Skywatcher 150 ed cloudynights


  • TS-Optics Photoline 60mm, f/6 FPL53 apochromatic refractor
  • Sky-Watcher ProED 100mm Doublet APO Refractor Telescope – Full Review for 2021
  • Sky-Watcher Esprit 100 Review
  • Image: Ade Ashford. I built my first telescope out of a mm diameter, two-element government surplus lens of mm focal length in the early s. Thus I had my introduction to the bane of simple lens-based instruments: chromatic aberration. I quickly learned that a simple compound lens composed of a sandwich of two types of glass with opposing dispersive prismatic colour-making qualities only goes a limited way to cancelling out this annoying inherent defect of refractors.

    The anti-reflection coatings are so good that it requires a bright source to render them visible to the camera. Such exquisitely crafted instruments from high-end manufacturers such as Takahashi and Astro-Physics use exotic glasses, ground and polished to complex geometries, to create compact refractors that provide essentially perfect imagery for visual and photographic use, but they usually command an eye-watering price.

    An ED glass manufactured by Ohara in Japan, known as S-FPL commonly written FPL53 , has very similar optical characteristics to fluorite, but it is less expensive, far easier to polish and is more stable, both chemically and thermally. Straight out of the box, the instrument tips the scales at just 1. The objective, which has a full aperture of 60mm, is fully multi-coated with the unblemished deep green hue that one comes to expect of a quality lens these days.

    The rear collar of the sliding dewshield, fine focusing knob, two-inch eyepiece-locking collar at the end of the focuser and the drawtube lock knob are all anodised in a striking red that contrasts with the otherwise wholly black and white livery. For the more conservative among you, TS-Optics provide a version of this instrument in a black and white finish with a gold-coloured fine focus knob. Inside the optical tube, which has an effective matte black coating, there is a single baffle about two centimetres behind the doublet.

    The remaining suppression of scattered internal light is provided by the The mm-long helically-cut brass rack has no discernible backlash against the pinion, and one full rotation of the ratio fine focusing wheel advances the drawtube 2. The drawtube is lockable once precise focus is found. Two-inch push-fit diagonals and accessories are secured by a non-marring brass compression ring via three clamping bolts at degree intervals.

    While the machining and finish of the tube, lens cell and focuser are all first rate and the instrument feels reassuringly robust in hand, I have a few niggles with the design. The end of the extended dewshield lies just 50mm in front of the objective, which is barely adequate. Given that there is still 50mm of tube behind the retracted dewshield, why not make it 50mm longer to ensure a full mm of dew protection and an effective light shield for daytime use? I appreciate that margins are tight these days, but a Vixen dovetail mounting rail and a finderscope mounting shoe should be standard equipment for a telescope of this calibre.

    Given the focal length of mm and the focal ratio, mature observers with fully dilated pupils of around 5mm would be advised not to use eyepieces with a focal length longer than 30mm if they wish to accommodate the full exit pupil. At the upper magnification range, one should be mindful that this is just a 60mm aperture telescope, so eyepieces with focal lengths shorter than about 3mm or the Barlowed equivalent are to be avoided.

    For my high-power tests I used a 3. Used in this configuration during the daytime, tiny yet intense specular reflections viewed in distant beads of dew revealed that the review instrument was perfectly collimated with a vanishingly small amount of under-correction. Defocusing the instrument a few waves intra-focally revealed symmetrical diffraction rings with a faint purple tinge, while the diffraction rings viewed the same distance extra-focally displayed a central reddish hue and greenish-blue periphery.

    For those observers intending to also use the instrument as a daytime spotter-scope for nature study or sporting events, I could focus on subjects just 7.

    However, for regular terrestrial use, an Amici prism star diagonal for delivering a fully erect image, plus a quality zoom eyepiece, would be good investments. The instrument has just one light baffle in the optical tube, but the interior of the drawtube has a finely milled finish with a matte black coating that is effective at suppressing scattered light. Note the non-marring brass compression ring and three clamping bolts at degree intervals to securely hold push-fit optical accessories or the supplied eyepiece adaptor.

