what to do to a dob presentation by keith rickard 27 september 2012
TRANSCRIPT
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What to do to a Dob
Presentation by Keith Rickard
27 September 2012
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Cleaning the mirror
Don’t!
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Cleaning the mirror
Yuk!
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Cleaning the mirror
What do you need?
1. Tap water2. Washing-up liquid3. 5 Litres of distilled water4. Cotton wool – preferably surgical5. Vessel large enough to take the mirror6. About an hour of your time
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Removing the mirrorLay the telescope on a flat surface.
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Removing the mirrorLocate the tube fixing screws – note an alignment mark for replacing the cell
Alignment mark
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Removing the mirrorGently withdraw the mirror cell
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Removing the mirror
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Removing the mirrorLocate the mirror fixing brackets
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Removing the mirrorUnscrew and remove the brackets
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Removing the mirrorCarefully remove the mirror from its cell
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Washing the mirrorFill the trough with tap water
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Washing the mirrorPut in a sparing amount of washing-up liquid
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Washing the mirrorSwish the water around to get an even spread of soap
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Washing the mirrorGently place the mirror in the water and leave to soak for about 15 mins
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Washing the mirrorThe mirror should be about 2cm below the surface
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Washing the mirrorGently swish the water across the water for about 5 mins
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Washing the mirrorUse only the weight of a swab of cotton wool to remove stubborn marks
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Washing the mirrorRemove the mirror while getting ready to rinse it
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Rinsing the mirror
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Rinsing the mirrorUse distilled / de-ionised water. This 5L container cost £3.99.
Using this water will mean no marks will be left on the surface of the mirror when it is left to dry
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Rinsing the mirrorAfter rinse and drying the trough, empty the container into it
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Rinsing the mirrorReplace the mirror and swish the water over it
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Drying the mirror
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Drying the mirrorStand the mirror on its end on a towel and let it dry naturally
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Collimation – Newtonian Telescopes
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Collimation – Newtonian Telescopes
This guide describes:
• Technique for visual use only
• Using a laser collimator
Why collimate?
By aligning optics as well as possible improves the performance of the telescope. Newtonians notoriously fall out of collimation very often.
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Collimation – Newtonian Telescopes
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Collimation – Newtonian TelescopesBefore starting…
MAKE SURE THE OPTICAL TUBE IS HORIZONTAL
You don’t want to drop anything onto the primary mirror!
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Collimation – Newtonian TelescopesWhat needs adjustment?
1) Radial position of the secondary mirror
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Collimation – Newtonian TelescopesSecondary sighting tool
A Kodak 35mm film pot is ideal for this purpose!
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Insertion of the secondary mirror
• Orientation of the secondary mirror
Left image shows an insertion and orientation adjustment is required. Right image shows the correct position.
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
Centre spot on primary is required
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Introducing the Laser Collimator
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the secondary
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the primary mirror
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the primary mirror
Adjustment screws
Locking screws
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Collimation – Newtonian TelescopesWhat needs adjustment?
• Collimation of the primary mirror
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Collimation – Newtonian TelescopesIn summary:
• Generally, only the use of the laser collimator is required
• That means collimating the secondary & primary mirrors only
• Generally, I find the secondary needs most attention
• The process takes 1 -2 minutes
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Digital Setting Circles
• They aid rapid pointing of the telescope and to allow the user know where the telescope is pointing
• This set-up is a Push-To arrangement
• Encoders are placed on each axis
• Encoders are connected an interface box
• The interface box is then connected to a computer
• Software on the computer, say a planetarium program, gives the user access to a database of objects to find, etc.
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Digital Setting CirclesThe Altitude Encoder
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Digital Setting CirclesThe Azimuth Encoder
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Digital Setting CirclesThe Interface Box
The Dave Ek Digital Setting Circles printed circuit board - $24.00
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Digital Setting CirclesThe Interface Box
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Digital Setting CirclesThe Interface Box
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Digital Setting CirclesThe Interface Box
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Digital Setting CirclesThe Interface Box
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Digital Setting CirclesThe Interface Box connected to a PC serial port
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Digital Setting CirclesThe Interface Box connected to a Bluetooth serial adapter
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Digital Setting CirclesSoftware – Android Smart Phone
• Sky Safari Plus (cost ~£8.00)
• Massive database of different types of objects
• Contains 2.5 million stars – excellent for zooming in to see the star filed as seen in the eyepiece – makes spotting the object more easy.
• Easy telescope control using
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Digital Setting CirclesSoftware – PC Planetarium
• The software which use ASCOM drivers will work
• Sky Map Pro does
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Digital Setting Circles
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Digital Setting Circles
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The End