The 2″ Extension Tube 80mm length is the longest of the available extension tube in 2″. Most adapters or eyepieces fit into it snugly. In some cases the barrel of the eyepiece or adaptor may be a little bit too long so that it extends a little bit beyond the extension tube. This does not cause any problems or any loss in mechanical stability.

The “optical length” includes only the length of the extension tube that acually extends out of the focuser. The length of the 2″ barrel of the extension tube is not included in this figure since the barrel normally disappears entirely into the focuser.

Eyepiece Clamp:

The eyepiece is clamped firmly but without scratches through a brass compression ring. The advantage is that eyepieces are held more securely and the risk of the eyepiece being tilted out of the optical axis is minimized.

Quality of Make:

These 2″ Extension Tube – 80mm are machined from solid aluminium. They are black anodized. The 2″ barrel has a safety undercut to prevent the extension tube from dropping out of the focuser accidentally. Of course the barrel also has a 2″ filter thread (M48x0.75) on the telescope side.

Extension Tubes from TS

Different telescopes can have very different back focus distances. In most telescopes the focal plane is deliberately moved further out, allowing users to attach cameras and other accessories more easily.

Refractors always have a rather long back focus since they are usually used with a star diagonal or erecting prism.

The Problem:

As a result of this you often cannot directly focus the telescope if you do not use it with the above accessory. You would have to move the focuser further out, but you reach the end of the focus travel before reaching a focused image.

The Solution:

TS extension tubes bridge the gap between the focuser and the focal plane. They are the ideal solution whenever focus lies further outside than you can normally reach with the focuser.

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TheTS 70mm f6.78 Quad is part of the Imaging Star Line and an ideal travel telescope for all photographers.

The Apo is very well corrected for imaging and also offers good visual performance.

Magnifications up to 150x are handled very well by the ED lens, chromatic aberration is significantly reduced. This TS 70mm f6.78 Quad is recommended for all nature observers, photographers and amateur astronomers who are looking for a compact telescope that does everything well.

The length of only 30cm (with retracted dew cap) makes the Apo very easy to transport in its case.

Advantages of the TS Imaging Star 70mm ED quadruplet:

– very good field correction with the built in 2 element corrector
– camera sensors up to 32mm diagonal are covered
– 2 “dual speed Crayford allows photography and observation
– 360 ° rotation of the drawer for the image positioning
– flexible multifunction connection plate for direct attachment to camera tripods and mounts
– Well corrected doublet lens with two special glasses (1x lanthanum) for a clear contrasty image

Two inch Crayford focuser with 1:10 micro reduction

The 2 “Crayford keeps even heavy accessories secure by using reinforced ball bearings It guarantees a very precise adjustment with 1:10 micro reduction. If you have focus set accurately you can fix the position with a knurled screw. Long exposure times are possible without adjusting focus.

Imaging with the TS 70mm f6.78 Quad:

Just connect your DSLR or CCD camera through a 2 “focal adapter or via the M48 screw adapter.

This Apo is  optimized for imaging, but it also offers very good performance for visual observation.

The focal position allows the use of 1.25 “diagonals or Amici prism for erecting the image.

You can get, eg with a 32mm Super Plössl, a gigantic field of view of 3.5 ° at only 14x magnification.

You have the perfect overview.

With a 3mm Planetary eyepiece you get 148x magnification and can observe details on the moon and planets very well.

Technical data: –

• Aperture 70mm – 474mm focal length 
• F ratio f6.78 – lens doublet lens with two special glasses (1x lanthanum) for good color correction 
• Multi-coating on each glass-air surface 
• Focuser 2 “Crayford Dual Speed ​​reduction with reduction to 1.25” 
• 310mm length with retracted dew cap 
• Photographic resolution 1.65 ” 
• Visual limiting magnitude 11,9Mag
• Weight 2.5kg 
• Photographically usable field with full illumination of 32mm diameter

A carrying case is included!

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 Aperture 50mm – 330mm focal length – Focal Ratio f6.6 – 50mm ED doublet lens with an air gap

The TS 50mm ED APO from Teleskop-Service  provides an image with pure colours.

