N 130/900 Explorer secondary mirror size?

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turboscrew
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N 130/900 Explorer secondary mirror size?

#1

Post by turboscrew »

Does anyone happen to know the size of the secondary mirror of Skywatcher N 130/900 Explorer (the one with spherical mirror)? I bought such a thing to my grandson who lives 300 km away, and I haven't even seen it myself.

I was thinking of the collimation of the secondary - what size of sight tube would work well.
Senior Embedded SW Designer
Telescope: OrionOptics XV12
Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Eyepieces: 10 mm and 25 mm Kellners, 15 mm TV Plössl, 6 mm Baader Classic Ortho, 26 mm Omegon SWAN 70°
Explore Scientific HR 2" coma corrector
Meade x3 1.25" Barlow
Some filters (#80A, ND-96, ND-09, UHC)

LAT 61° 28' 10.9" N, Bortle 5

I don't suffer from insanity. I'm enjoying every minute of it.

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Lady Fraktor
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Re: N 130/900 Explorer secondary mirror size?

#2

Post by Lady Fraktor »

Why not get a Cheshire eyepiece, then he can use it with any newtonian later on?
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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turboscrew
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Re: N 130/900 Explorer secondary mirror size?

#3

Post by turboscrew »

Hmm, I guess I need to learn how to use Chesire to check the secondary placement.

I was thinking of a capped tube with a small hole that gives an appropriate view angle just a bit bigger than the secondary should appear when the tube is set in the right distance.
Senior Embedded SW Designer
Telescope: OrionOptics XV12
Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Eyepieces: 10 mm and 25 mm Kellners, 15 mm TV Plössl, 6 mm Baader Classic Ortho, 26 mm Omegon SWAN 70°
Explore Scientific HR 2" coma corrector
Meade x3 1.25" Barlow
Some filters (#80A, ND-96, ND-09, UHC)

LAT 61° 28' 10.9" N, Bortle 5

I don't suffer from insanity. I'm enjoying every minute of it.

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User avatar
turboscrew
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Posts: 2103
Joined: Sat Jun 20, 2020 9:22 am
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Re: N 130/900 Explorer secondary mirror size?

#4

Post by turboscrew »

Oh, and I'll get him the same kind of laser that I have, and teach him the barlowed laser way to collimate the primary.
Senior Embedded SW Designer
Telescope: OrionOptics XV12
Mount: CEM120, Tri-pier 360 and alternative dobson mount.
Eyepieces: 10 mm and 25 mm Kellners, 15 mm TV Plössl, 6 mm Baader Classic Ortho, 26 mm Omegon SWAN 70°
Explore Scientific HR 2" coma corrector
Meade x3 1.25" Barlow
Some filters (#80A, ND-96, ND-09, UHC)

LAT 61° 28' 10.9" N, Bortle 5

I don't suffer from insanity. I'm enjoying every minute of it.

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