    On an evening of moderately good seeing at the end of civil twilight on Monday 2 December, the six-day-old waxing lunar crescent presented a wealth of detail in the 3. In Mare Serenitatis itself, wrinkle ridges parallel to its eastern shore were similarly well seen. Further south, kilometre-wide Plinius prominently marked the boundary of Mare Tranquillitatis and I lingered a while on the southern edge of this lunar sea, near the famous landing site of Apollo One-hundred-kilometre-wide Theophilus intrudes into Cyrillus, the former clearly displaying its massive, terraced rim and central triple peak.

    Fortunately, Telescope-Service supplies an optional flattener and field corrector known as the TSFlat Furthermore, the TSFlat60 is also designed to deliver a fully corrected and illuminated field of view that is 41mm wide, hence cameras with full-frame sensors In tests with my full-frame Canon 5D Classic, aggressive image processing revealed negligible vignetting, while plate solving revealed a true field of view of 5.

    Given that the Canon 5D Mark 1 has 8. However, the field was indeed flat, albeit with negligible pincushion distortion. The TSFlat60 is designed to provide a fully corrected and illuminated field of view 41mm wide, hence cameras with full-frame sensors In tests with my full-frame Canon 5D Classic, the focusing range was from infinity down to just three metres away.

    However, the fact that one has to buy a Vixen-style dovetail bar and a finderscope mounting shoe in order to fully exploit these instruments for serious astronomical imaging almost suggests that celestial imaging is of secondary importance to the manufacturers — or it could just be that margins are so tight that these items are considered extras. Specifications: Optical design: FPL53 and lanthanum air-spaced doublet refractor Coating: multi-coated on all air-to-glass surfaces Aperture: 60mm.

    The Esprit is a triplet refracting telescope, meaning it uses 3 lenses to produce images with excellent color correction. Its compact size, precision focuser, and included accessories make this an attractive choice for amateur astrophotographers looking to capture wide, deep-sky images.

    From the moment I fastened the lime green mounting plate to its base, the Sky-Watcher Esprit APO has been an impressive optical instrument to experience. As with all of the items I review for astrophotography, I was not paid to endorse this telescope.

    This includes large nebulae like the Eastern Veil Nebula in Cygnus pictured below. Large galaxies such as the Andromeda Galaxy or Triangulum Galaxy are also possible using the right camera. The Eastern Veil Nebula captured using the Sky-Watcher Esprit ED Apochromatic refractors like the Esprit are perfect for deep sky astrophotography enthusiasts, because of their versatility, compact size, and imaging performance.

    With the right camera, large targets such as the North America Nebula will fit within a single image frame. This makes them a great choice for beginners because they do not require the level of tracking accuracy and autoguiding performance a larger instrument does. Make no mistake, this refractor is intended for deep-sky astrophotography, not planetary imaging or visual observations.

    The Sky-Watcher Esprit package does include visual accessories like a diagonal and finderscope, but I am yet to look through the telescope with my eye. Large deep-sky objects like the Triangulum Galaxy are a perfect fit for the Esprit As you can see in the photo above, the Esprit does a great job of capturing accurate star colors that are small and crisp.

    The field flatness and color correction of the Sky-Watcher Esprit ED is noticeable, even in a single exposure. My jaw nearly hit the pavement when I saw that first unprocessed image on the Veil Nebula appear on the screen.

    The three-element objective lens design uses high-end BK-7 and FPL glass which results in astrophotography images that are free of false color. The optical tube is roughly 15 pounds, very stocky and solid despite its compact size. The length of the optical tube assembly is just under 25 inches with the dew shield fully retracted.

    Here is a look at the Esprit with a number of imaging accessories attached in my backyard. My astrophotography setup including the Sky-Watcher Esprit refractor. To do this, I fastened a mm dovetail plate to the top of the tube rings that came with the Esprit.

    This allowed me to better balance my imaging configuration and left a spot for the Sky-Watcher 9 x 50 Finderscope in its native mounting bracket. Having both a finderscope and guide scope mounted to the Esprit means that I can easily run a 3-star alignment routine without swapping out the guide camera for an eyepiece. Features and Accessories The package I received from Sky-Watcher had everything needed to start imaging. This included an impressive number of accessories from a 9 x 50 erect-image finderscope to a padded aluminum case.

