What is your favourite AFOV?

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Lady Fraktor
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What is your favourite AFOV?

#1

Post by Lady Fraktor »

My eyepiece collection ranges from about 10° up to 84° but my favourites are in the 30° to 45° range followed by 50° to 60°.
I enjoy planetary, lunar and double stars mostly but do view pretty much any object within reach of my telescopes.
I do like viewing DSOs but I am not much for 'framing' a object with a over large FOV, and any eyepiece that I have to turn my head to find the field stop will probably become a paperweight quite quickly.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

#2

Post by notFritzArgelander »

My preferred AFOV is similar to yours, but more like 40-50 degree eyepieces.Then there are the 60-70 degree AFOVs which are second place. My observing is more tilted towards DSOs than planetary and double stars. I will go for framing a DSO since the wider AFOV can frame an object at smaller exit pupil than otherwise.

I value being able to use the eyepiece in the daytime and have straight lines be straight. :) So the field distortion in the 80 and 100 degree AFOV oculars is pretty annoying. For a long time I though that it was a crime against optics that I loathed the 80 degree formats so much. Bought a set of Naglers sold it and made the mistake of trying them again to sell them again. I also used to have 3 100 degree format oculars that were simply toys.

One thing I noticed in my samplings of the really wide fields that ALSO annoyed me was that it seemed that there were quality control issues with the coatings. One of the last t6 Naglers and all the 100 degree AFOVs had a variable sky background. It looked dirty. I examined closely and it seemed to me that there were slight variations in the coatings.

For the wide field framing, when I want to do that exercise, I'm happy with the 60-70s. The 80s and 100s are gone. They were too much "IT'S ALL ABOUT ME!". ;)
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: What is your favourite AFOV?

#3

Post by Ruud »

I have a preferred range from 72° to 76°. That's what my Delos and Morpheus eyepieces show. These are high image quality, low angular magnifications distortion eyepieces, but it is not just that.

For panning the Moon or the Milky Way with pleasure 60° or lower is less suited as I want to know I came from and where I'll turn to. The subjective disadvantage of 82° and up is that I cannot see the whole field at a glance which makes taking in the entire field feel like an effort.
7x50 Helios Apollo 8x42 Bresser Everest 73mm f/5.9 WO APO 4" f/5 TeleVue Genesis 6" f/10 Celestron 6SE 0.63x reducer 1.8, 2, 2.5 and 3x Barlows eyepieces from 4.5 to 34mm
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Re: What is your favourite AFOV?

#4

Post by Robko »

I like my 82's. Working with an dobson without any tracking it's nice to see the object for a while without nudging the telescope. No experience with 100,s but turning your head in order to see an object doesnt appeal to me.
scopes: Obsession 18" classic / Tak. Epsilon 160 / Tak. FS60c / Vixen FL55ss
mount; Gemini G41 field
camera: Nikon D810A
eyepieces: Nagler 5, 7, 13mm Vixen LVW 22
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Re: What is your favourite AFOV?

#5

Post by KathyNS »

I like eyepieces with a 68 or 70 degree AFOV. That is quite wide enough to get a good, broad view, without giving you a "marooned in a space suit" feel.
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DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope; Planetary AP: Celestron C-11; ZWO ASI120MC; Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos; Etc: Canon 350D; Various EPs, etc. Obs: 8' Exploradome; iOptron CEM60 (pier); Hall's Harbour Observatory (H2O) Astrobin
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Re: What is your favourite AFOV?

#6

Post by Bigzmey »

For DSOs I have tried 40 to 82 and gravitated to ~70 at the end. For planets, Moon and doubles I prefer 50 to 60. Bellow 50 feels too narrow for me.
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" 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: Binoviewers, Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & 2xXFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: 2xBCOs, Aspherics, Mark IV, Meade: Plossls.
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, 6-color set; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2246 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1770, S110: 77). Doubles: 1448, Comets: 18, Asteroids: 97
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Lady Fraktor
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Re: What is your favourite AFOV?

