I. Today's Sun I took a quick look at the Sun with a double stacked PST 40. AR1089 continues and there were two nice groups of prominences in the NE 1/4 and at the eastern limb. No pics were taken, but imagers at _The International Amateur Solar Database_ at 8-11 UT posted some images of the features that I saw later in the day. Borman's 17UT calcium image best captures what I saw at 14:30UT: Ca - Michael Borman,- Ill, USA 17UT - AR1089 and Prominences - full disk http://solardatabase.free.fr/vignette/upload_cak/pl_images/0_100725025349.jp... Ha - Philippe Vandendoorn - Belgium 9UT - Prominence http://solardatabase.free.fr/vignette/upload/pl_images/0_100724081507.jpg Ha - Erio Inglante Rossi - Italy 9UT - Prominence http://solardatabase.free.fr/vignette/upload/pl_images/0_100724070158.jpg Ha- Garcia-ribera, Eduard - Spain 12UT - AR1089 http://solardatabase.free.fr/vignette/uploald/pl_images/0_100724103014.jpg II. Solar reflective shields for the PST and small (9lb class) mount I finally got around to fabricating some white posterboard sun shields for the PST and my low end Celestron mount - held in place with velcro tabs. (I've seen much better Sun shade setups at the SLAS solar parties.) Without the shielding in hot afternoon weather yesterday (7-23), the PST double stack in 100 deg weather would overheat and seriously loose Ha bandwidth resolution. After about 20 minutes, the Celestron black plastic mount would overheat and the computer went crazy - sending the scope into an abended slew. With the white posterboard shielding, the black plastic mount base stayed at 37.4C (99.0F); and the housing around the PST double stack at 38.2C (100.8F). Max SLCC Airport temp for the six hours between 1pm and 7pm was 35.0C (95.0F). Even with the reflective shielding, there was a detectable degradation in the double and single stack PST Ha resolution as the Ha filter heated up over 20 minutes in true summer weather. III. Idea for Peltier cooling ATM project I have decided to add to my ATM just-for-the-heck-of-it project list, fabricating a light-weight Peltier thermoelectric cooling band to temperature control the double stack. I already have a 12 volt variable resistor dew heater controller for my dew strips. Basically, the idea would be to sew two thermoelectric cooler modules into an water-absorbing elastic fabric band and string them around the outside of the stack. I have seen some Peltier cooler modules from some Chinese company that are also sold on amazon.com - http://www.amazon.com/Peltier-Thermo-Electric-Cooling-Module-Amp/dp/B000TA58... and at Parts Express - http://www.parts-express.com/pe/showdetl.cfm?Partnumber=320-252 If anyone has any ideas on other component suppliers and components or this idea generally, please advise. To anyone's knowledge, has someone already done this and posted an article on let's say Cloudy Nights. Clear skies - Kurt _The International Amateur Solar Database_ http://solardatabase.free.fr/sol.php