zoom SVbony 8-20mm

[BobSaintClar 5318]

Astrams lointains, bonjour

 

Un ami japonais du club de Toda a récemment partagé son essai du dernier zoom 8-20mm de chez SVbony. Il l'a comparé avec son "équivalent" Hyperion, de marque Baader.

Je crois comprendre qu'il est relativement récent et novateur (de part son champs apparent assez flatteur, et son prix élevé pour une marque plus habituée à l'entrée de gamme).

Je me suis dit que cela pourrait intéresser les lecteurs de ce forum.

Voici le rapport de l'astronome nippon, avec son autorisation, traduit en Anglais (parce que croyez-moi, vous ne voulez pas lire la version française...) :

 

(note : j'ignore pourquoi le texte est sombre. J'ai tenté de le copier/coller en utilisant deux méthodes différentes, sans succès)

 

As the weather is getting cooler, I compared the latest zoom eyepieces from SBVONY in my spare time (This is just my personal impression, I hope it will be of some help...)

 

I compared the SV230 zoom eyepiece with the Hyperion Zoom IV in the daytime ground view (utility pole barbs and supports).

I will bring it to the expedition, so please check it with your own optical tube at that time.

 

Weight and Price

SV230・・・・450g (500g with 2 inch sleeve, very heavy) 42.500 yen (including tax, free shipping)

Hyperion IV: 280g, 48.180 yen (tax included, free shipping)

 

Maximum diameter

SV230・・・・55㎜（Binoculars available)

Hyperion IV: 55mm (for binoculars)

 

Click Zoom Operation Power

SV230 8㎜・9・10・11・12・13・14・15・16・17・18・19・20 (red is slick position)... Zoom rotation is heavy.

Hyperion IV 8mm, 12, 16, 20, 24... Zoom rotation is very light.

 

Apparent field of view

SV230・・・・8㎜(72 degree)-20㎜(57 degree)... The field of view feels wide!

Hyperion IV: 8㎜(68 degree)-20㎜(53 degree)-24㎜(48 degree). I feel the field of vision is narrow at 24㎜ position.

 

 

Eye Relief / Both of them allow you to see the entire field of view even if you wear glasses if you press your glasses against the lens.

SV230・・・・8㎜(19㎜)-20㎜(17㎜)... Blackout occurs when the eye lens is off-center.

Hyperion IV: 8㎜(16㎜)-24㎜(19㎜)

 

*Displacement of focus during zoom operation (when changing from long focus to single focus)

SV230_・・・・ focus deviation is not “zero” but “much less” than Hyperion over entire range; noticeable deviation when zooming to 14㎜ position.

Hyperion IV: More noticeable than SV230 in terms of out-of-focus, slightly larger noticeable out-of-focus at 20㎜ and 8㎜.

 

Image distortion at the edge of the field of view

SV230・・・・ “Aspherical lens” is incorporated to provide flat and good image up to 95% of field of view in entire zoom range. The image shift at the edge of the field of view is also not bothersome (I did not look at the stars, so I have not confirmed the collapsed star image).

Hyperion IV: No aspherical lens is used, but the image remains flat up to about 90% of the field of view over the entire zoom range. The image at the edge of the field of view collapses to a greater degree than that of SV230.

 

Sharpness, contrast, and sharpness (highest is 10)

SV230・・・・ Brightness (10), Sharpness (10), Contrast (10), and Nuance (10)

Hyperion IV: Brightness (8), Sharpness (9), Contrast (8), Nuance (8)

 

Others

SV230_・・・・ eyecups are rubber folded and come with a stainless steel 2” sleeve.

Hyperion IV - Eyecups are made of rubber and can be rotated to adjust height.

 

★★★General Comments (daytime visibility)

SV230・・・・The image is very bright, sharp (flat), and high-contrast due to the latest design. However, its weight and heavy zoom rotation force are negative points.

Hyperion IV: Although the design is old and visibility is not as good as it used to be, this zoom eyepiece is lightweight, has a wide zoom ratio, and is easy to use (this one eyepiece is usually all you need). SV215 Zoom (3-8㎜) is recommended for super high-power zoom.

[PETIT OURS 25398]

As the weather is getting cooler, I compared the latest zoom eyepieces from SBVONY in my spare time (This is just my personal impression, I hope it will be of some help...)

 

I compared the SV230 zoom eyepiece with the Hyperion Zoom IV in the daytime ground view (utility pole barbs and supports).

I will bring it to the expedition, so please check it with your own optical tube at that time.

 

Weight and Price

SV230・・・・450g (500g with 2 inch sleeve, very heavy) 42.500 yen (including tax, free shipping)

Hyperion IV: 280g, 48.180 yen (tax included, free shipping)

 

Maximum diameter

SV230・・・・55㎜（Binoculars available)

Hyperion IV: 55mm (for binoculars)

 

Click Zoom Operation Power

SV230 8㎜・9・10・11・12・13・14・15・16・17・18・19・20 (red is slick position)... Zoom rotation is heavy.

Hyperion IV 8mm, 12, 16, 20, 24... Zoom rotation is very light.

 

Apparent field of view

SV230・・・・8㎜(72 degree)-20㎜(57 degree)... The field of view feels wide!

Hyperion IV: 8㎜(68 degree)-20㎜(53 degree)-24㎜(48 degree). I feel the field of vision is narrow at 24㎜ position.

