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Forum: Post Your Photos! 12-14-2018, 07:32 AM  
Nature Jewels - Nebulas in Orion Constellation with Pentax-M 200/F4 from 1982
Posted By Pete_XL
Replies: 12
Views: 967
Thank you for the flowers :-)


You are right, the K-3ii has the Astrotracer built in. But I use it only for wide field astro images outside. In my experience it provides 10x to 20 x longer exposure times compared to shooting without tracking. This is not enough for longer lenses. For Deep Sky objects and longer lenses I use a guided tracking mount. This image was made with the camera mounted on a Skywatcher AZ-EQ5 mount autoguided with the MGEN guider. Before that I had a Skywatcher Star Adventuer that provided results that might compare to yours from the Vixen Polarie.
Forum: Pentax DSLR Discussion 10-31-2018, 12:23 AM  
Where to get 48mm Pentax T-ring?
Posted By Pete_XL
Replies: 17
Views: 4,030
We had this topic recently in the astrophotograpy group Very short Pentax-K adapter solution - Astrophotography - PentaxForums.com


There seem to be two solutions:





And:
Forum: Post Your Photos! 10-16-2018, 02:16 AM  
Nature Astrotracer and the Alps
Posted By Pete_XL
Replies: 1
Views: 282
Hiking in the Austrian Alps I used the Astrotracer function of the K3ii for an image with the Heart-of-Jesus Chapel and the Milky Way above the Mottakopf mountain in a little village named Brand. The final image consists of 20 x 60 s with the Astrotracer for the stars and 8 x 30 s for the foreground. The stars were stacked with the freeware Sequator (great! program) and the composite was arranged and postprocessed in Photoshop CC2018.


Chapel "Heart of Jesus" in Brand (Austria) under the Milkyway by pete_xl, auf Flickr
Forum: Pentax DSLR Discussion 10-09-2018, 12:15 PM  
Where to get 48mm Pentax T-ring?
Posted By Pete_XL
Replies: 17
Views: 4,030
Thank you for the information. So I would end up with 45.46 + 10.30 = 55.76 mm. Thats not too far away from my goal!!!
Forum: Pentax DSLR Discussion 10-09-2018, 11:24 AM  
Where to get 48mm Pentax T-ring?
Posted By Pete_XL
Replies: 17
Views: 4,030
What is the minimal distance from sensor to flattener you can reach with that adapter combination?:confused:
I need 55 mm distance and I will have my T adapter drilled wider to directly insert a M48 ring there. This is the only chanceI see for my setup to stay near the 10 mm that remain from the camera flange to the flattener.:fedup:
Forum: Post Your Photos! 10-06-2018, 12:23 AM  
Nature The Melotte 15 Complex
Posted By Pete_XL
Replies: 6
Views: 317
Thank you all for you friendly comments.

@GeoJerry: I am glad that my astroimaging setup on the balcony runs stand alone most of the night after I have set it all up properly. So I need maybe an hour for the setup and go to sleep. The software calculations that follow next day do not make much work - they run half- automated and only need a bit of attention. The final processing I do „manual“ in Photoshop need between 2 and maybe 6 hours of work depending on the complexity of the target. So it is not too much work for me in the end.....
Forum: Post Your Photos! 10-06-2018, 12:15 AM  
Nature The Melotte 15 Complex in Hydrogen-Alpha Light
Posted By Pete_XL
Replies: 2
Views: 259
In this case they only differ in color because I took the black&white hydrogen alpha data for 100% of the luminance information. So it delivers all of the details and contrast. The color shot was taken only for the color values and distribution.
Forum: Post Your Photos! 10-05-2018, 12:35 AM  
Nature The Melotte 15 Complex in Hydrogen-Alpha Light
Posted By Pete_XL
Replies: 2
Views: 259
Melotte 15 is a cluster of young stars in the mid of the cloud complex IC1805 - the Heart Nebula - in the constellation Cassiopeia.

This is a so called narrowband image. Galactic cloud complexes that contain hydrogen-alpha gas send out light of a deep red wavelength when they receive strong radiation of nearby stars. The narrowband filter only lets through this wavelength and closes out all other colors and so also the light pollution.