This compact telescope is ideal for day or night observation.

At the same time the refractor is also a bright and compact telephoto lens with 330mm focal length for digital cameras.

The refractor telescope is a real trip with transport length of only 25cm and weight of 1270 grams.

Nevertheless, it has all the advantages of a professional astronomical telescope.

Features of the TS 50mm f6.6 ED Apo: – 50mm ED lens – zweielementig with air gap – for contrast imaging – particularly compact by retractable dew – Transport length only 250 mm – high quality CNC extract with 45mm free aperture, 1:10 micro reduction, 360 ° rotation – Full coverage and good field corrector for digital cameras to APS-C format – Gigantic field of more than 5 ° (10x the Full Moon next to each other) , the CNC extension with SC thread Connection: The CNC tilting eyepiece also holds heavy cameras or without eyepieces. The central screw fixes the desired pull-out position. This is very convenient for photography. By 1:10 micro reduction can be particularly accurate focusing and meet 100% the exact focus point. The focuser offers the SC connector for additional adaptations and a reduction to 1.25 “for visual observation.

The TS 50mm ED Apo f6.6 as a telescope or spotting scope for nature observation: For daytime use we recommend an Amici prism for an upright and laterally correct image (as with binoculars). The pleasant view will allow for hours of relaxed observing at a contrast performance that is normally achieved only with considerably more expensive APO spotting telescopes. For night observation we recommend a quality dielectric 1.25 “diagonal with 99% reflection or T2 prism, to preserve maximum light and contrast.

A few recommendations for meaningful magnifications: 10.3 x magnification .. – 5 ° field of view – Part No. TSSP32 … 32mm Super Plössl -an excellent overview magnification for maximum field of view – very nice for the Overview for astronomical observations but also for nature watching. 27.5 times magnification – 2.5 ° field of view – Part No. TSWA12 … 12mm wide-angle eyepiece with 70 ° field for medium magnification and resolution.. 41.2 times magnification – field 1, 4 ° – Art. Nr. NED8 … 8mm wide angle with 60 ° field of vision for more resolution – very suitable for bird watching, when it comes to details. 66 x magnification – 0.9 ° field of view – Part No. NED5… .. 5mm wide angle with 60 ° field of view for a very high resolution – for maximum detail recognition in the plumage of birds 103 times magnification – 0.58 ° field of view – Part No. HR3 … 3.2mm Planetenokular with 60 ° field of astronomical observations.. (Moon, planets, double stars …)

The TS 50mm ED APO as fast aperture 330mm f / 6.6 telephoto lens: With the optional T-adapter and T2 ring you can connect your digital camera directly to the ED Apo and get a bright and high-contrast telephoto lens with the following data:– Focal length: 330mm – fixed iris: f6.6 – Focusing: manually with 1:10 micro reduction – more precise than a classical telephoto lens you can Apo Tele still operate from the open hand. . Of course, you also have a 1/4 “tripod connection The special feature is the focus area of about five meters to infinity.

The TS 50mm ED APO as a super-seeker and guide scope for astrophotography:

The TS 50mm f6.6 APO refractor makes a Super viewfinder with outstanding image quality and a superb guiding scope with the optional viewfinder mounting.

Technical data for the TS 50mm f6.6 ED Apo: – opening: 50mm – Focal Length: 330mm – aperture ratio : f 6.6 – Tube: Transport length 250mm / diameter 60,9mm / weight 1270 grams – Focuser: CNC extract with SC thread connector and 1.25 “connection with micrometer scale – 1:10 Micro

Supplied with the TS 50mm f6.6 ED Apo: – optical tube with eyepiece – cover for the lens and eyepiece – CNC pipe clamp with 1/4 “tripod mount – Prism rail (GP Level) with slotted holes and 1/4 “tripod mount – Viewfinder shoe on pipe clamp for standard Viewfinder (Vixen, Skywatcher, GSO …) eyepieces, Zenit prisms and adapters are not included.

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Another application for the Female T2 to Male M48 Adapter Ring is the reduction of a 2″ filter thread to T2. Screw the adapter ring into a female M48x0.75 thread and a female T2 thread becomes available.

