The ST102 Never-ending Story ...

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Shorty Barlow
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The ST102 Never-ending Story ...

#1

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I recounted a long time ago, in a forum far, far away, that in January 2018 I bought a Sky-Watcher ST102 StarTravel as an inexpensive rich field grab'n'go scope.

Image

Although I originally intended to use it on a Vixen Porta II/SXG Hal-130 tripod combination I discovered it would easily balance well on my Sky-Watcher AZ5. This made it even more of a grab'n'go scope for me. I never used it as stock and replaced its original focuser with a dual speed heavy duty TS Optics (GSO) rotating Crayford-rail focusing unit virtually the same as on my modified ST80's.

Image

This was fine and worked really well after I added twin finder shoes, a Baader adapter, and sorted out all of the back or in-focusing problems and suitable accessories etc.

Image

However, early last year I started experimenting with actually rotating the focuser. I'm physically disabled so this function can make life a lot easier for me, especially with a heavy 2” diagonal and eyepiece. After a while I noticed that the focuser was often less smooth and sometimes distinctly rough to turn. It was almost as if something internally was 'grinding' and causing friction. Even Guan Sheng Optical are surprisingly candid about the rotation capabilities of their focusers.

4. 360-degree Rotation

These focusers are rotatable, i.e., you can turn the entire focuser body/diagonal/eyepiece combination into a better observing position by loosening or tightening a large silver thumbscrew on the top of the focuser. However, please note that this is a relatively weak feature of this otherwise excellent product. We inspect every single focuser and tweak/lube it as much as we can, but the rotation is often not smooth over the entire 360-degrees and may bind in a few spots, requiring additional effort to rotate it. This is probably a minor annoyance since most people will not use this feature very often.

~ Manufacturer's description.

The trouble is I'm not 'most people' and after a while I had found this feature virtually indispensable. I had actually noticed the 'minor annoyance' of the uneven rotation early in use but initially dismissed it. However the 'grinding' happened with the focuser knob itself and I could even feel it through the fine focus knob. It seemed related to the rotation angle but was oddly sometimes just as smooth as it always was. I believe that it was related to the way the actual mechanism works. The rotating part of the focuser seemed to sag somewhat when the rotation knob is loosened and I think at certain angles the clutch plate didn’t always connect back properly when re-tightened. In retrospect I now believe this to be an inherent design flaw. It's intriguing, if slightly perplexing, that GSO are quite open about it being a weakness.

Image

Fortunately Sky-Watcher focusers are now equipped with finder shoe holes, which is a bit of a deal breaker for me. So I removed the TS Optics focuser and replaced it with the dual speed Sky-Watcher Crayford equivalent. I’m not totally positive but there is a good chance these are manufactured by Long Perng. They seem to have an excellent reputation.

Image

There is a definite improvement in rotation. The rotating part of the focuser doesn't sag when the rotational screw is loosened and the mechanism seems as smooth as the focuser on my Altair Starwave. There is only one large set screw to hold the diagonal however, unlike the usual pair of screws on 2” focuser units. The one screw seems capable enough although I managed to obtain a second and use both.

Image

The focal plane has now changed as the new focuser is physically longer (132mm + 80mm when draw tube fully extended). This did initially cause occasional in-focusing problems with some eyepiece and diagonal combinations. This was essentially remedied by trial and error. In fact I even thought that the focusing itself was smoother and more precise.

Image

The main thing is that it still fits into my grab’n’go bag lol.
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#2

Post by Bigzmey »

Yes, between the focuser tube sagging and grinding the rotation option is poorly executed on GSO focusers. They can get away with that because there are no alternatives (at least here in US) for focuser replacement in the same price range.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1635, S110: 77). Doubles: 1385, Comets: 18, Asteroids: 95
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Re: The ST102 Never-ending Story ...

#3

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Bigzmey wrote: Thu Jan 30, 2020 7:30 pm Yes, between the focuser tube sagging and grinding the rotation option is poorly executed on GSO focusers. They can get away with that because there are no alternatives (at least here in US) for focuser replacement in the same price range.

The funny thing is that the SW was 50 quid cheaper for me lol.
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#4

Post by Bigzmey »

Shorty Barlow wrote: Thu Jan 30, 2020 7:33 pm
Bigzmey wrote: Thu Jan 30, 2020 7:30 pm Yes, between the focuser tube sagging and grinding the rotation option is poorly executed on GSO focusers. They can get away with that because there are no alternatives (at least here in US) for focuser replacement in the same price range.

