90mm Mak

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pakarinen
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#21

Post by pakarinen »

First light - clouds were rolling in, but I was able to spend a little time on Polarus, Sirius, and M41.
Time was limited, so I just mounted it on my Benro tripod and went out the door.

Collimation looks pretty good to me - nice concentric rings. I have astigmatism and my prescription is close to two years old, so even with glasses, I might be off a bit.

M41 looked good, but with that high f-ratio, the FOV clamps down pretty quickly. I didn’t go shorter than 10mm.

Supposed to be clear tomorrow morning, so I’m hoping to get some moon viewing in and maybe Saturn as well as trying it on my TW 1.
Olen Suomalainen!


Orion ST120, Meade AdventureScope ST80, Skywatcher 90mm Mak
Twilight 1 / Astro Devices encoders / Nexus II / Manfrotto 475B tripod
Nikon Aculon 10x50 binos
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Bigzmey
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#22

Post by Bigzmey »

Congrats on the first light Pakarinen! Is that F13.8 Mak? You will find that in comparison to the F5 refractors the EP range is shifted towards longer FL. On a typical night it will be between 14mm and 40mm EPs.
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.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1694 (Completed: M110, H1, H2. In progress: H3: 195, H2,500: 1272, S110: 77). Doubles: 1207, Comets: 15, Asteroids: 73
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pakarinen
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#23

Post by pakarinen »

Yes, it's the 13.8. I took it down to 10mm (VIxen SLV) briefly this morning on the moon although there was some high cloud. Not super sharp b/c of the clouds, but looks promising. Also showed me how dirty my diagonal is...
Olen Suomalainen!


Orion ST120, Meade AdventureScope ST80, Skywatcher 90mm Mak
Twilight 1 / Astro Devices encoders / Nexus II / Manfrotto 475B tripod
Nikon Aculon 10x50 binos
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pakarinen
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#24

Post by pakarinen »

Had a brief session this morning.

Albireo - looked good, sharp, nice colors
Ring - Just meh, but from home the Ring is usually not much better than "meh", so it's probably not a fair test.
Epsilon Lyr - this was the highlight. I was able to fleetingly resolve Eps 2 at 208X. Problem was that the FOV is so small at that magnification that Eps was flying through the FOV so I spent most of my time tracking it.

Maybe some moon time soon.
Olen Suomalainen!


Orion ST120, Meade AdventureScope ST80, Skywatcher 90mm Mak
Twilight 1 / Astro Devices encoders / Nexus II / Manfrotto 475B tripod
Nikon Aculon 10x50 binos
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Bigzmey
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#25

Post by Bigzmey »

Nice that you manage more observing Pakarinen. Yes, tracking at high powers can get tricky. What mount do you use?
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.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1694 (Completed: M110, H1, H2. In progress: H3: 195, H2,500: 1272, S110: 77). Doubles: 1207, Comets: 15, Asteroids: 73
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pakarinen
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#26

Post by pakarinen »

Twilight 1 (with slo-mo). I really like the specs of some of the other alt-az mounts, but I'm reluctant to give up slo-mo.

I've considered getting an M1V just to see how well I can do without slo-mo but I haven't felt like spending the money.
Olen Suomalainen!


Orion ST120, Meade AdventureScope ST80, Skywatcher 90mm Mak
Twilight 1 / Astro Devices encoders / Nexus II / Manfrotto 475B tripod
Nikon Aculon 10x50 binos
User avatar
Bigzmey
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Articles: 5
Posts: 1972
Joined: Sat May 11, 2019 7:55 pm
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#27

Post by Bigzmey »

pakarinen wrote:
Thu Mar 26, 2020 1:07 pm
Twilight 1 (with slo-mo). I really like the specs of some of the other alt-az mounts, but I'm reluctant to give up slo-mo.

I've considered getting an M1V just to see how well I can do without slo-mo but I haven't felt like spending the money.
Slow motion is critical for the scopes with narrow FOV. I tried a couple of AltAz manual mounts without slo-mo, and it becomes painful to truck at high powers.
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.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 1694 (Completed: M110, H1, H2. In progress: H3: 195, H2,500: 1272, S110: 77). Doubles: 1207, Comets: 15, Asteroids: 73
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