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Forum: Pentax K-5 11-07-2016, 11:02 PM  
K-5 For Astrophotography
Posted By SKYGZR
Replies: 1,092
Views: 269,508
Posted also in the Astrophotography Group.

Took this w/ the K5ii on 9-2-16 @ 22:35 local. Used the Pentax DA/FE 10-17 3.5-4.5 lens @ f/4.5 set @ 10mm (lower foreground cropped). 120s, 3200iso. Used an I-Optron tracker. White Lighted foreground while exposing....

Forum: Pentax K-5 10-08-2016, 01:46 AM  
K-5 For Astrophotography
Posted By Pete_XL
Replies: 1,092
Views: 269,508
...but depending on the lens or telescope used and the target one may give it a try.....


Mond am 19.Feb. 2016 by pete_xl, auf Flickr

This for example is a panorama of six Ýmages stacks from 1-minute-film-seqences taken with an Olympus OM-D E M5, a Pentax-A 5.6/400 , the pentax 1.4x and 2x TCs with the camera in HD digizoom mode. The final Image is 4549 x 2508 size. It was an easy job and at least a lot of fun :)

6 Clips from tripod -> Import to Magix VideoDeluxe -> export as JPGs -> drag each sequence into Autostackert (free) -> combined to panorama with Microsoft ICE (free) -> PP with Lightroom CC


If Pentax (like other Brands) would deliver a "lossless HD-crop" for the movie mode that would serve as a lossless digizoom that would be great (also for other video applications).

---------- Post added 10-08-16 at 10:58 ----------




I started a new approach on the "Heart nebula with K-5" because I disliked the scruffy stars in the first one. I used a star mask and frequency separation to process stars and background separately.


IC 1805, IC 1795 und NGC 896 - Řberarbeitet by pete_xl, auf Flickr

Data: 45x180s, ISO 800, 80/480 mm, Pentax K-5
Forum: Pentax K-5 10-03-2016, 04:08 AM  
K-5 For Astrophotography
Posted By k5astro
Replies: 1,092
Views: 269,508
Of course! DeepSkyStacker is used by most people it seems. Works great and is easy to use. But you need to output DNG raw files, not PEF files.
Forum: Pentax K-5 10-02-2016, 03:48 AM  
K-5 For Astrophotography
Posted By k5astro
Replies: 1,092
Views: 269,508
A lot of people confuse the focal length issue. The sensor size of the camera does not change the focal length of the lens or its properties! The crop factor (1.5) is the sensors size relative to a 35 mm sensor - the old film standard. It simply means that your image is a smaller portion of the field of a 35 mm sensor - 1/1.5 x smaller.

So the focal length settings are whatever the lens is - no crop factor to account for.

(The confusion arises because often people are comparing the equivalent fields of view. In this case you need a wider lens (shorter focal length) on a cropped sensor to get the same field of view.)

By the way, the K5 and K3 work great with the GPS unit (or built in on the K3 I think) which will help you camera track the stars, but more than 300mm may be too much. Worth looking into!
Forum: Pentax K-5 10-01-2016, 11:49 AM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,508
XLXW,
Schmidt Cassagrains are not great for deep sky astrophotography. You can do it but there are certain things that will help make it work well. First, the mirror is not fixed, so for long exposures your image can drift, and cause star trails. Second you are working with F/10, and that is pretty slow, and many of the SC don't have a good flat field that causes the stars to warp near the edge of the frame. Also, you need an equatorial mount to track earth's rotation for at least an hour. the For long exposures with a SC telescope you need an off-axis autoguider to account for the mirror moving while tracking the sky. The Ring Nebula is pretty bright and so is the moon. You wouldn't have to go very far to image the ring nebula. The moon is very bright, and only needs a short exposure. The ring nebula on and f/10 needs at least 30second exposure. The Iris nebula is quite faint and even with my f/5.3 I took 66 images of one minute at ISO800 (would have liked to get over a hundred). The Dumbbel Nebula and most globular star clusters are also pretty bright, so again, you can get away with 30 second exposures. But you will need to stack at least 40 of them to pull out the details. I use a free program that I downloaded called Stellarium to plan what I want to photograph.

Hope this helps.

