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BKBrown
Post Laureate
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Reged: 08/23/09

Loc: Northern Virginia, USA
Small bore challenge: Jupiter w/ 6" or less
      #5548739 - 12/01/12 12:44 PM Attachment (683 downloads)

Hi folks,

Jupiter reaches opposition this weekend and it won't get any better than this. I would love to see what folks with smaller aperture scopes can do while we have this great opportunity. Here is The King on Friday morning, taken with my SW100ED (4") at f/36. Seeing conditions were only average/fair, but the small refractor still gave a good account of itself. Interested in giving it a go? Good luck!

Clear Skies,
Brian


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AlanL
sage


Reged: 11/11/10

Loc: Kansas, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5548764 - 12/01/12 01:00 PM

Dang, that's impressive for a 4" scope!

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lcd1080
scholastic sledgehammer


Reged: 06/03/10

Loc: Maryland, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: AlanL]
      #5549054 - 12/01/12 04:28 PM

Great job with the small bore Brian! I've got a question about imaging Jupiter with a refractor; I was trying to use a 3x barlow on my 92mm TMB-92L refractor but I couldn't get enough back focus to accomplish that. Do you increase the effective focal length of your refractor with a barlow or with eyepiece projection? How high can you increase the effective focal length of your system?

Pete


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rg55
scholastic sledgehammer
*****

Reged: 08/02/08

Loc: western US
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5549160 - 12/01/12 05:53 PM

Beautiful shot!
What camera?

Edited by rg55 (12/01/12 05:53 PM)


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BKBrown
Post Laureate
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Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: AlanL]
      #5549399 - 12/01/12 09:04 PM

Thanks Alan, Pete, and Richard! Pete - With the SW100ED I use a Barlow to boost the focal length from f/9 to f/27 through f/45...this shot used a Siebert 4x Barlow for f/36. In order to reach focus with your refractor you may need a tube extension - I do. I prefer the ones from Stellarvue.
Richard - This image was taken with an Imaging Source DBK21AU618 (a one shot color camera) and a Baader UV/IR cut filter.

Clear Skies,
Brian


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TerryWood
sage
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Reged: 03/15/12

Loc: USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5549582 - 12/01/12 11:39 PM Attachment (326 downloads)

I'm still very, very new at imaging. Really green. But, this is one I took on Thanksgiving with a Questar 3.5, no barlow, and re-sized.

V/R

Terry


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TerryWood
sage
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Reged: 03/15/12

Loc: USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: TerryWood]
      #5549589 - 12/01/12 11:42 PM Attachment (235 downloads)

And one more.

V/R

Terry


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rg55
scholastic sledgehammer
*****

Reged: 08/02/08

Loc: western US
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5549647 - 12/02/12 12:23 AM Attachment (306 downloads)

Here's my humble contribution:

Edited by rg55 (12/02/12 12:26 AM)


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BKBrown
Post Laureate
*****

Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: rg55]
      #5549780 - 12/02/12 03:38 AM

Nice job Terry and Richard Ya'll coaxed some nice detail out of those images, let's see what else we can get...

Clear Skies,
Brian


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rik ter horst
sage


Reged: 11/01/10

Loc: Ewer, the Netherlands
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5549802 - 12/02/12 04:33 AM Attachment (296 downloads)

Here's my contribution. I used a 130 mm F/11.5 Schmidt-Cassegrain telescope and a 3x barlow to capture this image on the 14th of November. The camera is a DBK21 and I used about 1700 frames. Stacking was done with Autostakkert!2, wavelets with Registax 6 and further processing with Photoshop CS2.
Conditions were fair to good that night.
Cheers,
Rik


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lcd1080
scholastic sledgehammer


Reged: 06/03/10

Loc: Maryland, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5550159 - 12/02/12 11:19 AM

Quote:

In order to reach focus with your refractor you may need a tube extension - I do...




