Go Back   IceInSpace > Beginners Start Here > Beginners Astrophotography

Reply
 
Thread Tools Rate Thread
  #1  
Old 07-09-2019, 11:29 AM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
NGC300 Galaxy in Sydney with 6Ē newt

I was probably stupid or desperate last night trying to Image a dim Galaxy with my little 6Ē f6 newt under a 50% waxing moon and Sydney Bortle 8 skies plus a 35km/hr westerly wind but here it is anyway
NGC300
32 x 2 minute dithered guided subs
15 x darks
6Ē f6 Bintel newt on a HEQ5 mount
Canon 600D with Baader coma corrector
Had my little home made DSLR cooling fan running and sensor temperature went from 22 deg C at the start down to 16 deg C , stayed around 16 to 18 all night ( hopefully it will help during summer nights )
PHD2 guiding ( 1.50 to 1.80 arc sec error , dithering was knocking the guiding around a lot and took up to 1 minute to fully recover even increasing the Dither settle to 0.65 )
Stacked in DSS
Processed in Startools
Subs didnít even show anything , just a bit of the core
Heaps of noise
Focus was out to blazes
Larger stars hex looking probably due to focus
Lucky to get any sort of image at all !!
Thanks for looking , bad comments welcome
Attached Thumbnails
Click for full-size image (F7AC42C3-E296-4BA6-8C63-B37368399D94.jpg)
190.5 KB71 views
Reply With Quote
  #2  
Old 07-09-2019, 11:55 AM
ChrisV's Avatar
ChrisV (Chris)
Registered User

ChrisV is offline
 
Join Date: Aug 2015
Location: Sydney
Posts: 1,222
Nice. Me had madness last night also and did some imaging in Sydney. Pretty bouncy
Reply With Quote
  #3  
Old 07-09-2019, 12:29 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 781
I think we all have nights like that where everything is saying donít bother and yet we still do. I guess thatís the fun of the addiction. Iím interested in this DSLR cooing fan you speak of. Care to share your idea ? Now that the weather is on the up, Iím sure it will be a hot topic ( pardon the pun ) again.
Reply With Quote
  #4  
Old 07-09-2019, 01:48 PM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Ryan
Photos attached of my 6Ē f6 newt and DSLR with Cooling Fan
60mm high efficiency mini axial fan on aluminium bracket with rubber bushes to dampen vibration. Runs quite well minimum vibration and noise
Itís only been tested twice in cooler nights and reduced the sensor temperature up to 5 deg C ( outside air temp around 13 to 15 deg C )
Donít know if it will perform the same during the summer months
Time will tell
Martin
Attached Thumbnails
Click for full-size image (9C343072-2C2A-48F8-ADA8-DF8918CBFF50.jpeg)
112.1 KB31 views
Click for full-size image (D8038DDE-436F-4BB4-B553-9E66E9D2EF43.jpeg)
103.0 KB31 views
Click for full-size image (E57C6ADA-FC1D-4B3F-A7AA-6D8D4E0D601A.jpeg)
99.7 KB32 views
Reply With Quote
  #5  
Old 07-09-2019, 02:04 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 781
Quote:
Originally Posted by Startrek View Post
Ryan
Photos attached of my 6Ē f6 newt and DSLR with Cooling Fan
60mm high efficiency mini axial fan on aluminium bracket with rubber bushes to dampen vibration. Runs quite well minimum vibration and noise
Itís only been tested twice in cooler nights and reduced the sensor temperature up to 5 deg C ( outside air temp around 13 to 15 deg C )
Donít know if it will perform the same during the summer months
Time will tell
Martin
Nice Martin. Iíve been thinking about doing a similar thing but my camera doesnít have an articulated screen so the screen is in the way of getting the cooling close to the sensor. Iím assuming the fan blows toward the camera and hence the air gap ? Iím wondering if in my situation I may be best to mount a fan closer and have it moving air away from the camera to extract heat ? 5 degrees is 5 degrees though so well done, it will certainly help you go deeper into spring if nothing else.
Reply With Quote
  #6  
Old 07-09-2019, 02:31 PM
xelasnave's Avatar
xelasnave
Gravity does not Suck

xelasnave is offline
 
Join Date: Mar 2005
Location: Tabulam
Posts: 12,789
Great work Martin and nice to have something to take my mind off things.
I have a Peltier device that you can have if it is of any help. Basically you put the camera in a little box..I was going to make one ( I have made a couple in the past) but I have given up on the idea hence my offer.
You can make a platform of ply and use foam for the rest. I think if you have all the camera in a box that is cooled you may get a small advantage as opposed to just bolting the Peltier unit to the base of the camera. They are energy hungry however.
Anyways you did well and desperate and stupid can have you doing things many won't try..sometimes you get a good outcome others nothing more than a realisation that you have been desperate and stupid...
Thanks for providing something to look at to fill my rest period.
Alex
Reply With Quote
  #7  
Old 07-09-2019, 02:42 PM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Ryan
Yes the fan is blowing into the sensor area, you wouldnít achieve anything extracting air
I was going to use an 80mm fan but chose the 60mm to start with. If it works during the summer months , I might fit an 80mm and see if thereís any improvement

