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I am thinking of getting a Lunt 50mm scope. I want to image as well as observe. I am thinking I could put my ZWO on the scope and capture video. My question is, does focal length in a solar scope relate to the FoV as it does for a non-solar scope? The field of view calculator (http://www.12dstring.me.uk/fovcalc.php) suggests I could just about get a full disc with a focal length of 350mm (the 50mm Lunt), but not with a focal length of 500mm (the 60mm Lunt). Is my logic correct?
For sale is my Lunt LS60THa/B1200FTPT Ha scope. The scope is in MINT condition in the original flight case as it came from FLO. This is the Pressure Tuner version also with the B1200 blocking filter allowing for a larger field for observing AND imaging. It is also equipped with the magnificent Starlight Instruments Feathertouch focuser with 1.5" travel and 10:1 reduction which makes focussing for imaging cameras so sweet. The diagonal comes ready equipped with the T2 camera connection. Pick up here near Harrogate is possible or I do also have the original LUNT packaging so it can easily be picked up by the courier of your choice at your risk. I can provide box weight and dimensions should you wish to do so.
£1940 by bank transfer please. This price includes the ADM dovetail and Televue Sol Searcher I purchased as extras. If you don't want these items then deduct £40. Pictures below including some images taken using this scope and a ZWO ASI 174 Mono camera.
I pointed my solar telescope at a small prominence in the hope that it would do something whilst I imaged it. Because I am new to solar imaging I don't know whether this is particularly lucky, or if it's something that's easily caught. Over the space of about an hour I captured 18 videos, each of 1000 frames, using a mono DMK21. I stacked 10% of the frames, and then manually went about aligning and cropping the 18 stacked images because ImPPG didn't like to do it for me. I also took an image of the solar surface, just to get rid of the white in the image, and add something visually interesting to the solar disc. I used a curves adjustment to make it orange, and then made a movie in MS Movie Maker.
Hope you enjoy it!
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...
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!
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,