Pinched OpticsShipping set screws adjustment. ![]() I know this is specific to ED80s, but would have helped me a bunch. The images here are with an ED80, but the procedure is ![]() To prevent the optics from misaligning during situations ofĮxcessive vibration, reinstall all set screws. Three sets are covered inĪ rubberized sealant. Once the dew shield is off, you will see six groupings of Diffraction spikes what they are and how to get them right. The threading is standard thread - leftĢ) If the telescope is a carbon fiber tube, the dew shield The screws are hidden by the dewġ) If the telessopce is an Essential Series white tube orĪn FCD100 white tube, the dew shield unscrews from To remove the pinch, you need to access nine set screws Wedge shapes projecting from bright stars. The pinch, which is visible on astrophotographs, looks like Why do radiowave signals bend around mountains into the valleys below whereas microwave (Cell phone) signals get blocked by them Radiowave signals have a. Set screws using the included hex wrench. Sessions, it is recommended that you loosen the shipping Pinched optics are noticed during astrophotography Shipping, set screws have been installed at the factory. "To prevent the optics in this telescope from moving during Basically, there are some shipping screws on ED80s which need to be loosened. I know this is an old thread, but on searching I didn't find anything to resolve this so I'm posting some info here provided to me by Scientific Explorer support when I raise a ticket for this for my ED80, in case it's useful for others. Remember any dramatic movement of the grub screws can/ will affect the overall collimation of the objective - that's why they are there!!! If pain persists then get someone (supplier/ experienced user) to carefully carry out further re-adjustments - of the grub screws on the front and rear elements. DO NOT tighten these screws - this could lead to permanent damage to the lens. Get the correct Allen key/ instrument screwdriver (depending on the telescope maker) and gently back off each grub screw on the front element by no more than 1/8 of a turn (or less). You can, by placing your finger in front of the edge of the objective determine that the notches match up with the radial position of the grub screws (rather than the spacers). Visually you can check by pushing a star out of focus to show a bright circle, you should then the the "notches" in the edge. Of course, all popular focusing aids, like a bahtinov mask, also work with the double spider.I'd say definitely caused by the collimating grub screws - I've seen it on an older ED80. As soon as the spikes are clearly merged to one, focus has been exactly reached. This makes focusing on brighter stars easier. This image of the Pelican nebula was made with a TS ONTC Newtonian with double-spider.ĭouble spider vanes as focusing aid:Twin spider vanes are more sensitive to slight blurring due to inaccurate focusing than a single spider vane. The diffraction effects caused by the spider remain minimal.ĭo twin spider vanes cause twin diffraction spikes at the stars?Of course not! Once you have attained precise focus both spikes will merge into one very fine spike. ![]() This means minimal obstruction and extremely fine, subtle spikes around the brighter stars. The carbon vanes have a thickness of only 0.4 mm. TS Double Secondary Mirror Spider made of Carbon Fiber for highest stability and minimal diffraction effectsDue to the double spider vanes of carbon fibre which have 11 mm distance to each other, the stiffness after mounting matches the one of a metal secondary mirror spider with vanes of 5 mm diameter.
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