Saturday, 17 July 2021
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Hi,
the stars in the corner are not round and show aberrations. Can this be fixed ? pier14 corner stars.jpg
2 years ago
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#3305
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Hi Vikas, we have been discussing this on the P14 forum section for some time, its due to the FSQ F3.6 reducer/corrector spot size, as well as it only corrects 44mm image circle.

The ZWO 6200mm Pro camera fitted has tiny 3.7un pixels which are way below the spot size of the corrector and to add insult to injury at 35mm its at the outer limits of what the corrector will correct. This is the reason we have been considering running native F5, as the FSQ has far better correction when setup this way. From memory it's an 80mm corrected image circle and will give virtually full illumination across the whole sensor.

I was going to do this change over on the last visit a few weeks ago but the other members asked me to leave it as is until after the big summer nebula season?

Cheers

Steve

Please ignore my dylexia wherever possible, just be thankful I can control my Tourettes ;)

Things to do, so little time!

Steve
Roboscopes Tea Boy


2 years ago
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#3306
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Hi,
i figured as much. Please dont change the reducer and make it native. In such a widefield, one cant make out the stars unless u are really pixel peeking anyway.. The reason why i subscribed to this system is because of the wide focal length. Please let it run for a year which is when my subscription ends. Roboscopes wud be breaking their contract terms if you change it and i will take strict legal action !!!

Just kidding, but please dont change it for heavens sake, pun intended.....

cheers

vikas
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Hi Steve,
Just like keeping you on your toes now and again.

My vote is to stay reduced for the time being. There are already several projects for which data has not been fully or even started to be collected and given the erratic skies and the moon waxing, it's very unlikely that they will all be done in time. In addition we are now fully entering the season where the wider fov will be a real asset. The Sadr region being one example. Once we go native then it will need to remain that way, at least until this time next year or permanently. So I reckon it makes sense to leave well alone for this visit and more importantly give you a bit less to do while there and return home sooner. :)

Cheers,

Ray


I agree.

Richard


Hi,

Apologies if the quote I'm trying to use has not appeared above. I'm hopeless when it comes to making anything other than a straightforward posting.

Steve had made that suggestion to go native and eliminate those bad star shapes and asked us, the only 2 members at the time, what we wanted to do. On such wide fields of view we get and particularly so with mosaics, we kind of accepted the stars given the amount of sky we could capture, particularly during our summer season. Once the scope goes to its native focal length we lose those opportunities for the mosaics. An equivalent mosaic,whilst giving higher resolution, would mean more panels and many additional subs due to the reduced light gathering capacity. At a future date we reckon removing that reducer permanently would be a good thing to do, so I hope that this compromise sits well with you Vikas. Hopefully you'll find that when you look at the resulting images you'll be acceptably zoomed out such that the stars do not too bad. At 1:1 they're awful!

While I was typing this I noticed that you'd already replied Vikas. I'm glad that you're not upset.

Regards,

Ray

Ray
Roboscopes Guinea Pig


2 years ago
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#3308
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On the contrary, i am happy that my suggestion of not to change has some support.... may it stay this way for many years!!

cheers

vikas
2 years ago
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#3309
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On the contrary, i am happy that my suggestion of not to change has some support.... may it stay this way for many years!!

cheers

vikas


Agreed Vikas. The extraordinary field of view is what makes this pier special.

And welcome to the syndicate!
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