The adapter ring itself is only 2.5 mm deep and effectively “disappears” into the M48 x 0.75mm thread so has effectively zero optical length.

On one side, the adapter has two slots to make adding and removing it easier.

Female thread: T2 – M42 x 0.75mm

Male thread: 2″ filter thread – M48 x 0.75mm

Depth: only 2.5 mm – the physical length is optically not effective, as the adapter is completely       “hidden” within the connecting adapter or accessory.

A “partner” adapter is our low profile Female M48 to Male T thread Adapter

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Neutral Density filters are used to reduce glare on bright objects, thus improving observing comfort and increasing contrast.

The TS ND 06 is a medium grey filter
We recommend this filter for telescopes up to about 130mm aperture and in cases where you desire a moderate reduction in image brightness.

Applications
Grey filters can be used for planet observing, solar observing (only in combination with a true solar filter!) and for nature observing. The function is similar to regular sunglasses – the image brightness is reduced, meaning less strain for your eyes. The filter can be used visually and photographically. A ND filter is also helpful for observing binary stars by reducing the glare of the brighter component.

Adaptation
The filters are simply screwed into the 1.25″ filter thread of the eyepiece or camera adaptation.

Transmission
The smaller the percentage of light transmission, the stronger the filter is. For example a 25% filter will allow 1/4 of the light to pass through, while the rest will be blocked. A 12.5% filter will transmit only 1/8 of the light.

Scope of Delivery:
— Grey (Neutral Density) Filter 1.25″
— Protective box (plastic)

The post TS Neutral Density Filter ND 06 – 25% Transmission appeared first on Modern Astronomy.

The TS Universal 2-Inch Field Flattener for Refractors from f4 to f9 is a flat field imaging corrector for almost ALL refractors with a 2″ focuser, producing pinpoint stars from centre to edge!

The flattener has an optical diameter of 45.5 mm and offers reduced vignetting compared to narrower T2 types. Fitting is M48 at both ends.

For most refractors the optimum back focus distance is around 109mm from the M48 thread to the camera’s sensor.

Experience has shown that the flattener has a large tolerance for deviations from the ideal distance. A 5% deviation does not cause any deterioration of the image quality with an APS-sized sensor.

For smaller sensors somewhat larger deviations may be acceptable, but please bear in mind that for the best resolution the distance should be set as precisely as possible.

For refractors with a fast focal ratio we recommend a longer back focus distance of approximately 120-123mm.

Please ask if unsure about adaptation and spacing!

Item Code – TSFlat2

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• deluxe focuser with index marks for fine focusing of CCD cameras and eyepieces
• 2 screws fix the focus position
• M48 x 0.75 female thread on the telescope side and M48 x 0.75 male thread on the camera side
• you also can use the focuser as a variable M48 (51mm to 91mm) extension

A true helical focuser like this TS Helical Focuser, works like a camera objective… when you turn the focusing ring, neither the lens nor the camera (or eyepiece and diagonal) rotate – The only motion is in and out.

The advantage of this helical focuser is the fine adjustment possible, in part due to the fine pitch of the focusing ring’s thread, and in part due to the large diameter of the ring.

In the case of the TS Helical Focuser, virtually backlash-free movement and graduated markings on the focuser allow repeatable return to the focus point simply by noting the focus position reading.

Features

• no rotation of the diagonal or camera – motion is only in and out
• wide focus range … 51mm minimum height / 91mm maximum height
• simple adaption to the telescope tube with the M48 x 0.75 (2″ filter) thread
• good solution for self build
• simple adaption to camera and / or eyepieces
• wide free aperture of 45mm
• also good for use as a variable M48 extension (51mm to 91mm)

The Helical focuser has a wide focusing range of 40mm. The focuser is very short, the minimum heigh is 51mm. So you can use the focuser on telescopes or tele objectives with reduced back focus.

Specifications:

• non rotating helical focuser with index marks and fixing screws
• connection thread on the telescope side … female M48 x 0.75 thread (2″ filter thread)
• connection thread on the camera side … male M48 x 0.75 thread
• minimum height … 51mm
• focusing range … 40mm

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