#7

Post by Lady Fraktor »

Bigzmey wrote: Mon May 24, 2021 4:25 pm For DSOs I have tried 40 to 82 and gravitated to ~70 at the end. For planets, Moon and doubles I prefer 50 to 60. Bellow 50 feels too narrow for me.
You should try a ball lens, on axis about 5-15° AFOV on axis, everything outside that is blurred but you will have the cleanest most contrasty view in center. Quite amazing views.
ER is usually 5mm and less though.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Lady Fraktor
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Re: What is your favourite AFOV?

#8

Post by Lady Fraktor »

KathyNS wrote: Mon May 24, 2021 11:49 am I like eyepieces with a 68 or 70 degree AFOV. That is quite wide enough to get a good, broad view, without giving you a "marooned in a space suit" feel.
I had a set of Nikon NAV-HW (102°) on loan for a while, the views were spectacular but I just did not enjoy that I had to keep turning my head to see the entire FOV.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

#9

Post by notFritzArgelander »

Lady Fraktor wrote: Mon May 24, 2021 4:32 pm
Bigzmey wrote: Mon May 24, 2021 4:25 pm For DSOs I have tried 40 to 82 and gravitated to ~70 at the end. For planets, Moon and doubles I prefer 50 to 60. Bellow 50 feels too narrow for me.
You should try a ball lens, on axis about 5-15° AFOV on axis, everything outside that is blurred but you will have the cleanest most contrasty view in center. Quite amazing views.
ER is usually 5mm and less though.
Do you means the Herschel eyepiece? Not the monocentric.....
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: What is your favourite AFOV?

#10

Post by Bigzmey »

Lady Fraktor wrote: Mon May 24, 2021 4:32 pm
Bigzmey wrote: Mon May 24, 2021 4:25 pm For DSOs I have tried 40 to 82 and gravitated to ~70 at the end. For planets, Moon and doubles I prefer 50 to 60. Bellow 50 feels too narrow for me.
You should try a ball lens, on axis about 5-15° AFOV on axis, everything outside that is blurred but you will have the cleanest most contrasty view in center. Quite amazing views.
ER is usually 5mm and less though.
No, thank you. :) For me blurry edges are worse than narrow field. :lol:
Scopes: Stellarvue: SV102 ED F7; Celestron: 9.25" EdgeHD F10, 8" 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: Binoviewers, Little Giant II 15x70, WorldView 10x50, Nikon: Action EX 16x50 & 8x40.
EPs: Pentax: XWs & 2xXFs; TeleVue: Delites, Panoptic & Plossls; ES: 68, 62; Vixen: SLVs; Baader: 2xBCOs, Aspherics, Mark IV, Meade: Plossls.
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, 6-color set; Astronomik: UHC, Orion: UltraBlock, SkyGlow.
Observing: DSOs: 2246 (Completed: Messier, Herschel 1, 2, 3. In progress: H2,500: 1770, S110: 77). Doubles: 1448, Comets: 18, Asteroids: 97
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Re: What is your favourite AFOV?

#11

Post by Lady Fraktor »

I have 1 Herschel style but a few others that are ball lenses.
There are a few places still to buy them I think and there are many places to buy the components to make them yourself.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

#12

Post by Lady Fraktor »

Bigzmey wrote: Mon May 24, 2021 4:45 pm No, thank you. :) For me blurry edges are worse than narrow field. :lol:
These would be perfect as you can have both! :lol:
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

#13

Post by notFritzArgelander »

Lady Fraktor wrote: Mon May 24, 2021 4:52 pm I have 1 Herschel style but a few others that are ball lenses.
There are a few places still to buy them I think and there are many places to buy the components to make them yourself.
I'm curious, now....
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: What is your favourite AFOV?

