new scope for the farm

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yobbo89 Australia
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new scope for the farm

#1

Post by yobbo89 »


my boss kindly gave me his meade etx 90 that he has had in storage for probably about 10-15 years. i think the model is from 2005.

he isn't into astronomy, this was a xmas gift that he coudn't get working due to low knowledge of astromomy .i already have a large range of toys but more the merrier .

hmm.. moon mosiac ? guide scope ? maybe a barlow deep sky for targets like the homunculus cloud in catrina or maybe image the iss. btw i apreciat if anyone can exlain to me why the front small secondary looks like a mirror when viewing the front ,it's my first maksutov scope.
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Last edited by yobbo89 on Tue Sep 01, 2020 4:31 pm, edited 1 time in total.
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#2

Post by pakarinen »


Nice score! Maks use a silver "dot" / "spot" on the corrector plate instead of a secondary mirror like an SCT. That's why they're collimated by moving the primary in back.
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Re: new scope for the farm

#3

Post by Ylem »


Nice, I love my 90mm Mak :)
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Re: new scope for the farm

#4

Post by notFritzArgelander »


The silver spot is because its a Gregory Maksutov design. A Rumak Maksutov with have a separate secondary like an SCT. Generally Gregory Maksutovs are slower in order to enable the trick of having the corrector plate double as the secondary,
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: new scope for the farm

#5

Post by yobbo89 »


pakarinen wrote: Tue Sep 01, 2020 4:15 pm Nice score! Maks use a silver "dot" / "spot" on the corrector plate instead of a secondary mirror like an SCT. That's why they're collimated by moving the primary in back.
so a maksutov secondary is just a small section of coated aluminized spot on the inside of the corrector plate rather then a coated secondary mirror like an sct ?
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#6

Post by yobbo89 »


ok, parabolic, typicaly scopes at f4, f5, and a little flat on the edges ,spherical at longer focal lengths more round figure . ok aspherical, hah, what does that look like ??
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#7

Post by yobbo89 »


would ahh an corrector plate count as an aspherical lense ?
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#8

Post by notFritzArgelander »


No. All the surfaces in a Gregory Maksutov are spherical. The primary is spherical. The corrector compensates for coma and the plate has two surfaces, both spherical but with very slightly different radii of curvature.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: new scope for the farm

#9

Post by Graeme1858 »


You have a great boss!

Nice looking telescope.

Regards

Graeme
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Re: new scope for the farm

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Post by yobbo89 »


notFritzArgelander wrote: Tue Sep 01, 2020 5:03 pm No. All the surfaces in a Gregory Maksutov are spherical. The primary is spherical. The corrector compensates for coma and the plate has two surfaces, both spherical but with very slightly different radii of curvature.
hmm, do have any good links of information to provid? i'm having some trouble identifying the diference bewten an sct and a maksutov . there is an maksutov with a seconday that's collimaitible ?
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#11

Post by notFritzArgelander »


yobbo89 wrote: Tue Sep 01, 2020 5:45 pm
notFritzArgelander wrote: Tue Sep 01, 2020 5:03 pm No. All the surfaces in a Gregory Maksutov are spherical. The primary is spherical. The corrector compensates for coma and the plate has two surfaces, both spherical but with very slightly different radii of curvature.
hmm, do have any good links of information to provid? i'm having some trouble identifying the diference bewten an sct and a maksutov . there is an maksutov with a seconday that's collimaitible ?
Yes there is. It's a Rutten Maksutov or Rumak. They give refractor like performance. I love my Intes MK66 which is a Rumak.

The Gregory Maksutov is here. https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

The Rumak is here: https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

I also have two sub aperture Maks the VMC110L and the VMC200L and they are like so. https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

The Intes Maks really hold collimation very well. In 16 years of having one I've checked often but only had to recollimate once.