Eric
Forum: Pentax K-5 09-29-2016, 04:52 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,508
Pete,
I now have an Skywatcher Maksutov Newtonian MN190 telescope that I mount on a Orion Atlas Pro AZ/EQ-G mount with the "Orion Awesome Autoguider" Package. To focus precisely I have a Bahtinov mask. The mount can control the camera so I just set it up to track at a specific object and take 40 shots or so and stack them in Deep Sky Stacker and do further editing in Photoshop. This telescope has an amazing flat field and is my dedicated deep sky astrograph.

Here is a shot of the Iris Nebula.

Enjoy!
Forum: Pentax K-5 09-24-2016, 10:14 AM  
K-5 For Astrophotography
Posted By Pete_XL
Replies: 1,092
Views: 269,508
I did my astrothings with my new K3 II in the passed year. Yesterday I put on the good old K5 once more to go for a dim nebula from my suburban light polluted balkony.

I did not do any comparison between K3 II and K5 until now but anyway the K5 is a great tool for faint DSOs I think.

This is the Heart Nebula (IC 1805) with its companions IC 1795 and NGC 896. 45 shots of 3 minutes exposure at ISO 800, F6.0 with a TS 480 mm telescope. Hope you like it....

IC 1805, IC 1795 und NGC 896 by pete_xl, auf Flickr
Forum: Pentax K-5 09-08-2016, 04:45 AM  
K-5 For Astrophotography
Posted By k5astro
Replies: 1,092
Views: 269,508
You guys have inspired me to buy the O-GPS1. I'm still waiting for it but when I was looking for a longer lens, I stumbled on Celestron Nexstars for sale. I couldn't resist. Now I'm the proud owner of Nexstar 5se :-)

Now if it would just stop raining! :-P
Forum: Pentax K-5 08-31-2016, 03:25 PM  
K-5 For Astrophotography
Posted By k5astro
Replies: 1,092
Views: 269,508
Amazing group of shots. Inspiring!
Forum: Pentax K-5 10-13-2015, 01:53 PM  
K-5 For Astrophotography
Posted By fs999
Replies: 1,092
Views: 269,508
PENTAX K-5 II s • 80 ISO • Sigma 150-500mm f:5-6.3 APO DG HSM • Pentax O-GPS1 GPS Unit

15" exposure at 04:26:35 GMT+2

Forum: Pentax K-5 10-12-2015, 04:54 AM  
K-5 For Astrophotography
Posted By gazonk
Replies: 1,092
Views: 269,508
I was on holiday and didn't bring a tripod, so I only had the 55-300 and a window as support:


Blood Moon by Espen Vestre, on Flickr

I'm actually happier with the shot I took with my DA35 Ltd macro:


Blood Moon Over Speyer by Espen Vestre, on Flickr
Forum: Pentax K-5 10-04-2015, 09:02 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,508
Here is another shot using my Pentax K-5 and the Bigma,with the O_GPS1. The tracking is important here...
Forum: Pentax K-5 10-01-2015, 04:37 PM  
K-5 For Astrophotography
Posted By y0chang
Replies: 1,092
Views: 269,508
My composite of the eclipse. Unfortunately clouds came in when we hit totality. k5 + sigma 170-500mm at around 450mm
Forum: Pentax K-5 10-01-2015, 01:25 PM  
K-5 For Astrophotography
Posted By Pete_XL
Replies: 1,092
Views: 269,508
You find some in the Astrophotograph Group :)
in the discussion "Totality!".
this is mine............
Forum: Pentax K-5 10-01-2015, 12:12 PM  
K-5 For Astrophotography
Posted By bofh
Replies: 1,092
Views: 269,508
No one did a shoot of the moon during the eclipse? :confused:

So I took this one:


