TESTAR 50mm GUIDE SCOPE
Testar
Doublet
0.59 kg
TESTAR 50mm GUIDE SCOPE is backordered and will ship as soon as it is back in stock.
The Testar 50mm Guide Scope has a focal length of 190mm and a focal ratio of f/3.8. The objective is a fully multi-coated achromatic doublet for a greater optical precision. The border of the lenses are blackened to deliver a higher contrast.
The 69mm support rings have 3 screws with a nylon tip for a perfect alignment with the main telescope. Having the guide scope aligned to the main telescope increases the guiding accuracy and it reduces the field rotation displayed in the capturing camera.
The mini dovetail bar can be firmly mounted on any standard finder scope bracket so you do not require any extra piggy back dovetail bar on top of your telescope.
The 31.8mm / 1.25" non-rotary helical focuser permits a micrometric focusing adjustment while a quick release draw tube offers an initial coarse focusing.
Designed to use with many guiding cameras it can be used as a great optical finder by adding a 31.8mm diameter eyepiece. This 50mm compact guide scope has an accurate helical focuser that keeps the orientation of the connected camera.
Note that with rotative focusers the cables of the guide camera could get twisted while focusing.
The precision helical focuser has a 10mm travel while the fast focus device has a 30mm excursion.
Specifications
| Objective lens diameter | 50 mm |
|
Focal length |
190 mm |
|
Camera/eyepiece connection |
1.25" and male M42 |
| Weight | 588 gr |
| Max tube length | 245 mm (focuser fully extended) |
| Focus travel | 0~40 mm |
| Focuser type | Non-rotative micrometric with locking screw |
| Dovetail Specifications | 30.8 mm x 89 mm - fits finder scope brackets |
| Dovetail threads |
1 x 1/4" , 2 x M8 female thread |
Included items
- Guide scope 50mm
- Tube rings
- Objective lens cap
- Eyepiece cap
- Mini dovetail bar for finder scope brackets
- x 6 nylon tipped screws
- x 2 bolts for dovetail-tube rings connection
- Allen key
Customer Reviews
Needed a longer focal length guidescope for imaging with refractors at 800 and on impulse on of 1050mm, and was not prepared to learn with an oag at this stage. I was a bit nervous whether the positioning screws would cause me any issues but 50mm Guidescopes were scarce on the net so I decided to give this Testar guider a trial. Had intended to use it with a full size 290mm cam, so I was pleased it could take normal size cameras. However with only small periods of marginally clear sky and not very good seeing, I ended up using it with the smaller format camera of the Mgen 3 (Note: The MGEN3 is normally used to guide at focal lengths of about 400) attached to a bulky 12 kg or so 1050mm triplet refractor on an AZEQ6 fitted with the Geoptik triangle also from Testar and hand focussed using just the back screen on the Nikon 5600.
I was very happy with these results given the equipment used and the conditions.
Omega Centauri was based on 20 minutes of captures, M100 was 2 hours and no star reduction software used.