The image was made from 56 images of 600s exposure @ ISO 800 with 12 nm Hydrogen-Alpha narrowband filter. The data were shot through a 130/910mm refractor with a stock Pentax K3ii.

Processing in Astro Pixel Processor and Photoshop CC2018

Melotte 15 in Hydrogen-Alpha Light by pete_xl, auf Flickr
Forum: Post Your Photos! 10-05-2018, 12:26 AM  
Nature The Melotte 15 Complex
Posted By Pete_XL
Replies: 6
Views: 317
Melotte 15 is a cluster of young stars in the mid of the cloud complex IC1805 - the Heart Nebula - in the constellation Cassiopeia.


The image is a combination of 56 x 600s @ ISO 800 with 12 nm Hydrogen Alpha narrowband filter and an RGB image. The Ha data were shot through a 130/910mm refractor with a stock Pentax K3ii. The RGB data were taken with a 80/480 mm refractor and a stock Pentax K5 (48 x 180s @ ISO 800).


Processing in Astro Pixel Processor and Photoshop CC2018



full resolution: Melotte 15 (Ha-RGB) by pete_xl, auf Flickr
Forum: Pentax K-5 09-29-2018, 04:00 AM  
K-5 For Astrophotography
Posted By Pete_XL
Replies: 1,092
Views: 269,209
VERY! nice, Eric! Congratulations!!!
Forum: Post Your Photos! 09-22-2018, 02:46 AM  
Nature The Cygnus Wall
Posted By Pete_XL
Replies: 11
Views: 407
Thank you pichaser and all the others here who gave friendly comments on my images.

It always feels a bit strange to share this special stuff here in the general picture forum. That is why I was a bit chary at this point in the past. But as I get a positive echo I will be continue posting astrophotos here. And maybe it also helps to let our PentaxForums astrophotograpy group grow.

Cheers Pete
Forum: Post Your Photos! 09-18-2018, 11:19 PM  
Nature The Cygnus Wall
Posted By Pete_XL
Replies: 11
Views: 407
Thank you all for your friendly comments!!!!!
Forum: Post Your Photos! 09-17-2018, 12:31 PM  
Nature The Cygnus Wall
Posted By Pete_XL
Replies: 11
Views: 407
The red emission Nebula called Cygnus Wall is the part of the North America Nebula (NGC7000) that resembles Mexico/Central America. The region is characterized by dark nebulas and dust lanes that give the scenery a dramatic attitude.
The image was made with a standard unmodified Pentax K3ii on a TS 130/910 refractor with 0.79x reducer. The blue/ red colors were generated by separating magenta and red in postprocessing and shifting the magenta more and more to light blue. The now blue colors should represent OII emission regions while the red colors come from Hydrogen alpha emissions.
39 x 300 s exposures @ ISO 200.


The Cygnus Wall in NGC7000 by pete_xl, auf Flickr

Astropixelprocessor and Photoshop CC2018


P.S. PENTAX FOR ASTRO!
Forum: Post Your Photos! 09-11-2018, 11:13 AM  
Nature Dark Shark
Posted By Pete_XL
Replies: 4
Views: 279
Thank you all for your kind words and thanks for watching!
Forum: Post Your Photos! 09-10-2018, 12:40 PM  
Nature Dark Shark
Posted By Pete_XL
Replies: 4
Views: 279
The "Dark Shark" nebula is a dust cloud complex in the constellation Cepheus. The two blue patches are the reflection nebulas VdB 149 and 150. I needed 5 hours of light to hook that beast from my homes balcony :-)
LDN1235 The Dark Shark by pete_xl, auf Flickr
Forum: Pentax K-3 09-07-2018, 12:38 AM  
why I won't buy a k3 (Warning: Satire Thread)
Posted By Pete_XL
Replies: 64,453
Views: 2,228,917
No, no, Scotty, thank you for the flowers but all the honour belongs to you this time ;). The processing of this wide field image is excellent!. It shows these fine dark whispy molecular clouds that I know are hard to dig out in a Bortle 4 image with a bit more than 2 hours exposure time. And the stars and colors are also very nice!