 

 

Eye Relief / Both of them allow you to see the entire field of view even if you wear glasses if you press your glasses against the lens.

SV230・・・・8㎜(19㎜)-20㎜(17㎜)... Blackout occurs when the eye lens is off-center.

Hyperion IV: 8㎜(16㎜)-24㎜(19㎜)

 

*Displacement of focus during zoom operation (when changing from long focus to single focus)

SV230_・・・・ focus deviation is not “zero” but “much less” than Hyperion over entire range; noticeable deviation when zooming to 14㎜ position.

Hyperion IV: More noticeable than SV230 in terms of out-of-focus, slightly larger noticeable out-of-focus at 20㎜ and 8㎜.

 

Image distortion at the edge of the field of view

SV230・・・・ “Aspherical lens” is incorporated to provide flat and good image up to 95% of field of view in entire zoom range. The image shift at the edge of the field of view is also not bothersome (I did not look at the stars, so I have not confirmed the collapsed star image).

Hyperion IV: No aspherical lens is used, but the image remains flat up to about 90% of the field of view over the entire zoom range. The image at the edge of the field of view collapses to a greater degree than that of SV230.

 

Sharpness, contrast, and sharpness (highest is 10)

SV230・・・・ Brightness (10), Sharpness (10), Contrast (10), and Nuance (10)

Hyperion IV: Brightness (8), Sharpness (9), Contrast (8), Nuance (8)

 

Others

SV230_・・・・ eyecups are rubber folded and come with a stainless steel 2” sleeve.

Hyperion IV - Eyecups are made of rubber and can be rotated to adjust height.

 

★★★General Comments (daytime visibility)

SV230・・・・The image is very bright, sharp (flat), and high-contrast due to the latest design. However, its weight and heavy zoom rotation force are negative points.

Hyperion IV: Although the design is old and visibility is not as good as it used to be, this zoom eyepiece is lightweight, has a wide zoom ratio, and is easy to use (this one eyepiece is usually all you need). SV215 Zoom (3-8㎜) is recommended for super high-power zoom.

 

[astrocg 428]

price please?

[jctfrance 245]

le prix:   https://fr.aliexpress.com/item/1005007338661244.html?spm=a2g0o.productlist.main.17.5a334d46F6qJ1E&algo_pvid=0c4212bc-5883-40fa-80e7-e6a114a599a3&algo_exp_id=0c4212bc-5883-40fa-80e7-e6a114a599a3-8&pdp_npi=4%40dis!EUR!628.51!383.39!!!685.40!418.09!%40211b650b17276038025956375efa61!12000041483365555!sea!FR!100272247!X&curPageLogUid=GZO1JaM6vuHP&utparam-url=scene%3Asearch|query_from%3A

mais comme ça dépasse 150€, il y aura des frais de douanes

sur le site SVBONY, il est à 305,56€ + 22,22€ pour l'expédition avec TOUTES les taxes

Edited September 29 by jctfrance

[pachytriton54 16]

322€ sur le site Svbony avec frais de port et TVA

[grelots 1636]

Ha oui quand même

[jctfrance 245]

il y a 34 minutes, pachytriton54 a dit :

322€ sur le site Svbony avec frais de port et TVA

je l'avais mentionné juste au dessus 

[BobSaintClar 5318]

Le 30/09/2024 à 17:59, grelots a dit :

Ha oui quand même

Si l'oculaire est bon, compte tenu de la plage focale couverte, ce n'est pas forcément une mauvaise affaire. Mais pour cette marque, le Japon n'est pas spécialement bien placé. Mieux vaut acheter local (comme pour les fruits et légumes). Pour te donner un exemple, en ce moment dans les PA nippones, il y a une TOA 150B - optiquement nickel - pour 6200 euros ! Ce n'est pas ma came mais j'imagine que cela en ferait rêver plus d'un 

[jctfrance 245]

Il y a 5 heures, BobSaintClar a dit :

6200 euros

Oui, c'est beau, mais pour un envoi vers la France, mëme pour une occasion, il faut compter les taxes  comme sur du neuf sur le prix d'achat et les frais de transport 

Edited Tuesday at 04:03 PM by jctfrance

[jctfrance 245]

Il y a 5 heures, BobSaintClar a dit :

Mieux vaut acheter local (

je n'ai pas compris le raisonnement, avec le Japon notamment.

[BobSaintClar 5318]

Il y a 3 heures, jctfrance a dit :

je n'ai pas compris le raisonnement, avec le Japon notamment

Les produits japonais sont moins chers au Japon qu'en Europe, tout simplement. Les seules exceptions se produisent sur le marché de l'occasion : sur certains articles, les locaux se conduisent en collectionneurs - typiquement sur du matos japonais vintage, souvent des trucs complètement improbables, genre lunettes Carton de 60mm à FD 20 - et là, les prix flambent.

[jctfrance 245]

Il y a 10 heures, BobSaintClar a dit :

Les produits japonais sont moins chers au Japon

Oui, j'avais d'ailleurs commandé 2 Nikon NAV au Japon et ils étaient bien moins chers qu'en Europe; d'ailleurs, le prix d'un HW est super intéressant en commandant directement; seul hic, ils sont très réticents à envoyer certains produits notamment Taka.

NB: SVbony est chinois.