Flocking Focuser draw tube

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Don Quixote
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Flocking Focuser draw tube

#1

Post by Don Quixote »

The draw tubes on my fracs are 2" and 2.5".
On my AR152 f/6.5, which has a 2" focuser, I notice some dull light circle coming from the inside of the draw tube when viewed through the diagonal without an EP in place.

I used a smooth sided plastic soda drink bottle, photo mount adhesive, and thin wool felt to flock this tube interior.

I cut the top and bottom from a plastic soda bottle forming a cylinder. I split the cylinder and rolled it to fit in the draw tube. I cut this piece to size so that the rolled plastic expands to fill the inside diameter of the focus draw tube.
I cut a piece of black felt and mounted it to the split plastic cylinder from the soda bottle.

I rolled this mounted black felt, felt to the inside, and installed it through the back of the draw tube with needle nose pliers. Upon releasing the rolled plastic/felt sheet it expanded to the walls of the interior of the focuser draw tube.

I used no adhesive to attach the felt backed cylinder to the tube interior. This device can be removed if I don't find it useful.

Bingo!

Now there is no ring of light in the draw tube when I view through the EP collar on my diagonal.

You may not benefit from this flocking, but in my case it has improved the view.

I tested this in daylight on tree leaves in the back ward. Contrast has been improved.

Testing in daylight I observed that it was easier to come to focus on bright leaves backgrounded by even brighter unfocused distant leaves.

In prior daylight testing in my woods there was some struggle to find best focus between already bright leaves with a bright background.

I do not know the technical details of this difference, but the experience is enough for me.

I am now looking forward to a clear night.

I have attached an image of the ingredients for this project.

PS:
I forgot to mention that the felt sheet is cut 3mm long so that I could fold it back over the edge of the plastic cylinder.
The photo mount adhesive is applied to the felt.
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Resized_20190929_170840.jpeg
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bladekeeper
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Re: Flocking Focuser draw tube

#2

Post by bladekeeper »

Very clever solution, Mark!
Bryan
Scopes: Apertura AD12 f/5; Celestron C6-R f/8; ES AR127 f/6.4; Stellarvue SV102T f/7; iOptron MC90 f/13.3; Orion ST80A f/5; ES ED80 f/6; Celestron Premium 80 f/11.4; Celestron C80 f/11.4; Unitron Model 142 f/16; Meade NG60 f/10
Mounts: Celestron AVX; Bresser EXOS-2; ES Twilight I; ES Twilight II; iOptron Cube-G; AZ3/wood tripod; Vixen Polaris
Binoculars: Pentax PCF WP II 10×50, Bresser Corvette 10×50, Bresser Hunter 16×50 and 8×40, Garrett Gemini 12×60 LW, Gordon 10×50, Apogee 20×100

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Ylem
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Re: Flocking Focuser draw tube

#3

Post by Ylem »

Thanks Mark
Cool thinking 8-)
Clear Skies,
-Jeff :telescopewink:

Orion 127 Mak, ST80
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Gulf Coast Guy
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Re: Flocking Focuser draw tube

#4

Post by Gulf Coast Guy »

Way to get your engineer on. All my focusers are 2" Crayfords. guess I'll be drinkin' more soft drinks.
OTA's: 203mm f10 Meade SCT (LXD75); Antares 80mm Refractor w/William Optics APOGrade f6.9 objective; Orion Starseeker 80 f11.2 Refractor
Mount/tripod's: Meade LXD-75 EQ; Orion Starseeker IV ALT/AZ; Celestron Heavy Duty ALT/AZ Farpoint UBM (Universal Binocular Mount)
Eyepieces:Meade - 26mm plossl, 12mm Astrometric; GSO (OPT badge) 2" Superview 50mm & 30mm 1.25" 15mm; TMB Planetary Series 9mm, 6mm, & 4mm: 10mm & 23mm 60° that came with the 80mm f11.2
Barlows: Orion 2x Shorty; Meade 4000 Series 3x
Binoculars:Brunton 10x50 Celestron Skymaster 15x70 Oberwerk 25x100 IF delux
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Lady Fraktor
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Re: Flocking Focuser draw tube

#5

Post by Lady Fraktor »

A nice modification Mark, I normally just use ultra flat or chalkboard paint in the tube to to get rid of stray lighting.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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John Baars
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Re: Flocking Focuser draw tube

#6

Post by John Baars »

Sorry, I'm late, I just saw this topic.
Marvellous idea!
Telescopes in Schiedam in frequency of use : * SW 150mm Achromat F/5, *SW Evostar 120ED F/7.5, *grabngo: SW 102 Maksutov F/13, *Vixen 102ED F/9, *OMC140 Maksutov F/14.3, on Vixen GPDX.
Most used Eyepieces: *Panoptic 24, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Most often used binoculars: *AusJena 10X50 Jenoptem, *Swarovski Habicht 7X42, *Celestron Skymaster 15X70, *Kasai 2.3X40

Rijswijk Observatory Foundation telescopes: * Astro-Physics Starfire 130 f/8 on NEQ6, * 6 inch Newton on GP, * C8
on NEQ6, * Meade 14 inch SCT on EQ8, *Lunt.

Amateur since 1970.
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Richard
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Re: Flocking Focuser draw tube

#7

Post by Richard »

Yes that is great but as mentioned Chalkboard works especially if the tube is small, Ultra flat not available in lot of places , I got some in RSA but the paint was useless , high price for a normal flat not suitable lots of reflection
Reflectors GSO 200 Dobs , Sky-watcher 10 inch Dobs
Refractors Tasco 10TE-5
SCT C5 on a SLT mount
Mak 150 Bosma on a EQ5
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John Baars
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Re: Flocking Focuser draw tube

#8

Post by John Baars »

Richard wrote: Mon Feb 17, 2020 3:50 pm Yes that is great but as mentioned Chalkboard works especially if the tube is small,(...)
Quite so. I added the flocking material to the 2 inch focussing-tube of my 150mm f/5 achromat right away. But there are several places in the focusser I used Chalkboard paint. Sometimes there is simply no room for handling the material.
Telescopes in Schiedam in frequency of use : * SW 150mm Achromat F/5, *SW Evostar 120ED F/7.5, *grabngo: SW 102 Maksutov F/13, *Vixen 102ED F/9, *OMC140 Maksutov F/14.3, on Vixen GPDX.
Most used Eyepieces: *Panoptic 24, *Leica ASPH zoom, *Zeiss barlow, *Pentax XO5.
Most often used binoculars: *AusJena 10X50 Jenoptem, *Swarovski Habicht 7X42, *Celestron Skymaster 15X70, *Kasai 2.3X40

Rijswijk Observatory Foundation telescopes: * Astro-Physics Starfire 130 f/8 on NEQ6, * 6 inch Newton on GP, * C8
on NEQ6, * Meade 14 inch SCT on EQ8, *Lunt.

Amateur since 1970.
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