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FORUMS Photography Talk by Genre Astronomy & Celestial Talk 
Thread started 08 Feb 2014 (Saturday) 05:24
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Barn Door Tracker

 
Kena
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Feb 17, 2014 10:53 |  #46

Thanks Stu.
XP it is mainly with the bigger lens combination. I am just trying to cover all bases.
This is what I've been working on today. It's not fastened on yet, only balanced to give you some idea.

IMAGE: https://farm4.staticflickr.com/3760/12592386485_b6f62702f6_c.jpg
IMAGE LINK: http://www.flickr.com/​photos/k3na1/125923864​85/  (external link)

IMAGE: https://farm3.staticflickr.com/2881/12592386145_effcbd186a_c.jpg
IMAGE LINK: http://www.flickr.com/​photos/k3na1/125923861​45/  (external link)

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967stuart
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Feb 17, 2014 13:22 |  #47

Ah gotcha, looks like you've made a good start on it.




  
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Kena
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Feb 18, 2014 12:15 |  #48

Glued and screwed into place. I used a zinc coated 50mm square steel washer from B&Q to support the ball head. It came with a centre 10mm hole. I drilled 4 small holes into it to screw it to the top of the new support. My apologies for the quality of pics, taken with my iPhone.

IMAGE: http://farm6.staticflickr.com/5545/12617186735_aacf8ebf27_c.jpg
IMAGE LINK: http://www.flickr.com/​photos/k3na1/126171867​35/  (external link)

IMAGE: http://farm4.staticflickr.com/3794/12617299193_fcb9947912_c.jpg
IMAGE LINK: http://www.flickr.com/​photos/k3na1/126172991​93/  (external link)

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xpfloyd
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Feb 18, 2014 14:52 |  #49

Looks good ken, nice mod. Hopefully will get mine started soon.


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967stuart
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Feb 19, 2014 09:06 |  #50

Looking good there Ken, how's the balance with the cam attached?




  
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xpfloyd
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Feb 19, 2014 09:25 |  #51

And im underway. Purchased the arduino, the motor, 2x 500mm long M5 brass rod and the gears.

Expect lots of questions soon :D


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Kena
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Feb 19, 2014 09:36 |  #52

967stuart wrote in post #16701274 (external link)
Looking good there Ken, how's the balance with the cam attached?

I haven't had the time to try it yet with the camera attached. I tried to keep everything vertical to keep the centre of gravity vertical.

XP no problems, I'm happy to answer any questions you may have.


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Kena
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Feb 20, 2014 15:20 |  #53

Did some more testing tonight with the new modification in place. Managed about half an hour before the clouds rolled in. Used the 24-70 L F2.8 lens this time to get some wide field shots. Nothing spectacular, just testing the tracking abilities. I have done a quick edit with these 2 images in photoshop.

The Plough/Ursor major
2 min exposure at 35mm, Iso 800, F5.6

IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR


Cassiopaei (in there somewhere )
5 min exposure at 35mm, Iso 800, F5.6
Some very slight trailing in this image when zoomed in.
IMAGE NOT FOUND
IMAGE IS A REDIRECT OR MISSING!
HTTP response: NOT FOUND | MIME changed to 'image/gif' | Redirected to error image by FLICKR

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StarBlazer
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Feb 22, 2014 02:02 as a reply to  @ Kena's post |  #54

Fantastic thread Ken. I have dreamed of a barn door since I was a child, but have always thought it far too complicated. You have taken my alibi away :cool:

A couple of thoughts...
- While testing, trails are longer the further you go from the pole. From your latitude you should be able to hook onto Orion at this time of year; that will magnify any trailing compared to Cassiopeia or the Plough. Should also give more rewarding quick win results.
- Your first pics at 300mm looked almost perfect (focussing aside), so I would assume the trailing with Cassiopeia was more likely due to alignment on the second night?
- I can almost envisage adding a small webcam to a finder on the platform and feeding autoguiding pulses through Arduino.

Looking forwards to seeing more from you (and Xp's version too).

Thanks for documenting this,
Eros


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Kena
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Feb 22, 2014 03:42 |  #55

Glad to have quashed the myth StarBlazer. I found it a very interesting little project. I made it using only the tools I had around the house. I have no workshop or bench, only hand saws and tools. Interesting thought about the webcam but with my limited knowledge of electronics and programming I doubt I would succeed. When I started this project I knew absolutely nothing about either. With regards to Orion, I had thought of doing this as it's very clear to the south but unfortunately I would have to go out into the street where there are loads of sodium streetlights. My rear garden is north facing and very dark, or so I thought. You can see from the first 3 images the amount of light pollution picked up from what I thought was almost pitch black.
I am new this astro stuff and still have a long way to go and an awful lot to learn.
I have a classified dark sky sight about one hours drive away, Keilder observatory, and I'm hoping to get up there soon depending on the weather.


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xpfloyd
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Feb 22, 2014 08:02 |  #56

Ken, my components arrived today. There is one bit I couldn't work out on your photos and was waiting until my parts arrived to see if I could work it out. Where the M5 brass rod passes through the 64 tooth cog what is used to attach the two parts? Is it a threaded insert of some sort?

Also, everything is much smaller than I had imagined from the pics. (not that that is a bad thing). The arduino seems like a cool piece of kit.


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Kena
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Feb 22, 2014 08:51 |  #57

I used one of these

http://www.ebay.co.uk …&var=&hash=item​1e76ca3aa4 (external link)

You need size M5. It won't fit straight into the bore of the large gear. I had to file the bore larger with a small rounded file. Be careful not to over do this or the bore will become too big. Patience is required here, I just filed a bit at a time until I got a tight fit. When inserting I threaded it onto a piece of rod and pulled it into place. Once inserted cut the end T off. I then glued it in place.

Yes everything is very small but that helps keep the weight and size down I suppose.


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Feb 22, 2014 09:53 |  #58

Thanks Ken, part now ordered.


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Feb 26, 2014 00:46 |  #59

Lookin good, you will find that without a declination axis, field derotation sets in after a certain amount of time. It looks like 300 seconds or 5 minutes is just pushing past the point where the field is beginning to shift.


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Feb 26, 2014 08:12 |  #60

Wes, field rotation is an effect of a lack of accurate Right Ascension alignment (the offset of your location in relation to the earths axis of rotation). The declination is irrelevant in tracking with a properly aligned RA axis.
All equatorial mounts track only in RA. Autoguiding systems will interact with the declination motors to adjust for errors in alignment.
Theoretically, a perfectly accurate barn door mount can track 24x7 with no field rotation.


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