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Showing results for tags 'blocking filter'.
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I am writing this post as I have just received and fitted a free replacement lens supplied by Lunt that has fixed my Blocking Filter and revolutionised my views... The Story I had begun to get a feeling whilst using my solar scope that it was getting more and more difficult to (1) get an initial view that I was happy with (2) almost impossible to increase magnification and get a sharp image (3) the sweet spot was shrinking I removed the Blocking filter and looked down the long extension tube to see a grimy looking front lens inside I searched on the internet and found a picture of a new one and saw that the front lens was supposed to be clear. I set about cleaning it with Baader Wonder Fluid and the cleaning cloth which got rid of at least 80% of it, but a thin film remained (see pic). After more internet searching, I found a post on cloudynights that showed the exact same problem being suffered by other folks and stated that Lunt were happy to send out free replacement lenses! https://www.cloudynights.com/topic/534161-lunt-60-mm-double-stacked-solar-scope-blocking-filter-issue/ https://www.cloudynights.com/topic/433046-polishing-optical-acrylic-lens-element-in-a-lunt-s/ So, I took some photos of the scope, blocking filter and sales invoice and emailed Lunt USA on Monday this week. On Tuesday (the next day!), Bresser Germany emailed me to say that Lunt had asked them to send me a free replacement lens (Great!) The Lens arrived this morning (just 4 days after emailing Lunt!) and I fitted it into the Blocking filter following the supplied instructions, then headed out to view the sun... Here is the glass as received... Here are the supplied instructions... Here is the blocking filter after I fitted the replacement glass (Looking very transparent) ... WOW, WHAT A REVELATION! (1) The image is so much brighter (2) The sweet spot is so much bigger (3) Higher magnification is no longer an issue and some lovely surface detail revealed itself ... I would encourage all Lunt Solar Scope owners to go check the front lens of their blocking filter for any signs of fungus or growth and if you find some then don't hesitate to email Lunt USA for a replacement. Happy Solar Viewing, Alan
I was doing some solar observing and was puzzled by the haze i was getting in the eyepiece especially as my white light scope was showing clear. After some checking found that the entry lens on my B600 blocking filter has something on it, see picture. Tried cleaning it off with an optical cloth but it remains. Has anyone got any ideas what is the problem and what to do about it, is it something that I can do myself or will it require sending to Lunt for fixing.