The funny thing is that the SW was 50 quid cheaper for me lol.
Nice find SB! Unfortunately, many SW products are not available in US.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1635, S110: 77). Doubles: 1385, Comets: 18, Asteroids: 95
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Re: The ST102 Never-ending Story ...

#5

Post by Shorty Barlow »

Bigzmey wrote: Thu Jan 30, 2020 8:04 pm
Shorty Barlow wrote: Thu Jan 30, 2020 7:33 pm
Bigzmey wrote: Thu Jan 30, 2020 7:30 pm Yes, between the focuser tube sagging and grinding the rotation option is poorly executed on GSO focusers. They can get away with that because there are no alternatives (at least here in US) for focuser replacement in the same price range.

The funny thing is that the SW was 50 quid cheaper for me lol.
Nice find SB! Unfortunately, many SW products are not available in US.
That's because the Synta Technology Corporation was founded in 1980 in Taiwan by David Shen and originally marketed as Sky-Watcher to Asia and Commonwealth countries. David Shen's dream was to make affordable good quality scopes for the whole world, or at least Asia and Commonwealth countries (Suzhou Synta Optical Technology Co., Ltd was started with some capital from Canadian investment). However, Synta manufactured products for US distributors like Orion, so I'm guessing there are anti-trust issues with SW selling directly to the US market.
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#6

Post by Bigzmey »

Shorty Barlow wrote: Thu Jan 30, 2020 8:56 pm
Bigzmey wrote: Thu Jan 30, 2020 8:04 pm
Shorty Barlow wrote: Thu Jan 30, 2020 7:33 pm


The funny thing is that the SW was 50 quid cheaper for me lol.
Nice find SB! Unfortunately, many SW products are not available in US.
That's because the Synta Technology Corporation was founded in 1980 in Taiwan by David Shen and originally marketed as Sky-Watcher to Asia and Commonwealth countries. David Shen's dream was to make affordable good quality scopes for the whole world, or at least Asia and Commonwealth countries (Suzhou Synta Optical Technology Co., Ltd was started with some capital from Canadian investment). However, Synta manufactured products for US distributors like Orion, so I'm guessing there are anti-trust issues with SW selling directly to the US market.
Well, the distribution is strange and spotty. Premium SW APO/ED refactors are present in US as well as some random mounts and scopes. But some products are missing. You can get 120mm and 80mm F5 achros from Orion, but 100mm and 150mm F5 achros are not offered by Orion or SW. You can get AZGti mount here, but SkyTee2 is not offered, I had to ship it from Germany.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1635, S110: 77). Doubles: 1385, Comets: 18, Asteroids: 95
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Re: The ST102 Never-ending Story ...

#7

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Bigzmey wrote: Thu Jan 30, 2020 9:06 pm
Shorty Barlow wrote: Thu Jan 30, 2020 8:56 pm
Bigzmey wrote: Thu Jan 30, 2020 8:04 pm

Nice find SB! Unfortunately, many SW products are not available in US.
That's because the Synta Technology Corporation was founded in 1980 in Taiwan by David Shen and originally marketed as Sky-Watcher to Asia and Commonwealth countries. David Shen's dream was to make affordable good quality scopes for the whole world, or at least Asia and Commonwealth countries (Suzhou Synta Optical Technology Co., Ltd was started with some capital from Canadian investment). However, Synta manufactured products for US distributors like Orion, so I'm guessing there are anti-trust issues with SW selling directly to the US market.
Well, the distribution is strange and spotty. Premium SW APO/ED refactors are present in US as well as some random mounts and scopes. But some products are missing. You can get 120mm and 80mm F5 achros from Orion, but 100mm and 150mm F5 achros are not offered by Orion or SW. You can get AZGti mount here, but SkyTee2 is not offered, I had to ship it from Germany.
Could be more of a supply and demand thing then. I have noticed some weird gaps in the US market with SW mount/tripod combinations.
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#8

Post by Shorty Barlow »

I originally bought the ST102 as an inexpensive achromat, and as a bit of a project.

Sky-Watcher ST102 OTA £170

Aftermarket Dual Speed SW Crayford £139

TS Optics Reflex Sight £72

Baader 2”~1.25” adaptor £27

£408 total (not including the GSO focuser)
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

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This is how they get you! :lol:
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1635, S110: 77). Doubles: 1385, Comets: 18, Asteroids: 95
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Re: The ST102 Never-ending Story ...

#10

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Bigzmey wrote: Fri Jan 31, 2020 12:37 am This is how they get you! :lol:

Yep!
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#11

Post by Shorty Barlow »

The story continues ...

