PrimeGrid
Please visit donation page to help the project cover running costs for this month
1) Message boards : Aggie The Pew message board (Message 131143)
Posted 5 days ago by Anthony Ayiomamitis
@AA - are you anywhere near the area that was hit with the hail storm? If so hope everything is good with you. If not still hope everything is good with you.

Thanks for asking! All well and safe here. Northern Greece is taking a regular beating these days.
2) Message boards : Aggie The Pew message board (Message 131026)
Posted 10 days ago by Anthony Ayiomamitis
My internet connection problems which dragged on for weeks were finally resolved about ten days ago. However, we have a serious heat wave in progress throughout Europe with local temps in Greece sitting in the high 30's to low 40's C.

As a result, I will be skipping this challenge and wish everyone else here all the best in both challenge points and prime(s) found.
3) Message boards : Aggie The Pew message board (Message 131005)
Posted 10 days ago by Anthony Ayiomamitis
Yes, a very fine couple of pictures. And very hard to do as well as this.

I was surprised to see you used continuous servo mode.

My intervalometer is purposely set to one-second delay between exposures so as to allow generous time for each image to be written to the memory card.



That shows my lack of understanding of terminology. I had assumed continuous servo mode was a reference to autofocus https://www.slrlounge.com/glossary/continuous-servo-af-definition/. I quite understand why you'd have a 1 second delay between exposures.

Continuous servo mode allows the camera to shoot in rapid succession with action sports photography being a very good example. How often do we see a great still shot of a ball about to hit the head of a striker or something similar? This is the continuous servo mode in action where bursts of exposures are fired off in rapid succession with autofocus activated.

I just took a brief look at the video you cite. I do not agree with the (exclusive) association of continuous servo mode with autofocus. Here is an example of my use of continuous servo mode with manual focus: http://www.perseus.gr/Astro-Sat-Trans-2018-08-12.htm ... in fact, I would have been toast with autofocus activated in this situation due to the fraction of a second required to catch the ISS on successive frames and where there would have been no time/opportunity for the camera to focus/refocus during this fraction of a second.
4) Message boards : Aggie The Pew message board (Message 130994)
Posted 11 days ago by Anthony Ayiomamitis
Yes, a very fine couple of pictures. And very hard to do as well as this.

I was surprised to see you used continuous servo mode.

My intervalometer is purposely set to one-second delay between exposures so as to allow generous time for each image to be written to the memory card.
5) Message boards : Aggie The Pew message board (Message 130888)
Posted 15 days ago by Anthony Ayiomamitis
A couple of results from last night following a 2-hr drive southwest of Athens:

(1) http://www.perseus.gr/Astro-Star-Trails-Karyes-Karyatides-2019.htm

(2) http://www.perseus.gr/Astro-Star-Trails-Karyes-Karyatides-2019b.htm

My plans for tomorrow involving 30-meter radio telescopes are out the window due to expected clouds. :-(
6) Message boards : Aggie The Pew message board (Message 130887)
Posted 15 days ago by Anthony Ayiomamitis
Here is tonight's picture https://flic.kr/p/2gpYvT9. See what objects you can spot.

The blob at the bottom is a star called Sadr. It is only a few degrees from the previous picture.

I used the same equipment as in the previous picture but instead of 1 minute exposures I used 4 minute ones. AA asks why I use such short ones. Mainly it is because there is so much light pollution around here that you can't use long ones and also because we are on the flight path of aircraft landing at Heathrow and there are lots of satellites; it reduces the percentage with tracks on them.

Tim,

Thanks for the Butterfly Nebula in Cygnus. This is always a popular target during summer.

As for the short exposures, narrowband filters tend to be a solution for light pollution since they not only permit very tight band passes but also specific wavelengths. For h-alpha, these filters are centered on 658.3 nm (by memory) and generally have a bandpass of 3 to 7 nm, thus being quite effective at excluding light pollution.

As for the planes, I agree that they are a real pain and become an issue with longer exposures. However, we do have pretty good means to (easily) exclude them during processing using something like a median combine or a sigma-reject.
7) Message boards : Aggie The Pew message board (Message 130825)
Posted 19 days ago by Anthony Ayiomamitis
Tim, very nice. I am surprised at the depth using one-minute subs.

Here is my version from a few years ago using 20-min subs: http://www.perseus.gr/Astro-DSO-IC-5070.htm. Click on the image for a higher resolution version of the same.

Due to light pollution, I never got around to pursuing the RGB portion.

Edit: Just to the left of the Pelican Nebula is the North American Nebula which is quite large with respect to its apparent diameter: http://www.perseus.gr/Astro-DSO-NGC-7000.htm. Again, click on the image for a higher resolution version thereof.

Edit 2: The well-known "rift" in the southern portion of the North American Nebula (in colour): http://www.perseus.gr/Astro-DSO-NGC-7000-Rift.htm
8) Message boards : Aggie The Pew message board (Message 130822)
Posted 19 days ago by Anthony Ayiomamitis
Tim, very nice. I am surprised at the depth using one-minute subs.
9) Message boards : Aggie The Pew message board (Message 130591)
Posted 26 days ago by Anthony Ayiomamitis
One lonely mac on autopilot, and:

What a sight those Sapphires. Respect!
10) Message boards : Aggie The Pew message board (Message 130463)
Posted 33 days ago by Anthony Ayiomamitis

Good and steady progress towards minimum Turquoise.


Next 10 posts
[Return to PrimeGrid main page]
DNS Powered by DNSEXIT.COM
Copyright © 2005 - 2019 Rytis Slatkevičius (contact) and PrimeGrid community. Server load 1.03, 1.24, 1.34
Generated 21 Jul 2019 | 7:22:51 UTC