A 150 mm Achromat and a 120 mm Apo, a personal review.

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John Baars
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A 150 mm Achromat and a 120 mm Apo, a personal review.

#1

Post by John Baars »

A 150 mm Achromat and a 120 mm Apo, a personal review.
by John Baars

Performance of and differences between a 150mm widefield achromat and a 120mm apochromat. A personal review. Apple and pears are both fruit. Comparisons between the two are normally not done. Different taste, shape and bite. Still, we do it all the time. Consumers know the differences. Why bother for...
Read more...
Telescopes in Schiedam : SW 150mm Achromat F/5, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 Maksutov F/14.3, SW 102 Maksutov F/13 on Vixen GPDX.
Eyepieces: Kitakaru, Eudiascopic, Jena, Panoptic, Nagler, Morpheus, Leica ASPH zoom, Brandon, Parks, Fujiyama, Pentax XO5 and XO2.5 .
Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.

Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.

Amateur since 1970.
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#2

Post by Don Quixote »

For some reason when I pull up the review the screen has a black background and it's difficult to read the text... any ideas?
Thank you, John.
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John Baars
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#3

Post by John Baars »

Same here. When I submit the black version of TSS, it becomes readable. I'll ask.

[Edit: can't be helped at this time, sorry. It will become beter readable when you turn to the black version of TSS]
Telescopes in Schiedam : SW 150mm Achromat F/5, SW Evostar 120ED F/7.5, Vixen 102ED F/9, OMC140 Maksutov F/14.3, SW 102 Maksutov F/13 on Vixen GPDX.
Eyepieces: Kitakaru, Eudiascopic, Jena, Panoptic, Nagler, Morpheus, Leica ASPH zoom, Brandon, Parks, Fujiyama, Pentax XO5 and XO2.5 .
Binoculars: AusJena 10X50 Jenoptem, Swarovski Habicht 7X42, Celestron Skymaster 15X70, Swift Observation 20X80.

Astronomical Rijswijk observatory telescopes: Astro-Physics Starfire 130 f/8 on NEQ6, 6 inch Newton on GP, C8 on NEQ6, Meade 14 inch SCT on EQ8, Lunt.

Amateur since 1970.
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#4

Post by Thefatkitty »

Well, black background or not, I squinted through it :D Very nice, John! It was quite an interesting read; definitely some points to ponder.

Thanks again and all the best,
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#5

Post by Unitron48 »

No problem reading, John. Nice comparison....thanks for doing and sharing!!

Dave
Unitron Refractors (60mm, 75mm, 102mm, 125mm), Brandon 94, Zeiss T-1, Stellarvue SV110ED
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#6

Post by j.gardavsky »

Excellent comparison, based on a long time experience with the telescopes!!!

Thank you John for sharing,
JG
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#7

Post by notFritzArgelander »

Very interesting read. Thanks!
Scopes: Refs: Orion ST80, SV 80EDA f7, TS 102ED f11 Newts: 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 III, Vixen Porta II, Celestron CG5, Orion Sirius EQG
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#8

Post by Lady Fraktor »

A very good article John, thank you for taking the time to do this.
🇸🇰
Proper Telescopes: Antares 105 f/15, Bresser 102 f/13.2, Celestron 150 f/8, Stellarvue NHNGDX 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen ED115s f/7.7
Mounts: Berlebach Planet w/ pier, Celestron AS-GT, Celestron CG-5 w/ Argo Navis & tracking motor, SLT w/ pier & tripod mods, Manfrotto 028b w/ SV M2C, Mantrotto 055Pro w/ 128RC, TAL MT1C, Vixen SXP w/ HAL-130 & half pier
Diagonal: 2" A-P Maxbright, 2" Baader Herschel Wedge (P), 2" Zeiss/ Baader Amici Prism (DX2), 2" Orion Amici Prism, 2" Stellarvue DX, 2" TeleVue EverBrite
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#9

Post by Don Quixote »

Got it John.
Thank you for this great review!
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#10

Post by Juno16 »

Very interesting article John!

Great data presentation!

Like Jg said, you know these scopes intimately.

Thanks, and very nice article!
Scopes: Explore Scientific ED102 Triplet APO, Celestron Nexstar 130 SLT.
Mounts: Celestron AVX with Orion MM Autoguider, SLT;
Binoculars: Bushnell 10X50
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#11

Post by Makuser »

Hello John. A superlative comparison and analysis report. I knew going in that the chromatic aberration would be an issue. To my knowledge, there are 6 of us on this forum here using a 6" class achromatic refractor. You and JG use the SkyWatcher branded 150 f/5. Bigzmey (Andrey) and I use the Celestron branded 150 f/5. Don Quixote (Mark) and Helicon (Michael) use the Explore Scientific 152 f/6.5. They work great on the moon, until you get near the limb, and then the chromatic aberration sets in, and the planets look like a kaleidoscope. But wait, we use these for the beautiful wide field, high contrast, and sharp views on the DSO's (faint fuzzies). Most of us have another more suitable telescope that we can use for planetary work. Thanks for your great comprehensive report John, and the very best of regards.
- Marshall
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Celestron SkyMaster 15x70 Binoculars. ZWO ASI120MC camera.
>)))))*>
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#12

Post by DeanD »

Thanks John: great comparison: well done!!! As you say, it is pretty much as expected, especially with planetary and lunar views in the apo: but it is great to have a more in-depth analysis.

