the eyepiece end. The DSLR is a lot lighter than the old Pentax and only required about 5lbs of tube weight altogether. About 4lbs in this picture with the other 1lb on the upper end of the tube. With the right amount of tube weight in the right place, the scope is perfectly balanced and moves freely to any position and stays there with very little friction on the RA and Dec shafts.

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