Image

The ST102 was eventually fitted with a MoonLite. This is a really nice focuser and about the same size as the GSO. However, I had some problems with the Allen screws holding the focuser adapter plate to the OTA housing. This was remedied eventually with the judicious use of a pair of pliers to properly tighten the screws. It's also worth pointing out the the screws are not a standard metric size but old-fashioned imperial (3/32).

Image

I had another MoonLite on my 80ED DS Pro for a while, but it had mechanical problems and the SW ended up replacing the second MoonLite.
TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro (SW Rotating Focuser), ST80, ST102 (MoonLite Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II/SXG Hal-130, Vixen Porta II/APP-TL130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: Binoviewer. A shed load of eyepieces including: Antares, Astro Essentials, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Pentax, Sky-Watcher, Solomark, SvBony, Takahashi, TeleVue, Vixen, William Optics & one or two I'm not sure of.

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Re: The ST102 Never-ending Story ...

#12

Post by pakarinen »

Very interesting read, Shorty, thanks. I have a problem with my right shoulder, so sometimes I have to be a bit of a contortionist while observing.

I found a Lunt 2-speed on sale for my ST80, so luckily it wasn't more expensive than the scope. LOL. But I am in the market for a 2-speed for my ST120 and have been looking at GSOs among others.

Re: SW and other products in the US - I ordered my SW AZ5 (mount only) from FLO in the UK since it wasn't available here. It seems some people over on CN get heartburn about ordering from European suppliers, but I have no problem. If they have the honey, they get my money... And FLO has been great.
Make sure you beam down the horn section and set your phasers to Funk Funk.

Orion ST120, Meade AdventureScope ST80, Skywatcher 90mm Mak
Twilight 1 / Astro Devices encoders / Nexus II / Manfrotto 475B tripod / Stellarvue M1V / Skywatcher AZ5
Nikon Aculon 10x50 binos / US Navy 1944 Mark 30 7x50 binos
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Re: The ST102 Never-ending Story ...

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pakarinen wrote: Wed Nov 04, 2020 12:32 pm Very interesting read, Shorty, thanks. I have a problem with my right shoulder, so sometimes I have to be a bit of a contortionist while observing.

I found a Lunt 2-speed on sale for my ST80, so luckily it wasn't more expensive than the scope. LOL. But I am in the market for a 2-speed for my ST120 and have been looking at GSOs among others.

Re: SW and other products in the US - I ordered my SW AZ5 (mount only) from FLO in the UK since it wasn't available here. It seems some people over on CN get heartburn about ordering from European suppliers, but I have no problem. If they have the honey, they get my money... And FLO has been great.
GSO would be the most sensible focuser upgrade for ST120.

I have bought stuff from European vendors and don't believe they are any worse than US. I think the main thing is that if there is an issue with the order (wrong item, defective, item damaged in shipping, missing parts, etc) it could be potentially harder to address. And these things happen on occasion even to very honest suppliers.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" SCT F10, 6" SCT F10, Omni XLT 150R Achro F5, Onyx 80ED F6.3; Meade: 80ST Achro F5.
Mounts: ES: Twilight I; Bresser: EXOS2; SW: SkyTee2, AzGTi; UA: MicroStar.
Binos: Orion: Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68s; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV; Russell Optics: SuperPlossls.
Diagonals: Baader: BBHS silver mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: Positive lock prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1635, S110: 77). Doubles: 1385, Comets: 18, Asteroids: 95
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Re: The ST102 Never-ending Story ...

#14

Post by Greenman »

Hi Shorty, I hope all this has made it easier to use the scope.
Cheers,

Tony.

Image

AP SCT: Celestron NexStar 6SE; Orion RACI 9x500 illuminated finder; Antares 0.63 reducer; Antares 2" Dielectic diagonal.

AP Refractor: Altair Starwave 80ED F7; 1x PlanoStar Flattener; Altair Starwave 0.8 FF/FR; Antares Versascope 60mm finder.

Celestron AVX Mount; Celestron SE6 Mount; Sky portal 2 WiFi; ZWO ASI224MC; SvBony 305; Canon EOS 100 (Unmoded).
X-cel LX eyepieces & Barlows 2x 3x, Celestron 8-24mm Zoom.

Filters: Astronomik IR cut; Baader Semi Apo; Baader Fringe Killer.

Binoculars: Celestron 15 x 70.

Latitude: 52.219853
Longitude: -1.034471
Accuracy: 5 m
Bortle 4 site. https://maps.google.com/?q=52.21985,-1.03447

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