Vixen Bt126ss-a User manual

Instruction Manual for BT126SS-A Binocular Telescope

WARNING!

SPECIFICATIONS

COMPONENTS

BT126SS-A Shown with the Fork Mount,

Tripod and other Optional Accessories available separately

Never look directly at the sun with your naked eyes or through this product or its ﬁnder scope available.

Permanent and irreversible eye damage may result.

Thank you for your purchase of a Vixen BT126SS-A Binocular Telescope. This manual applies to the BT126SS-A Binocular Telescope.

Be sure to read instructions for the mount and tripod along with this manual if you purchased the product as a complete package

*For observing, two 31.7mm (1.25-inch) eyepieces of the same focal length are required as they are not included.

*A pair of the eyepieces are included if you purchase a complete package consisting of the BT126SS-A, HF2 Altazimuth Fork Mount ans SXG-HAL130 tripod.

Do not leave the product uncapped in daytime. It may cause passing sunlight through

the objective lens of the optical tube, resulting in ﬁre

Do not use the product while transporting or walking, as injuries may arise from

stumbling, falling or collision with objects.

Keep plastic and vinyl packing materials away from children; these may cause danger

from swallowing or suffocation.

The speciﬁcations are subject to change without notice.

About eyepieces applicable to BT126SS-A

The removable eyepieces can be swapped for other Vixen SLV or LVW or SSW series of 31.7mm-size eyepieces, but if the

eyepieces with high magniﬁcation are used, it may give rise to misalignment that becomes detectable due to its high magniﬁcation.

It is always recommendable to use the eyepieces with focal length longer than 10mm for observing to avoid it.

Do not leave the product inside a car in bright sunshine, or in hot places. Keep any

strong heat radiation sources away from the product.

Do not exposure the product to rain, water drops, dirt or sand.

When cleaning, do not use solvent such as paint thinners.

Avoid touching any lens surfaces directly with ﬁngers. If a lens becomes dirty with

ﬁngerprints or general smears, gently wipe it using a commercially available lens leaner

and a lens cleaning paper, or consult your local Vixen dealer.

For storage, keep the product in dry places, and do not expose to direct sunlight.

CAUTION HANDLING • STORAGE

Objective lens Air-spaced doublet achromatic

Optical coating Multi coating

Effective aperture 126 mm

Focal length (Focal ratio) 625mm (F5)

Resolving power 0.92 arc seconds

Limiting magnitude 12.3

Light gathering power 324x

Eyepiece holders Push ﬁt type

Eyepieces applicable

(Optional)

SLV series of 31.7mm size or LVW series of

31.7mm size or SSW series of 31.7mm size

Interpupillary distance 58mm to 102mm

Optional Finder scopes 7x50mm ﬁnder scope & bracket or X-Y red

dot ﬁnder

Mount block / Threads Dovetail bar

Threaded sockets 1/4-inch x 2 & 3/8-inch x 1

Size & weight 630mm L x 360mm W x 200mm H,

10.5kg (23.1 lbs)

Carry Handle

Objective Cap

BT126SS-A

Threaded sockets

for camera tripods

7x50 Finder Scope

(Optional)

XY Finder bracket

(Optional)

Eyepieces

(Optional)

HF2 Fork mount

(Optional)

SXG-HAL130 Tripod (Optional)

Eyepiece Holders (Pish ﬁt)

Focus Ring

Prism Housing

45-degree Angled

Lock screw

Trunnion

Finder-bracket Shoe

Tripod Sockets (Bottom)

Optical Tube

Dew Shield

Objective Lens

(inside)

1 2

3 4

USING YOUR BT126SS-A BINOCULAR TELESCOPE

ALIGNMENT

The BT126SS-A has threaded sockets of 1/4”-20 and a 3/8” on the

bottom of the dovetail bar that ﬁt directly to a camera tripod. 2

Attach the eyepieces so that the chrome barrel of the eyepiece is push

into the eyepiece holder entirely. When you exchange the eyepieces,

you should align the optical axis of left side and right side eyepieces in

the procedure stated in ALIGNMENT.

While looking through the right side eyepiece, turn the focus ring on the

right side prism housing until the image appears in sharp focus. Next,

look through the left side eyepiece and adjust the focus of the left side

eyepiece in the same way by turning the left side focus ring.

Look through the left side eyepiece and ﬁnd an object further than

1,000m distant. Put the object in the ﬁeld of view so that it lies on the

imaginary horizontal center line of the ﬁeld of view, and shift it to the very

right edge. An electric pole is shown here as a sample.

The object near the edge of the ﬁeld of view makes your recognition of a

position of the object against the ﬁeld of view circle easier.

If the object is seen at the same level and position on the right side

eyepiece as seen with the left side eyepiece, it shows that the eyepieces

are aligned correctly.

If not, rotate the right side eyepiece slowly clockwise or

counterclockwise until the object moves toward the same position.

2If the above does not align the optics correctly, then rotate the left side

eyepiece slowly while keeping the right side eyepiece as it is.

It may be possible that a double vision occurs from the character of binoculars when you attach the eyepieces without a consideration for

optical alignment. In this case, make adjustments of the optical axis in the following procedure.

The object can be seen more clear and brighter at low magniﬁcation. It is desirable to start with a pair of eyepieces with low magniﬁcation and exchange

them for eyepieces with medium magniﬁcation. It will be hard to align the optical axis at high magniﬁcation due to the structure of binocular telescopes.