Barlow Vernonscope

[astrol]

Salut,

 

Est ce que qqun connait ce fabriquant?

Aux USA leur barlow 2,4x en 31.75 coute pratiquement le même prix qu'une Televue Powermate 2,5X en 31.75. Laquelle serait preferable pour du planétaire avec un C11.

Voici le détail de la barlow Vernonscope :

 

1 1/4" Parfocal Dakin Barlow

2.4X magnification eliminates duplication of power. When used with Brandon 1 1/4" oculars the 32mm changes to 14mm, 24mm to 10mm, 16mm to 7mm, 12mm to 5mm, 8mm to 3.5mm. 10 different powers from 5 oculars!

http://www.vernonscope.com/

 

Vernonscope 2.4x Dakin Barlow for 1.25" eyepieces

This Ralph Dakin doublet design is considered by many professional astronomers to be the Rolls-Royce of Barlows. It has a magnification of 2.4x for non-repeating eyepiece powers. A non-marring nylon thumbscrew holds eyepieces securely in place. The lenses are antireflection coated, but not multicoated. One reason not to multicoat is to eliminate or greatly reduce a phenomenon known as "narrow angle light scatter." Multicoatings have more narrow angle scatter than single layer coatings. You can see this effect on bright objects like Venus, Mars, or Jupiter, where scattered light can greatly interfere with low contrast detail. You can also notice a difference in the background darkness immediately surrounding a bright object, which is especially important for planetary or close binary star observing. In addition, lunar detail such as the bands of Aristarchus are usually better defined. The barrel has internal antireflection threading to further improve contrast. Its 4.25" length allows its use in many star diagonals. The Dakin Barlow performs best with scopes f/6 and above.

http://www.astronomics.com/main/product.asp/catalog_name/Astronomics/category_name/TLQKDRMVAR9T8L5VBFF7TUKRW0/product_id/770

 

Merci

Bon ciel à tous