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When I'm imaging using an F/10 SCT, focusing on a star will result in a wobbling image. So far I've assume that this was caused by turbulence in the upper atmosphere, since the meteorological website I use always state that there are jet streams at >30m/s, whenever the sky is clear, but I wonder how big of an effect telescope temperature has om imaging quality.

Another experiment?? You might find a similar improvement as when you got your ADC? I use the hair dryer as well and it definitely destroys the image for the minute or two it takes for the corrector plate temperature to stabilize.

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I prefer a short dew shield vs a dew heater (12-inch SCT). The dew shield doesn't even have to be that long to be effective. I purchased and TRIMMED an AstroZap dew shield so it only protrudes about eight inches (2/3 of the objective size) in front of my OTA. And it works 95% or more of the times.

I fabricated my own dew shields from aluminum sheet available from your local big-box store. I use approximately 1 diameter of extension. Use aluminized heater duct tape and then spray paint the entire thing with flat black stove paint. Has held up on my 10" for going on 3 decades. Kept the dew at bay the last two nights when the dew point and temp curves in Astrospheric were within one degree of each other all night.

I have always been a fan of dew shields. Not only for keeping dew at bay, but also to help shield the scope from my neighbor's annoying security lights (one might call them "insecurity lights"). There is the odd time when the humidity climbs to 98%, where just having the dew shield isn't enough to prevent dew on the corrector, so a Kendricks dew heater was used. Didn't notice any ill effects from using it, but then again the seeing is rarely wonderful here.

I built my own dew heaters, the first about 15 years ago. They are permanently fitted onto my 8" and two 9.25" telescopes, finder scopes and guide scopes. Definitely need them in Melbourne, even with a decent dew shield - I use the Aluminium Astrozap dew shields. My 9.25's are permanently outdoors.

The power is supplied via a MOSFET controlled by a 555 timer to give a variable duty cycle. The heaters run with just a few Watt of power. I do have a hair drier on hand but rarely use it on the corrector plates.

Would love to see your results and why you came to that conclusion. I've tried with and without, and the best images I've gotten coincidentally have been with the dew heater on, and have struggled on the nights without one. I still hit it with the hair dryer between captures (neither is enough on its own.) On my old scope I used to run the heater at half power because it was visible at full power. But with the bigger scope, the same power supply doesn't heat as much so I run it at full.

Anyone using dew heaters you are wrong. Dew heaters cause thermals in the optics. This is not DSO imaging where you are using small f ratios. I did test a while back and evrn at the lowest setting it degrades the image. Im also in a stupid heavy dew area. Most nights the water falls out of the gutters like its raining. I use a hair dryer which disipates the fogging and allows the ota to cool back down quickly. Give it a try!

You can CLEARLY see the problem if you use a hair dryer on your optics. The degree to which the image goes out of focus is astounding and can take a minute or more to recover. The dew heater is doing the same thing just less dramatically. Mitchell is absolutely correct regarding dew heaters and hair dryers. Thermal convection is created by the dew heater (depending on where it's placed) that yield images degradation without question!! If that degradation is small enough for you to be happy with that's a different statement than saying there is no degradation. This is in fact the exact same argument people have about how good does your collimation have to be for planetary. In both cases, if you do NOT tweak every source of optical degradation out of your system you will NOT get the best planetary images that your system is capable of delivering. In both cases you do NOT have to wonder why you can't get the highest quality images comparable to the great imagers (wish I was one of them, but I'm working on it) on this forum.

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How to cope with condensation, these so called water droplets which shortcut your astronomical observations ? Choosing a telescope with an integrated heater, or add a heater to your instrument is the best way to get rid of it. This resistor produces heat around the telescope optics and decreases the humidity level, stopping the formation of dew.

Condensation is what the amateur astronomers are afraid of. When these water droplets stick to the lens or the mirror of your telescope, they have similar effect as filters and damage drastically the image quality. Not only the details decrease but also the amount of collected light.

Stellina integrates a dew control system, fully integrated and adapting to its environment automatically. . At Vaonis, we got the feedback from astrophotographers, their success stories, their biggest worries while capturing the night sky and their expectations. For now, Stellina telescope is the unique telescope in the mass market to offer an integrated heater.

For an optimal protection against dew, Vaonis did not chose to use a single resistor but ten heating resistors equally spaced around the front lens of Stellina. You probably already know that similarly to our toaster or electric heating, condensation heaters are big power consumers ! This is absolutely not an issue with Stellina since the system switches on only when it finds that the telescope must be warmed up, and optimize its energy consumption. Embedded temperature and humidity sensors inform the telescope in real time whether the condensation is likely to appear or not. ff782bc1db