![]() ![]() ![]() 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 Many imaging enthusiasts like the look of spikes on bright stars, and they add them by placing some kind of mask in front of the aperture to mimic the effect of a Newtonian reflector’s spider vanes. The threading is standard thread - leftĢ) If the telescope is a carbon fiber tube, the dew shield The diffraction spike sets apart a star in the Hubble Ultra Deep Field. The end of the focuser sticking into the light path creates a straight line perpendicular to the spider vane and therefore creates a diffraction spike perpendicular to the diffraction spike of the spider vane. 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 A straight line cutting into the light path causes a diffraction spike perpendicular to that line. 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 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. The top layer of the sandwich contained the diffraction spikes around Jupiter, its moons, and distant background stars. Remember any dramatic movement of the grub screws can/ will affect the overall collimation of the objective - that's why they are there!!! I ended up sandwiching the Puck photo between two different versions of Fritzs wide-angle. 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. I'd say definitely caused by the collimating grub screws - I've seen it on an older ED80. ![]()
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