Marshall, I also have the Celestron 150 f5 achro. ;) Great for widefield and faint fuzzy views on a budget. I would love to have an Esprit 150 or the Evostar 150, but I couldn't justify it without selling my TSA102: and that isn't going to happen; so my achro has to satisfy my lust for size- and it does it surprisingly well.

Keep up the good work John, and happy viewing.

- Dean
Telescopes: 12" f5 dob, Celestron CPC800, 150mmf5 Celestron achro, Tak TSA102, TV76, ETX125...
Binos: Tak 22x60, Swarovski 8x30 Habicht, FB 25x100, Orion Regulux 15x70...
Eyepieces: way too many (is that possible?), but I do like my TV 32mm plossl, 13mm Nagler T6, 27mm Panoptic and 3-6mm Nagler zoom, plus Fujiyama 18mm and 25mm orthos and Tak 7.5mm LE
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#13

Post by Greenman »

Useful review, too often there is a default to the most technical solution. However, there are always compromises in every solution. As shown here.
Cheers,

GM

First Scope: Celestron 130EQ MD

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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#14

Post by pakarinen »

Nice review, thanks. I selected the text with my mouse so the black background shows as white text on royal blue.
The lamp once out
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The window frame.

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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

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Post by Makuser »

DeanD wrote:
Mon Apr 27, 2020 11:35 am
Marshall, I also have the Celestron 150 f5 achro. ;) Great for widefield and faint fuzzy views on a budget. I would love to have an Esprit 150 or the Evostar 150, but I couldn't justify it without selling my TSA102: and that isn't going to happen; so my achro has to satisfy my lust for size- and it does it surprisingly well.
- Dean
Hi Dean. I am sorry that I missed you in the group. Well, that makes 7 of us now. :lol: I really enjoy my XLT150R refractor, as it is easy to carry out, setup, and a joy to use. This Fraunhofer doublet refractor does a great job on the faint fuzzies for the cost. A scope this size in a ED or APO version is way out of my price range, especially since I am retired now. Thanks for reminding me Dean, and the very best of regards.
- Marshall
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Celestron SkyMaster 15x70 Binoculars. ZWO ASI120MC camera.
>)))))*>
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#16

Post by Bigzmey »

We should open 150ST club! :)

Excellent review John! Matches my experience to the letter. 150ST is my favorite scope for open clusters, large nebulae and low power walks along the Milky Way. It is also riches surprisingly deep on faint galaxies, even though I now have bigger guns for that.

Smaller APO/ED scopes my favorite tools for doubles and casual planet/Moon observing.

When I want to go deep for faint galaxies or high resolution on planets/Moon, I roll my large SCT out.
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: 1805 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1377, S110: 77). Doubles: 1304, Comets: 15, Asteroids: 75
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#17

Post by helicon »

Thanks for the review John. 6" Achros despite some of the weaknesses, are excellent scopes for general observing. My 6" frac is out almost every clear night.
-Michael
Various scopes, 10" Zhumell Dob, ES AR152, AWB 5.1" Onesky newt, Oberwerk 25x100 binos, two eyeballs
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#18

Post by Doug James »

It is definitely a very interesting read . Thanks for posting it.
Celestron Omni XLT 120 Refractor, Orion XT8 Classic Dobsonian - Telrad finder - Sirius Plossl 1.25" eyepieces 40mm,25mm,17mm,
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#19

Post by Makuser »

helicon wrote:
Mon May 18, 2020 2:50 pm
Thanks for the review John. 6" Achros despite some of the weaknesses, are excellent scopes for general observing. My 6" frac is out almost every clear night.
Well, now I count 8 of us using this variety of telescope.
- Marshall
Orion Astroview 120ST f/5 Refractor on EQ3 mount
Celestron Omni XLT150R f/5 Refractor on CG4 mount with dual axis drives.
Orion 180mm f/15 Maksutov-Cassegrain on CG5-GT Goto mount.
Orion XT12i 12" f/4.9 Dobsonian Intelliscope.
Celestron SkyMaster 15x70 Binoculars. ZWO ASI120MC camera.
>)))))*>
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Re: A 150 mm Achromat and a 120 mm Apo, a personal review.

#20

Post by Bigzmey »

Makuser wrote:
Tue May 19, 2020 7:10 pm
helicon wrote:
Mon May 18, 2020 2:50 pm
Thanks for the review John. 6" Achros despite some of the weaknesses, are excellent scopes for general observing. My 6" frac is out almost every clear night.
Well, now I count 8 of us using this variety of telescope.
Everyone should have it. :D A great performer in amazingly compact and lightweight package.
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: 1805 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1377, S110: 77). Doubles: 1304, Comets: 15, Asteroids: 75
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