The Russian maks were sights for tanks in the army so they were rather well built.
Last edited by notFritzArgelander on Tue Sep 01, 2020 6:11 pm, edited 1 time in total.
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: AWB 130mm, f5, Z12 f5; Cats: VMC110L, Intes MK66,VMC200L f9.75 EPs: KK Fujiyama Orthoscopics, 2x Vixen NPLs (40-6mm) and BCOs, Baader Mark IV zooms, TV Panoptics, Delos, Plossl 32-8mm. Mixed brand Masuyama/Astroplans Binoculars: Nikon Aculon 10x50, Celestron 15x70, Baader Maxbright. Mounts: Star Seeker IV, Vixen Porta II, Celestron CG5
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Re: new scope for the farm

#12

Post by KingNothing13 »


Wow - nice little toy! Congrats!
-- Brett

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EPs: ES 82* 18mm, 11mm, 6.7mm; GSO 30mm
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Re: new scope for the farm

#13

Post by yobbo89 »


notFritzArgelander wrote: Tue Sep 01, 2020 5:59 pm
yobbo89 wrote: Tue Sep 01, 2020 5:45 pm
notFritzArgelander wrote: Tue Sep 01, 2020 5:03 pm No. All the surfaces in a Gregory Maksutov are spherical. The primary is spherical. The corrector compensates for coma and the plate has two surfaces, both spherical but with very slightly different radii of curvature.
hmm, do have any good links of information to provid? i'm having some trouble identifying the diference bewten an sct and a maksutov . there is an maksutov with a seconday that's collimaitible ?
Yes there is. It's a Rutten Maksutov or Rumak. They give refractor like performance. I love my Intes MK66 which is a Rumak.

The Gregory Maksutov is here. https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

The Rumak is here: https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

I also have two sub aperture Maks the VMC110L and the VMC200L and they are like so. https://en.wikipedia.org/wiki/Maksutov_ ... assegrains

The Intes Maks really hold collimation very well. In 16 years of having one I've checked often but only had to recollimate once.

The Russian maks were sights for tanks in the army so they were rather well built.
very nice, i enjoyed the read on the different types of cassegrain scopes.
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#14

Post by JayTee »


Hi Rob,

Bookmark this link. It is to the bible of all telescope optics: https://www.telescope-optics.net/index.htm

Cheers,
JT
∞ Primary Scopes: #1: Celestron CPC1100 #2: 8" f/7.5 Dob #3: CR150HD f/8 6" frac
∞ AP Scopes: #1: TPO 6" f/9 RC #2: ES 102 f/7 APO #3: ES 80mm f/6 APO
∞ G&G Scopes: #1: Meade 102mm f/7.8 #2: Bresser 102mm f/4.5
∞ Guide Scopes: 70 & 80mm fracs -- The El Cheapo Bros.
∞ Mounts: iOptron CEM70AG, SW EQ6, Celestron AVX, SLT & GT (Alt-Az), Meade DS2000
∞ Cameras: #1: ZWO ASI294MC Pro #2: 662MC #3: 120MC, Canon T3i, Orion SSAG, WYZE Cam3
∞ Binos: 10X50,11X70,15X70, 25X100
∞ EPs: ES 2": 21mm 100° & 30mm 82° Pentax XW: 7, 10, 14, & 20mm 70°

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Re: new scope for the farm

#15

Post by yobbo89 »


JayTee wrote: Wed Sep 02, 2020 12:36 pm Hi Rob,

Bookmark this link. It is to the bible of all telescope optics: https://www.telescope-optics.net/index.htm

Cheers,
JT
thanks.some good reads on there, i saved the link .
scopes :gso/bintel f4 12"truss tube, bresser messier ar127s /skywatcher 10'' dob,meade 12'' f10 lx200 sct
cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7,asi 290 mm
mounts : eq6 pro/eq8/mesu 200 v2
filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, chroma 3nm ha,sii,oiii,nii,rgb,lowglow,uv/ir,Thousand Oaks Solar Filter,1.25'' #47 violet,pro planet 742 ir,pro planet 807 ir,pro planet 642 bp ir.
extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel,tele vue 2x barlow .

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Re: new scope for the farm

#16

Post by helicon »


Nice boss. Congrats on the pick-up Rob.
-Michael
Refractors: ES AR152 f/6.5 Achromat on Twilight II, Celestron 102mm XLT f/9.8 on Celestron Heavy Duty Alt Az mount, KOWA 90mm spotting scope
Binoculars: Celestron SkyMaster 15x70, Bushnell 10x50
Eyepieces: Various, GSO Superview, 9mm Plossl, Celestron 25mm Plossl
Camera: ZWO ASI 120
Naked Eye: Two Eyeballs
Latitude: 48.7229° N
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