I ordered a Quark Combo from Woodland Hills & Telescope and it arrived yesterday just in time for a first light in the late afternoon. I set it up with a TS 102ED f/11 and a 2x Powermate. The Powermate was first inline with a UV/IR filter screwed in the front which put the scope around f/27, due to the extended distance to the Quark. Following the Powermate was a 2" GSO star diagonal. Into the star diagonal went the Quark. Into the Quark went a TeleVue Binoview without the amplifier/Corrector. And in the TeleVue Binoview was a pair of Meade Series 5000 HD 25mm; which gave about 112x. So far so good.
The Quark took only 8 minutes to come on band and was ready by the time I had everything set up.
The sun had moved behind a tree by that time and the branches were doing sought of a strip tease, allowing only flitting glances of the sun as they stirred gently in a breeze. But in those initial glances I got excited by what I was seeing. At long last the sun past from behind the tree and I got my first real look. Wow, what a view! Razor sharp along the edge with a single prominence surrounded by a prairie fire. The orange skin texture of the chromosphere was identifiable but not with much detail at this point. The Quark was still just on the default setting. But the sharpness along the limb was amazing. And then it happened...
I moved the scope to the opposite side of the sun and noticed what appeared to be a shadow along the limb, covering about 1/3 the circumference of the sun. It didn't look right. I switch star diagonals, changed eyepieces (Badder zoom and Celestron Omni 32mm). Rotated the eyepieces to see if it moved. Nothing worked. And by that time the sun was behind the tree line. Not so good.
Morning came and it was my good fortune skies for the most part were clear. But distance clouds to the west threatened to move in before noon. A quick breakfast and I was out the door setting up in the garden. With everything in place I lower my eyes to the binoviews and saw what I was hopping was just an anomaly caused by the low altitude of the sun or some unseen tree limb the day before. But the shadow along a part of the solar limb was still there.
Several attempts to isolate the problem failed. I removed the star diagonal and inserted the Quark straight into the Powermate in case it was a misaligned diagonal mirror. I noticed this time the shadow moved. So I knew was on to something. I rotated the Powermate and kept the Quark in the relative same position. The shadow was more or less in the same place. I then rotated the Quark and the shadow move with it! And each time I rotated the Quark the shadow moved relative to the side of the temperature control switch.
I reassembled the optical train as it was originally and saw the shadow again. Then rotated only the Quark and the shadow once again move with it.
I'm now waiting to hear back form Daystar. Has anyone else experienced this problem?
Edited by ICit2, 10 September 2019 - 06:51 PM.