#14

Post by Lady Fraktor »

I just checked and Sieberts still sells his Planeshere eyepieces and Edmunds still sells components to make them yourself.
https://www.siebertoptics.com/Planesphere.html
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

#15

Post by notFritzArgelander »

Lady Fraktor wrote: Mon May 24, 2021 5:18 pm I just checked and Sieberts still sells his Planeshere eyepieces and Edmunds still sells components to make them yourself.
https://www.siebertoptics.com/Planesphere.html
I found the lenses on the Edmund Optics site. https://www.edmundoptics.com/f/used-ili ... ses/14111/

The material is fused silica so better transmission in the UV, likely an advantage on DSOs.

Still.... looks pretty Herschellian to me. ;)
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: What is your favourite AFOV?

#16

Post by Lady Fraktor »

Fused Silica and BK7 are the most common though Steve Coutre and Sieberts made sapphire and ruby ones for a while.
I suppose it is just interpretation, a Herschellian to me is a ball with a flat not completely spherical.
Telescopes: 1 more than I need but 2 less than I want
Mounts: 5 Equatorial, 3 Az/ Alt
Diagonal: 3 mirror, 2 Amici, 1 Herschel
Eyepieces: Possibly more than 1 person requires
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Re: What is your favourite AFOV?

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Post by notFritzArgelander »

Lady Fraktor wrote: Mon May 24, 2021 6:40 pm Fused Silica and BK7 are the most common though Steve Coutre and Sieberts made sapphire and ruby ones for a while.
I suppose it is just interpretation, a Herschellian to me is a ball with a flat not completely spherical.
Yes on interpretation. For me Herschellian is a sphere with a spherical cap removed, the thickness of the cap can vary from zero to the radius of the sphere.
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: What is your favourite AFOV?

#18

Post by 25585 »

Mine is 76° & less, apart from ES92s which are exceptionally usable for UWA. Most important though is effective eye relief, as I need to wear glasses.
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Eyepieces from: Aero, Antares, APM, Baader, Brandon, Bresser, Celestron, Datysun, Docter, Explore Scientific, GSO, I R Poyser, Meade, Nikon, Orion, Pentax, Rodenstock, Siberia, Sky-Watcher, Taiso, Takahashi, TAL, Tele Vue, TS, Vernonscope, Vixen, Zeiss.

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Re: What is your favourite AFOV?

#19

Post by Don Pensack »

As wide as physically possible.
Below a 9mm focal length I can observe without glasses, so 100-110°.
Above 9mm, I'm limited to 76-85° because of the use of glasses unless I want to use eyepieces well over a kilogram apiece like the ES 92s.
It's OK, though. I don't fee deprived to use eyepieces that narrow, though I do miss my 100° eyepieces in 10-21mm focal lengths.
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Re: What is your favourite AFOV?

#20

Post by j.gardavsky »

The md-optics in Berlin Wandlitz has as a rule an assortment of the optical glass spheres (BK7) with the quality certified by a manufacturer.
Now, someone has purchased nearly everything, just this 2.4mm size left, 99 pieces available,

https://www.ebay.de/itm/265072397869?ha ... Sw1ZBUrpsa

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JG
6" F/5 Sky-Watcher achro, 2" BBHS Star Diagonal, 2" zenith prism, 1.25" Takahashi prism
Leica 82mm APO Televid
Eyepieces: Docter UWA; Leica B WW and WW Asph. Zoom; Leica HC Plan S and L; Pentax SMC XW, O-, XO; Tak MC O, Carl Zeiss B WW, and Pl, E-Pl, S-Pl, W-Pl;
Swarovski SW; Baader Symmetric Diascope Edition; KK Fujiyama orthos: TMB supermonocentric; Rodenstock; Tele Vue;
Barlows: Baader VIP, Nikon EiC-16
Filters: Astrodon, Astronomik, Baader, Balzers, Zeiss West and East, Lumicon
Binoculars (7x42 up to 15x85): Docter Nobilem, Leica Ultravid, Nikon Astroluxe, Swarovski EL Swarovision; BA8 (Kunming Optical)
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