    The Esprit has a nice flat surface on top of the focuser drawtube to mount accessories like an onboard mini-computer or Pegasus Astro Pocket Power Box. The internal knife-edge baffles are designed to improve contrast and avoid stray light from entering the optical system. I believe all of the APO refractors I have ever used offer this feature, and the Esprit is no different.

    Esprit ED Specifications:.

    TS-Optics Photoline 60mm, f/6 FPL53 apochromatic refractor

    For the more conservative among you, TS-Optics provide a version of this instrument in a black and white finish with a gold-coloured fine focus knob. Inside the optical tube, which has an effective matte black coating, there is a single baffle about two centimetres behind the doublet.

    The remaining suppression of scattered internal light is provided by the The mm-long helically-cut brass rack has no discernible backlash against the pinion, and one full rotation of the ratio fine focusing wheel advances the drawtube 2. The drawtube is lockable once precise focus is found. Two-inch push-fit diagonals and accessories are secured by a non-marring brass compression ring via three clamping bolts at degree intervals. While the machining and finish of the tube, lens cell and focuser are all first rate and the instrument feels reassuringly robust in hand, I have a few niggles with the design.

    The end of the extended dewshield lies just 50mm in front of the objective, which is barely adequate. Given that there is still 50mm of tube behind the retracted dewshield, why not make it 50mm longer to ensure a full mm of dew protection and an effective light shield for daytime use?

    I appreciate that margins are tight these days, but a Vixen dovetail mounting rail and a finderscope mounting shoe should be standard equipment for a telescope of this calibre. Given the focal length of mm and the focal ratio, mature observers with fully dilated pupils of around 5mm would be advised not to use eyepieces with a focal length longer than 30mm if they wish to accommodate the full exit pupil.

    At the upper magnification range, one should be mindful that this is just a 60mm aperture telescope, so eyepieces with focal lengths shorter than about 3mm or the Barlowed equivalent are to be avoided. For my high-power tests I used a 3. Used in this configuration during the daytime, tiny yet intense specular reflections viewed in distant beads of dew revealed that the review instrument was perfectly collimated with a vanishingly small amount of under-correction.

    Sky-Watcher ProED 100mm Doublet APO Refractor Telescope – Full Review for 2021

    The foam-lined aluminum case provides sturdy protection from average bumps and jostles, and it will fit comfortably into any vehicle. It might not present the widest views of the sky, but it still delivers amazing deep space viewing with stunning brightness and accuracy. The Doublet APO lens keeps the fine details of these stellar objects in sharp relief, which is the most important part of enjoying them.

    Being a medium speed telescope, it also delivers razor-sharp lunar and planetary detail with only the merest hint of chromatic aberration at the edge of the bright lunar surface. Astrophotography One of the main reasons backyard astronomers buy the EvoStar ED is for its excellent quality astroimaging. The Sky-Watcher delivers crisp, clear images free of distortion.

    Sky-Watcher Esprit 100 Review

    Click the review for a larger image. However, these were rare comments and nobody making them said it was a deal-breaker. The Sky-Watcher Esprit package does include visual accessories like a diagonal and finderscope, but I am yet to look through the telescope with my eye. Large deep-sky objects like the Triangulum Galaxy are a perfect fit for the Esprit As you can see in the photo above, the Esprit does a great job of capturing accurate star colors that are small and crisp.

    The field flatness and color correction of the Sky-Watcher Esprit ED is noticeable, even in a single exposure. My jaw nearly hit the pavement when I saw that first unprocessed image on the Veil Nebula appear on the screen.

    The three-element objective lens design uses high-end BK-7 and FPL glass which results in astrophotography images that are free of false color. The optical tube is roughly 15 pounds, very stocky and solid despite its compact size. The length of the optical tube assembly is just under 25 inches with the dew shield fully retracted.

    Here is a look at the Esprit with a number of imaging accessories attached in my backyard.


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