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 Post subject: How's your PST?
PostPosted: Mon Oct 21, 2019 9:48 am 
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Joined: Mon Jan 09, 2006 11:05 am
Posts: 5282
Location: Lancashire
There are two filters in the MEADE Personal Solar Telescope. The blocking filter is positioned at the bottom of the eyepiece tube and shouldn't need replacing. The second filter, referred to as the Internal Trim Filter for blocking infra red to avoid eye damage, is located at the bottom of the tube below the eyepiece tube that screws into the black box.
Unfortunately, the ITF is prone to fogging up. Some ITFs fog within a matter of weeks, while others can last for years. The fogging is caused by moisture affecting the filter's laminated coatings.
Recently, I sent off for a replacement ITF to Beloptic in Germany. This supplier has a good reputation for providing an excellent range of quality filters, and it's claimed that its ITF replacement filter doesn't fog like the MEADE one.
After having inserted the new ITF, the Sun appeared to be too bright, so that the "orange peel" effect wasn't evident. Has anyone had a similar experience when replacing an ITF? Inserting a polaroid filter to moderate the brightness didn't make any difference for revealing surface detail, although a variable polarizer might help.

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Last edited by brian livesey on Tue Oct 22, 2019 12:02 pm, edited 1 time in total.

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 Post subject: Re: How's your PST?
PostPosted: Mon Oct 21, 2019 12:11 pm 
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Joined: Tue Dec 05, 2017 11:53 am
Posts: 503
I had a PST for 10 years no problem then sold it, a year later bought a pre owned one, again no problem

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Celestron 8" Edge HD Evolution, Esprit 120mm triplet, 72mm APO, Sky Tee 2, 6" reflecting scope, William Optics Binoviewer, Quark Daystar Ha Chromosphere on 72mm ED, LVW8mm eyepiece and Celestron 19mm Axiom, matched W.O 10 and 20mm, and a few others, D4s, D810,

For info, I am Autistic, Aspergers, ADHD, therefore if I come over as a little "short" on occasions it is not intended, thank you


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 Post subject: Re: How's your PST?
PostPosted: Mon Oct 21, 2019 12:48 pm 
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Joined: Sun May 11, 2008 6:11 pm
Posts: 3270
Location: Portslade, Sussex Lat 50deg 51min Long 0deg 13mins West
I sold the PST that I bought when I retired about a decade ago. The Sun became moribund as did my interest in observing it. I even tried to use it for a solar eclipse but the Sun was too deep in the clouds to use it. The friend that bought it still has it but do not imagine that he uses it much. Would have been good for the Mercury transit next month but I guess protection should suffice so long as the damned clouds do not destroy the view!
Regards maf


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 Post subject: Re: How's your PST?
PostPosted: Tue Oct 22, 2019 12:14 pm 
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Joined: Mon Jan 09, 2006 11:05 am
Posts: 5282
Location: Lancashire
There's no denying that the Sun is a bit "moribund" at solar minimum, but previous to this I've had good views of solar phenomena with the PST, and with the option of double-stacking with a Lunt LS50F etalon ).
The other PST, stage 1 modded to a 70mm refractor, is good for closer views of prominences.

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