90mm Mak

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pakarinen United States of America
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Re: 90mm Mak

#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.
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I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Bigzmey United States of America
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Re: 90mm Mak

#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: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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pakarinen United States of America
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Re: 90mm Mak

#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...
=============================================================================
I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Re: 90mm Mak

#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.
=============================================================================
I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Bigzmey United States of America
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Re: 90mm Mak

#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: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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pakarinen United States of America
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Re: 90mm Mak

#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.
=============================================================================
I drink tea, I read books, I look at stars when I'm not cursing clouds. It's what I do.
=============================================================================
AT50, AT72EDII, ST80, ST102; Scopetech Zero, AZ-GTi, AZ Pronto; Innorel RT90C, Oberwerk 5000; Orion Giantview 15x70s, Vortex 8x42s, Navy surplus 7x50s, Nikon 10x50s
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Bigzmey United States of America
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Re: 90mm Mak

#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: SV102ED; Celestron: 9.25" EdgeHD, 8" SCT, 150ST, Onyx 80ED; iOptron: Hankmeister 6" Mak; SW: 7" Mak; Meade: 80ST.
Mounts: SW: SkyTee2, AzGTi; iOptron: AZMP; ES: Twilight I; Bresser: EXOS2; UA: MicroStar.
Binos: APM: 100-90 APO; Canon: IS 15x50; Orion: Binoviewer, LG II 15x70, WV 10x50, Nikon: AE 16x50, 10x50, 8x40.
EPs: Pentax: XWs & XFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: BCOs, Aspherics, Mark IV.
Diagonals: Baader: BBHS mirror, Zeiss Spec T2 prism, Clicklock dielectric; TeleVue: Evebrite dielectric; AltairAstro: 2" prism.
Filters: Lumicon: DeepSky, UHC, OIII, H-beta; Baader: Moon & SkyGlow, Contrast Booster, UHC-S, 6-color set; Astronomik: UHC.

Observing: DSOs: 3106 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 2180, S110: 77). Doubles: 2382, Comets: 34, Asteroids: 255
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