And comming to that tutorial question .... I was asked myself today in another thread to maybe do one. I would like to do another tutorial but I had already tried to share some of my ideas and techniques but had to realize that it is hard to do that and that it is questionable if somebody else can profit. Maybe when I have retired :rolleyes:
Forum: Post Your Photos! 09-06-2018, 09:35 PM  
Nature Jewels - Nebulas in Orion Constellation with Pentax-M 200/F4 from 1982
Posted By Pete_XL
Replies: 12
Views: 967
Thank you, Jerry!
Forum: Post Your Photos! 09-06-2018, 09:35 PM  
Nature Jewels - Nebulas in Orion Constellation with Pentax-M 200/F4 from 1982
Posted By Pete_XL
Replies: 12
Views: 967
For long exposures in astrophotography it is necessary to use a so called equatorial mount that carries the camera. Its main axis is orientated parallel to the earth‘s rotation axis and it rotates the camera/telescope with the same speed.
Forum: Post Your Photos! 09-06-2018, 12:39 PM  
Nature Jewels - Nebulas in Orion Constellation with Pentax-M 200/F4 from 1982
Posted By Pete_XL
Replies: 12
Views: 967
I fear a short tutorial won‘t help. Depending on the starting point it may be quite a way to get there. I needed about three years to learn to make astroimages that are worth their name. Maybe 60 nights out in the cold. I allready published some tutorials but I am not sure if it helped anybody. There are already others in the internet that are better than all that I could produce.

I started with old pentax primes, the O-GPS1, astrotracer and a base knowledge in Photoshop. For the processing I searched YouTube for tutorials and step by step upgraded techniques and knowledge with refractor - travelling mount - bigger scope - bigger mount - bigger scope - bigger mount. That is where I am now. I fear that if you want to dive into that thing you will have to start in cold water and begin to swim. It helps a lot to be part if a community like our astrophotography group here or the cloudy nights community. And Youtube has a lot of grat tutorials. Just start - do it. The rest will come from alone if you get addicted.

Cheers
Peter
Forum: Post Your Photos! 09-04-2018, 07:24 AM  
Nature The Cocoon Nebula shot with a stock K3ii
Posted By Pete_XL
Replies: 5
Views: 325
Thank you for your friendly and encouraging compliments, guys! This helps me staying out in the cold next time :D
Forum: Post Your Photos! 09-03-2018, 07:45 AM  
Nature The Cocoon Nebula shot with a stock K3ii
Posted By Pete_XL
Replies: 5
Views: 325
The Cocoon Nebula is embedded in dark dust clouds floating in a sea of stars in the constellaion Cygnus. The nebula is shining red because it contains hydrogen gas that is ionized by the radiation of nearby stars. The nebula is about 3000 lightyears away.

Cocoon Nebula by pete_xl, auf Flickr

The image was made from 77 x 180 s ISO 1600 subs with my K3ii that is attached to a 910 mm telescope.
Forum: Pentax DSLR Discussion 09-02-2018, 01:09 PM  
Where to get 48mm Pentax T-ring?
Posted By Pete_XL
Replies: 17
Views: 4,030
I also urgently need a Pentax K bajonet with a female 48mm (2“) thread on the tel scope side to connect my flattener-reducer (male thread 48mm) with the camera and hold in the short distance of 55 mm between the reducer and the sensor.

Is it possible that this connection does not exist anywhere on earth?
Forum: Post Your Photos! 09-01-2018, 01:15 AM  
Night Horsehead and Flame - not only Canon can......
Posted By Pete_XL
Replies: 28
Views: 1,834
Thank you, Kevin! I have my fingers crossed..
Forum: Post Your Photos! 09-01-2018, 01:14 AM  
Night Horsehead and Flame - not only Canon can......
Posted By Pete_XL
Replies: 28
Views: 1,834
Thanks!
Forum: Post Your Photos! 09-01-2018, 01:13 AM  
Nature The 2018 Perseid meteor shower - Milky Way version
Posted By Pete_XL
Replies: 3
Views: 232
I had the intervallometer set to 10s exposures. The building was lit outside by a streetlamp and inside it was dark. To have light in the building I went from room to room and switched on the lamps for a short time.
For the final image I stacked 10 images aligned on the foreground and if I remember well about 50 images aligned on the stars with the software Astro Pixel Processor.
Then foreground and stars were composed to one image in Photoshop.
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