What do you make of this Celestron 5 optical performance?

Started 1 month ago | Questions thread
OP DavidWright2010 Senior Member • Posts: 2,126
Re: What do you make of this Celestron 5 optical performance?

AstroDan wrote:

Hi David,

There are a couple things for you to look into with the C5. The first is collimation, as the system may require a small adjustment to produce the best results. The second is ensure you are allowing the C5 to cool down and acclimate before imaging with it. If the air temperature inside the tube is higher than the surrounding air temp it results in tube currents and localized seeing effects. The C5 is pretty small, so it shouldn't take long to cool down.

Cheers,

Dan

I turned the focus past the best focus and see this. Doesn't this blowup of stars near the axis show that collimation is pretty good?

Since the nighttime star and moon photos were much worse than the daytime resolution chart,  thermal current may be an issue. It's going to be clear tonight and I will image the Polaris starfield again.

David

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