Thanks Brian. How do you calculate the required extension tube length for your barlow/refractor combination? Is there a formula for doing that?

Pete


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BKBrown
Post Laureate
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Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: lcd1080]
      #5550196 - 12/02/12 11:42 AM

Hi Pete,

I am mortally certain there is a formula but I have no idea what it is and did not use it myself. The operational way to tell is to plug in your planet cam and keep racking the focuser in and out until you score focus or see an out-of-focus blob at maximum in or out travel. If you get the blob (most likely at maximum extension) you need a tube extender. You can get them from Orion, TV, AP, Stellarvue and elsewhere; I like the ET3 model from SV: http://www.stellarvue.com/adapters.html, you are looking for something that gives you about 2" extra travel. You will need a 1.25" adapter to receive your nosepiece, I find this centering adapter from Orion does a great job keeping everything tight and properly aligned: http://www.optcorp.com/product.aspx?pid=15747&kw=centering%20adapter&... Hope this helps!

Clear Skies,
Brian


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BKBrown
Post Laureate
*****

Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: rik ter horst]
      #5550202 - 12/02/12 11:45 AM

Great job Rik! Very nice image with lots of good detail; personally I would down scale it by about 25% to 35% for presentation...that is just a personal preference. Thanks for posting

Clear Skies,
Brian


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lcd1080
scholastic sledgehammer


Reged: 06/03/10

Loc: Maryland, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5550333 - 12/02/12 01:19 PM

Thanks again Brian, I rummaged through my box full of accessories and found an extension tube and two adapters, one for a DBK camera and one for a DSLR. Thanks for your detailed answer and for motivating me to look through my accessory box!

Pete





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BKBrown
Post Laureate
*****

Reged: 08/23/09

Loc: Northern Virginia, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: lcd1080]
      #5550458 - 12/02/12 02:32 PM

Your welcome, looks like you have what you need there. Good shooting!

Clear Skies,
Brian


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azure1961p
Postmaster
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Reged: 01/17/09

Loc: USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: BKBrown]
      #5550883 - 12/02/12 07:27 PM

You guys with your small aperture and hidef images are astounding. Times this is some great work.


Pete


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ToxMan
Carpal Tunnel
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Reged: 01/23/11

Loc: Tucson, Arizona, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: azure1961p]
      #5556822 - 12/06/12 02:41 AM Attachment (238 downloads)

Well after seeing this thread, and since I was not having much luck with the C14, I took up the challenge tonight and got a nice widefield shot with 90mm Apex Mak-Cass. Hope you enjoy.

Paul


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Kokatha man
Postmaster
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Reged: 09/13/09

Loc: "cooker-ta man" downunda...
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: ToxMan]
      #5556830 - 12/06/12 02:49 AM

Nice Paul - not sure what exactly defines "small bore" but I was going to set up the 5" apo with the ASI120MC colour cam to see how that fared on Jupiter on a night when/if old Jove cooperates..!

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Kokatha man
Postmaster
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Reged: 09/13/09

Loc: "cooker-ta man" downunda...
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: Kokatha man]
      #5556833 - 12/06/12 02:50 AM

Quote:

Nice Paul - not sure what exactly defines "small bore" but I was going to set up the 5" apo with the ASI120MC colour cam to see how that fared on Jupiter on a night when/if old Jove cooperates..!




.....Duuuhhh!!! I just thread the thread title..!!!


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ToxMan
Carpal Tunnel
*****

Reged: 01/23/11

Loc: Tucson, Arizona, USA
Re: Small bore challenge: Jupiter w/ 6" or less new [Re: Kokatha man]
      #5556837 - 12/06/12 02:59 AM

Your APO qualifies, Darryl. I'd like to see what the new cam does on some other scopes, too.

I've ordered DMK21AU618 before I saw your stunning pics with the new cam. I just couldn't make the old DMK31 work on the C14. I want to try a color CMOS later and see if I can get away from mono everything. Thanks.

Paul


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