Alex
Thanks for the offer of the peltier cooler but Iím maxed out with weight on my 6Ē thatís why I went for just a fan , it only weighs ( including bracket , bushes and fixings about 90 to 100gms

If I can reduce up to 5deg C then I have achieved a lot with such a simple light weight solution

Glad you like the set up , I like tinkering with stuff, been like that since I was a 10 year old kid with my first toy electronics kit ( made a crystal radio set )

Martin
Reply With Quote
  #8  
Old 07-09-2019, 03:12 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 781
Quote:
Originally Posted by Startrek View Post
Ryan

Glad you like the set up , I like tinkering with stuff, been like that since I was a 10 year old kid with my first toy electronics kit ( made a crystal radio set )

Martin
Me too Martin. I made this distribution box for my scopes to reduce the cabling thatís dangling down from the OTA. Thereís only 2 cables ( power and guide ) that go to the box. It then has 2x 7.6v regulated ports for my DSLR and Guider. 2x USB ports that I use for my dew straps. 1 x 12v port for my mirror fan. RJ12 and RJ45 ports for guide controller and guiding cable. All of the OTA wiring can then be nice and short and tidy and can be left connected even when I remove the OTA from the mount. It makes setup quick and easy in the dark too.
Attached Thumbnails
Click for full-size image (B67A49E5-69FD-4015-A1BE-A322C1D13128.jpg)
177.9 KB14 views
Reply With Quote
  #9  
Old 07-09-2019, 04:22 PM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Great idea Ryan !

I made outdoor workstations for my 6Ē F6 newt ( Sydney)and 8Ē f5 newt ( Narrawallee South coast ) to house my laptop complete with 2 x 12v power supplies, mains power board, USB hub etc..
I use a drum stool to sit and power up, Goto , frame , focus and set my capture plan , set my guiding etc.. and then go inside and have a beer
Laptop table was $30
Plastic tub was $ 50
Drum stool was $30
Bits and pieces $ 40
Weather Cover $20
I got the idea from Trevor Jones Astrobackyard
Cheers
Martin
Attached Thumbnails
Click for full-size image (1BB78997-499E-451D-AD6D-506C5F3132F6.jpeg)
143.3 KB19 views
Click for full-size image (05B39E60-5A35-4C2A-B3C7-6C52B534A2FC.jpeg)
157.9 KB19 views
Reply With Quote
  #10  
Old 07-09-2019, 04:45 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 781
Nice clean setup Martin . Iím also a big fan of Trevorís work.

If I might suggest something ? You can get a short counterweight extension bar from Astroanarchy. That way you can put a counterweight right down the end of the bar and probably get away with just one reducing the overall weight of your setup. I used to used just one and not all the way down on my R130sf and it balanced perfectly. Now with the 8Ē Newt and the C9.25, Iím back to using both.
Reply With Quote
  #11  
Old 07-09-2019, 05:24 PM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Ryan
Thanks for the advice
Those photos are 5 months old
Iíve already used my extension bar from the EQ6-R mount to test the HEQ5 mount and its balanced much better now , guiding better too
So I ordered one for the HEQ5 from Bintel
Arrives in a month
Cheers
Reply With Quote
  #12  
Old 08-09-2019, 07:20 AM
mynameiscd's Avatar
mynameiscd (Andy)
Registered User

mynameiscd is offline
 
Join Date: Jan 2017
Location: Langkoop, Victoria
Posts: 326
Great image Martin especially in adverse conditions.
Good to see that again you can get really dim objects in suburban light pollution areas.
I seem to get those nights here lately but because of my setup time i choose the couch over facing the wind, cloud, dew, and fog (usually in one night).
Great workstation you have, its something I've thought of but never got around to.
I normally setup about 80 metres from the house over rough ground so its backward and forward to the house many times to get everthing out there.
Looks like a good idea to simplify my setup and and make some sort of trolley workstation with tyres.
Also like the cooling fan idea. Probably not an issue at the moment as nights are are normally under 7 degrees but for summer it be handy.
Keep those images coming, its keeps my enthusiasm up.
Cheers
Andy
Reply With Quote
  #13  
Old 08-09-2019, 08:04 AM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Ryan
I noticed you mentioned about removing a counterweight to lessen the overall weight. As far as Iím aware Sky-Watcher mount payload ratings do not include the counterweights.Also reading a lot of threads on CN, having your counterweights closer to the mount is better for tracking due to moment of inertia and improving the centre of mass when balancing, pushing them down the end of a long extension bar and removing one is not recommended unless your payload is maxed out
Only reading lots of posts about it