E.
Forum: Pentax K-5 09-18-2015, 06:46 AM  
K-5 For Astrophotography
Posted By DeadJohn
Replies: 1,092
Views: 269,508
Yes, I have, but only for planets and the moon. Eyepiece projection generally increases magnification, and increased magnification = less light = exceptionally long exposure times for dim deep sky objects.
Forum: Pentax K-5 09-17-2015, 10:55 AM  
K-5 For Astrophotography
Posted By seti_v2
Replies: 1,092
Views: 269,508
Thanks guys! I really appreciate it!
Forum: Pentax K-5 09-17-2015, 10:05 AM  
K-5 For Astrophotography
Posted By JimmyDranox
Replies: 1,092
Views: 269,508
Your set up is doing very well. I could say surprisingly well.
Forum: Pentax K-5 06-27-2015, 12:50 PM  
K-5 For Astrophotography
Posted By stanzhou
Replies: 1,092
Views: 269,508
K5 + samyang 14 2.8 + o-gps
milky way above two medicine in glacier national park

Milky Way Shining Above Two Medicine by Chengyu Zhou, on Flickr
Forum: Pentax K-5 06-25-2015, 07:52 PM  
K-5 For Astrophotography
Posted By wigley891
Replies: 1,092
Views: 269,508
This is a bit closer in shot than most of the milkyway shots here.

This was done with a K5IIs and a DA 55-300 set at 55mm. I ran the K5IIs from my laptop with PK_Tether in bulb mode. The K5IIs was piggybacked over an 80mm F7.0 refractor and used a Meade DSI pro and PDH2 to autoguide the LXD55 mount with that refractor. It is centered roughly between M20 and M17

I had waited for the 1st quarter Moon to set to have darker sky and didn't start this image run until 3am. Well mistakes happen when one gets tired. I messed up and shot this at F4.0 instead of F8.0 like I had meant to, so the star shapes suffered in the corners and edges of the frame but that doesn't show too bad at this size.

I was disappointed some since I had planed on printing out a large print but I won't with stars being distorted like that. I may go back and shoot this again at F8.0 and even possibly a longer total run. I was happy with the overall detail and colors (M8, M16, M17, M20, and M22 all show well).

This is 38 x 2 minute frames @1600 ISO processed in PixInsight for a 1 hour 16 minute total exposure time.
Forum: Pentax K-5 06-21-2015, 07:39 PM  
K-5 For Astrophotography
Posted By SirTomster
Replies: 1,092
Views: 269,508
I went out to get some practice with the O-GPS1. The location wasn't the most scenic but it was dark. I did some simple edits in PS but those pesky clouds! Arg!
Forum: Pentax K-5 06-16-2015, 08:07 PM  
K-5 For Astrophotography
Posted By mikeSF
Replies: 1,092
Views: 269,508
here's one from early this morning in Knights Ferry, CA

Covered Bridge & Milky Way
K5 & Sigma 10-20
Forum: Pentax K-5 06-10-2015, 08:30 AM  
K-5 For Astrophotography
Posted By fs999
Replies: 1,092
Views: 269,508
A dark place in south of France to test my Sigma Art 18-35mm F1.8



PENTAX K-5 II s • 80 ISO • Sigma Art 18-35mm F1.8 DC HSM
Pentax O-GPS1 GPS Unit
Long exposure: 299,87 sec
Forum: Pentax K-5 06-08-2015, 06:19 PM  
K-5 For Astrophotography
Posted By interested_observer
Replies: 1,092
Views: 269,508
I have not upgraded yet, but have read about it. The LR6 thread here on the forum was lukewarm about the update. Also, I need a new printer, so was sort of waiting for another package deal....


Actually it's the same rockpile from slightly different perspectives. The rockpile is called Superstition Mountain, and it's located about a hour east of downtown Phoenix (which is off to the right of both images).The second image was taken about a mile behind and two miles to the left of the photographer (the idiot behind the camera) of the first image. The best view - the first image is from the picnic area of the Lost Dutchman State Park. The Dutchman about a 100 years ago came into town with a load of very rich gold ore from his mine up on the mountain, then died. Folks have been searching for it since - which is now illegal, because the US Forest Service is tired of going out and rescuing folks off the mountain, who have been out searching for it.

Anyway, this was a test on stitching the MW, plus I wanted to try out my new lens and needed some new raw shots to try out some ideas.

:cool:
Forum: Pentax K-5 05-20-2015, 02:12 PM  
K-5 For Astrophotography
Posted By mikeSF
Replies: 1,092
Views: 269,508
last night:

Stone House
K5 & DA15 w O-GPS1
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