17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

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17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by yltansg » Tue Apr 17, 2018 2:53 pm

It was a colourful sunrise
Image

Followed by lots of clouds and turbulent seeing.
Image

This is the 4th of my 5 PST etalons. From the following result, it looks like one that belongs to the "just ok" 80% category. What do you think?

Image

At 9:55am local time, with x2.5 barlow
Image

At 10:25am local time, with x3 barlow
Image

At 10:40 am local time, with X2 barlow
Image

Alfred

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by ffellah » Tue Apr 17, 2018 4:32 pm

Hi Alfred: I like #3 the most, seems to be the sharpest. This etalon seems to be pretty good.

Franco

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by yltansg » Wed Apr 18, 2018 2:16 am

ffellah wrote:
Tue Apr 17, 2018 4:32 pm
Hi Alfred: I like #3 the most, seems to be the sharpest. This etalon seems to be pretty good.

Franco
Thanks Franco. I went back to look at the images captured with my first PST etalon. It may be better than this one. Unfortunately weather doesn't permit imaging today.

For the #3, my settings are -
Exposure : 26 mSec
Gain : 18643
Gamma : 1.88

This etalon is not bright even for me to bring the exposure to < 5 msec necessary for reducing the effects of turbulence.

Alfred

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by marktownley » Wed Apr 18, 2018 5:12 am

Looks good, makes sense what you say about it being a bright etalon, I was looking at the pictures before reading what you put and thought the images looked slightly soft, would make sense with a longer exposure not freezing the seeing.
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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by Valery » Wed Apr 18, 2018 6:22 am

The best F/D (on the camera chip) for IMX174 is about F/18-22. No necessity to go slower - you will not win in the detalization and sure will loss in ability to do a high resolution imaging with short exposures.
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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by Carbon60 » Wed Apr 18, 2018 6:34 am

A difficult test in turbulent conditions. It will be interesting to see the results when seeing improves.

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by MapleRidge » Thu Apr 19, 2018 12:45 am

A nice sample of what the scope/etalon can do...better seeing should make things better. I would say that image #3 is sharpest.

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by MapleRidge » Thu Apr 19, 2018 12:52 am

A nice sample of what the scope/etalon can do...better seeing should make things better. I would say that image #3 is sharpest.

Brian
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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by yltansg » Thu Apr 19, 2018 12:48 pm

Valery wrote:
Wed Apr 18, 2018 6:22 am
The best F/D (on the camera chip) for IMX174 is about F/18-22. No necessity to go slower - you will not win in the detalization and sure will loss in ability to do a high resolution imaging with short exposures.
Hi Valery,

I have tried imaging with longer exposure and confirmed that it doesn't help. Thanks.

Alfred

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Re: 17Apr18 - ARIES D-ERF on C8 + PST Etalon Images

Post by yltansg » Thu Apr 19, 2018 12:48 pm

Thanks Mark, Stu and Brian for your comments. From a few imaging sessions, I have concluded that this is the best etalon (out of the 5 that I have). However it is not able to deliver the high resolution I am looking for. I will continue to use it to find the best that it can deliver.

Alfred

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