Andy
Thanks so much
Thereís good nights , great nights and tough nights
This image was a tough night , thatís what makes the hobby so challenging
And yes I love my little workstation ( my engine room )

Thanks All !!
Reply With Quote
  #14  
Old 08-09-2019, 08:34 AM
assbutt94
Registered User

assbutt94 is offline
 
Join Date: May 2018
Location: Sydney
Posts: 80
Good effort Martin. I walked outside at 7 and it was calm and clear so i started setting up only for the wind to pick up again so i packed up.
I love the fan on the back of the camera. Ive removed all the rubber grips and image with the usb/cable port covers unplugged, but was curious if it would be worth actively cooling somehow. Going by your 5* drop i might give it a go.
Ryan, that distribution box is great, i might look into making one myself.

I try keep the counterweights as close to the top of the bar as possible, the extra counterweight weight doesnt matter since you are balancing weight either side of the pivot point and it should be more or less equal, so its no extra effort for the mount. A longer bar can flex bounce and sway more though. Does this make much difference? Who knows? Not me!
Reply With Quote
  #15  
Old 08-09-2019, 04:53 PM
RyanJones
Registered User

RyanJones is offline
 
Join Date: Jun 2018
Location: Melbourne,Australia
Posts: 781
Quote:
Originally Posted by Startrek View Post
Ryan
I noticed you mentioned about removing a counterweight to lessen the overall weight. As far as Iím aware Sky-Watcher mount payload ratings do not include the counterweights.Also reading a lot of threads on CN, having your counterweights closer to the mount is better for tracking due to moment of inertia and improving the centre of mass when balancing, pushing them down the end of a long extension bar and removing one is not recommended unless your payload is maxed out
Only reading lots of posts about it
Thanks All !!
I understand what youíre saying and for the most part I agree with both Nathan and yourself. Both arguments I would have thought deal just with rotational balance and inertia. My argument would then be that at the fulcrum there is gravity acting as a downward force the bearing surfaces. This causes friction. Surely the least overall mass you can apply is this direction the better ? I could be talking a load of tripe but thatís just how I thought about it and Iím happy to be corrected.
Reply With Quote
  #16  
Old 08-09-2019, 05:52 PM
Outcast's Avatar
Outcast (Carlton)
Still a Noob....

Outcast is offline
 
Join Date: Oct 2008
Location: Cairns, Qld
Posts: 516
Quote:
Originally Posted by Startrek View Post
Had my little home made DSLR cooling fan running and sensor temperature went from 22 deg C at the start down to 16 deg C , stayed around 16 to 18 all night
Nice result considering what you were up against

I'm intrigued by your home made DSLR cooling fan, can you share details please?

Edit: disregard Martin, just saw the pics... hadn't got that far... reading whilst doing my job...lol

Is that just a CPU fan?

Cheers

Last edited by Outcast; 08-09-2019 at 06:15 PM.
Reply With Quote
  #17  
Old 08-09-2019, 08:54 PM
Startrek (Martin)
Registered User

Startrek is offline
 
Join Date: Dec 2017
Location: Sydney
Posts: 1,461
Carlton
Thanks for your comments
I bought the 60mm fan from Jaycar Electronics so I guess itís a fan for a PC
I soldered a 2m 12v cigarette plug cord to the fan wires and slipped some pvc tubing over the joint
Itís plugged into one end of a 2 way 12v cigarette plug adapter below my mount
Iíll see how it performs during warmer nights and based on that I may upgrade to an 80mm fan
Cheers
Reply With Quote
  #18  
Old 09-09-2019, 11:12 AM
Outcast's Avatar
Outcast (Carlton)
Still a Noob....

Outcast is offline
 
Join Date: Oct 2008
Location: Cairns, Qld
Posts: 516


Quote:
Originally Posted by Startrek View Post
Carlton
Thanks for your comments
I bought the 60mm fan from Jaycar Electronics so I guess itís a fan for a PC
I soldered a 2m 12v cigarette plug cord to the fan wires and slipped some pvc tubing over the joint
Itís plugged into one end of a 2 way 12v cigarette plug adapter below my mount
Iíll see how it performs during warmer nights and based on that I may upgrade to an 80mm fan
Cheers
Reply With Quote
  #19  
Old 11-09-2019, 01:37 AM
Ant0nio's Avatar
Ant0nio (Tony)
Quid Clarius Astris

Ant0nio is offline
 
Join Date: Apr 2018
Location: Gympie,Qld. Australia
Posts: 173
Not stupid Alex, just a little bit addicted like the rest of us. My defence would be the testing of your cooling apparatus
Cheers,
Tony
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 12:51 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
OzScopes Authorised Dealer
Advertisement
Meade Australia
Advertisement
NexDome Observatories
Advertisement
Lunatico Astronomical
Advertisement
SkyWatcher Australia
Advertisement
Celestron Australia
Advertisement
Astronomy and Electronics Centre
Advertisement