Jim, Yes, one of the goals of producing an athermal telescope is the minimization or elimination of focus shifts. "Elimination" is like reaching infinity. It...
81
gjwcac
Jul 19, 2012 4:25 pm
If the goal is to minimize focus drift over changes in temperature, what is the optimum configuration for a CF tube assembly? I'm assuming a fully reflective...
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Karel Teuwen
karel_teuwen
Nov 16, 2010 10:02 am
Thank you very much David ! regards Karel _____ Van: DreamTelescopes@yahoogroups.com [mailto:DreamTelescopes@yahoogroups.com] Namens david.fitzhenry Verzonden:...
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david.fitzhenry
Nov 16, 2010 9:15 am
That's a beautiful image Karel!! Stars are pinpoints to all corners, star colours look great, good detail and low noise in the nebula with the bubble standing...
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polaraligned
Oct 3, 2010 11:47 am
WOW!! Some of the best images I have seen! Scott From: Karel Teuwen Sent: Thursday, September 23, 2010 11:58 AM To: 'CCD-astro Group' ;...
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Karel Teuwen
karel_teuwen
Oct 3, 2010 5:03 am
Hi all, After the great rendition from Rob posted recently on this list, here is my humble effort on M27. You will find the full resolution and info by...
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david.fitzhenry
Sep 26, 2010 10:59 am
Beautiful images Mel - nice deep shots! My preference would be the Hubble palette for the Bubble nebula. The only suggestion I would make is that you may...
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Karel Teuwen
karel_teuwen
Sep 23, 2010 5:15 pm
Hi Mel, Most impressive pictures but my favorite one is NGC7331, it is going very deep !!! Good job on both targets Mel !!! regards Karel _____ Van:...
73
Karel Teuwen
karel_teuwen
Sep 23, 2010 4:02 pm
Hi all, After the great rendition from Rob posted recently on this list, here is my humble effort on M27. You will find the full resolution and info by...
72
melhelm
Sep 21, 2010 4:45 pm
Hello all: I just finished the Bubble Nebula. I tried several different palettes for fun: Here is the standard Hubble palette:...
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Karel Teuwen
karel_teuwen
Sep 10, 2010 5:58 am
Hi Mike, No problem for that one print for your own use. Yes, the optics must be very good, but also some credits are going to the spikes who are absorbing a...
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Dream Telescopes & Ac...
dreamscopes03
Sep 10, 2010 2:26 am
Everyone, I like Karel's <http://www.karelteuwen.be/photo_page.php?img=277&album=15>M27 image, which he has also recently completed. When you click on the...
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parabola30
Sep 9, 2010 7:45 pm
Karel, Wow. If you don't mind, I might have to make a BIG print of that and hang it on my optical shop wall for motivation! I love the clean star images that...
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Karel Teuwen
karel_teuwen
Sep 9, 2010 6:34 pm
Thanks a lot Jim for the nice comment ! regards Karel _____ Van: DreamTelescopes@yahoogroups.com [mailto:DreamTelescopes@yahoogroups.com] Namens Jim & Pat Fly ...
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Karel Teuwen
karel_teuwen
Sep 9, 2010 6:33 pm
Hi Mel, At first, thanks for the nice comment om my M33 ! Those two NB images are showing a lot of fine details, great work !! Since yesterday the ASA mount is...
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melhelm
Sep 9, 2010 3:57 pm
Hello all: Here are few new images from the 16" Dream... The Soap Bubble: http://www.pbase.com/melhelm/image/127778444/large The Wizard:...
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melhelm
Sep 9, 2010 3:47 pm
That's a great (deep) M33! Looks like your set-up is working well. Mel...
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Jim & Pat Fly
jafly1
Sep 9, 2010 1:18 pm
Very Nice Karel! I put it on my desktop. :-) Regards, Jim Fly CATSEYE Collimation ... From: Karel Teuwen To: DreamTelescopes@yahoogroups.com Cc: 'Karel...
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Karel Teuwen
karel_teuwen
Sep 9, 2010 1:12 pm
Hi everyone, I have tried to capture M33 many times before and I was never fully satisfied about the result. I find M33 one of the most difficult targets to ...
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david.fitzhenry
Sep 5, 2010 12:31 pm
That is a stunning image Karel! Beuatiful work seamlessly stitched together, stars sharp across the entire mosaic and great detail and colour in the nebula!...
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Dream Telescopes & Ac...
dreamscopes03
Aug 26, 2010 9:06 pm
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Dream Telescopes & Ac...
dreamscopes03
Aug 25, 2010 5:18 pm
David, I've spent a lot of time writing to individuals over the years but those responses are only read by one person. I requested David post his questions so...
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david.fitzhenry
Aug 25, 2010 11:22 am
Hello all, I've just taken delivery of a custom made Dream Telescopes tube (16"OD) and had a couple of questions that Shane asked me to share on the forum. FYI...
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melhelm
Aug 23, 2010 11:25 pm
Hi Karel: Now I understand. Yes I agree with you. I would not expect 10-20 arc-secs in one minute. Is it consistent? Try slewing back and forth to the same...
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Karel Teuwen
karel_teuwen
Aug 23, 2010 10:24 pm
Sorry for misunderstanding me, it is probably due to my bad English. I'm syncing to a star when it is centered, than imediatelly go to another place on the...
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melhelm
Aug 23, 2010 8:30 pm
Hi Karel: I can't see how the corrector has anything to do with this??? So, you are syncing on a star, slewing to another part of the sky, then slewing back to...
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Karel Teuwen
karel_teuwen
Aug 23, 2010 7:30 pm
Shane, I will read your answer more carefully later but this is already what I can tell you : In my image you were talking about the spikes and how they are...
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melhelm
Aug 23, 2010 6:17 pm
Hi Karel: I use the Lodestar (2X2 bin) and it works well. The problem Shane my be referring to has to do with Maxim. For unclear reasons, Maxim can be...
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Dream Telescopes & Ac...
dreamscopes03
Aug 23, 2010 6:16 pm
Karel, I can tell you from seven years of experience with these fast telescope systems, if something is moving, it will show up off-axis in your images. I can...
52
Dream Telescopes & Ac...
dreamscopes03
Aug 23, 2010 5:40 pm
Karel, The OAG and my 4" adaptor that is bolted to the PDF focuser have an interference problem that I was not aware of until more recent. I've been working...
