The ultimate portable Astro photo and nature photography instrument!
SharpStar 61EDPH Mark II telescope features:
• 61MM f/5.5 three-element full separation optical design
• Includes one ED lens of Japanese Super ED lens
• New 2.5" dual-speed rack and pinion focuser, 10:1 fine focus
• 2" and 1.25" universal interfaces
• Angle adjuster for 360 degree rotation
• Universal dovetail bar
• Comes with a finderscope mounting bracket (shoe)
365ASTRONOMY TESTING PROCEDURES
We would usually test about 30 - 60% of the arriving Sharpstar and Askar telescopes (except the smallest ones in the FMA and ACL range). This will provide us with a good understanding of the quality of that batch of optics. We would also test the focuser and check the optical tube, tube rings and dovetail bar and accessories for any visible damage or fault and take a series of test images with a full frame DSLR camera of a specially designed test chart that will show whether the telescope is fit for a full frame sensor or not, whether the image is flat in all corners and generally it will indicate the quality of the optics, i.e. resolution. Whilst we do store this information for all tested telescopes, we don't usually include a printed report, but if you ask, we might be able to send it to you). If we find that the optics are not correctly collimated then we will send them to a specialist to correct it or if the optics cannot be corrected to a good performance then those will be sent back to the manufacturer for replacement, although our experience with Sharpstar and Asker telescopes is quite good, we rarely had to do that. We believe that there is no need to offer complicated optical test reports that would assume a degree in optical sciences from the user to fully understand them.
The SharpStar 61EDPH refracting telescope is a three-element fully separated design that includes one exotic ED lens (ultra-low dispersion ED glass) and multi-layer coating on all surfaces to reduce internal reflections.
The SharpStar 61EDPH provides a very good observation and imaging system thanks to its fast focal ratio. The unique three-element design incorporates a special ED lens, which helps to control chromatic aberration very well, makes the stars look sharp, and the image more vivid.
The SharpStar 61EDPH provides an impressive focusing system combined with an excellent optical system. The SharpStar 61EDPH has a high load dual-speed 2.5-inch rack and pinion focuser with a 1:10 aspect ratio compared to many refractors on the market that use a toothless focuser (i.e. Crayford). Rack and pinion focusers can bear a higher load due to their construction, so you don't have to worry about wobbling or loosing focus when using heavy-duty observation accessories or a heavy camera. In addition, the 360-degree rotator allows you to easily rotate the camera to achieve the best image framing. The 2-inch eyepiece holder barrel features a brass compression ring, so that you won't scratch your accessories.
The dedicated unitary tube rings with hollow design and streamlined handles is not only fashionable, but also beautiful and you can attach some accessories as well (i.e. guide scope). The 61EDPH package also contains a 10cm long dovetail plate, it features a 1/4" photo thread in the centre that allows the scope to be mounted on a tripod for daystar nature photography as well.
The SharpStar 61EDPH is a reasonably priced observational or imaging tool with fast-focus ratio that features exotic super ED glass, high quality heavy duty 2.5-inch rack and pinion focuser; when compared to other similar products on the market, its value is self-evident.
In addition, the 61EDPH can be equipped with our dedicated 2.3-inch field flattener for FULL FRAME astrophotography, which provides excellent image quality and avoids field edge star distortion.
DEDICATED FULL-FRAME REDUCER (optional extra)
The following discussion will focus on the separately available dedicated full-frame reducer for the SharpStar 61EDPH, because it meets the requirements for full-frame photography.
The optional reducer/field flattener is equipped with a 2.3" tube, one end of which adopts a M63×1 thread and connects to the rack-and-pinion focuser of refractor telescope. The other end adopts a M48×0.75 thread, the focal plane is 55mm from the end interface. If you need to expand, it can measure up to 99mm by removing the end interface and adapting your own accessories, which fully meets the requirements for attaching a wide range of photographic accessories, i.e. CCD or CMOS camera with OAG (off-axis guider), electronic or manual filter wheel, etc. The reducer features a three-element fully air separated structure, which helps to support full-frame photography and achieve excellent vignetting free images. The reducer is specifically designed for deep-space widefield Astro photography with a focal length of 275mm and a focal ratio of f/4.5. In addition, the 360-degree rotator allows you to easily rotate the camera to achieve the best image framing.
Technical parameters:
Aperture: 61mm
Focal length: 335mm
Focal ratio: 5.5
Objective type: three-element full separation composite achromatic
Net weight: 1.42kg (excluding tube rings and dovetail plate)
Total weight: 1.80kg (including tube rings and dovetail plate)
Resolution: 1.93 angular seconds
Visual limit star rating: 10.7
Main tube outer diameter: 80mm
Total length of the lens barrel (shortened): 235mm
SPOT DIAGRAM OF THE NEW MARK II TRIPLET VERSION:
