Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-17-2013, 11:18 AM   #571
Veteran Member
Dr_who's Avatar

Join Date: Jun 2009
Location: Edmonton, Alberta, Canada
Photos: Gallery | Albums
Posts: 686
QuoteOriginally posted by oneeyedhawk Quote
Finally caught Comet Pan-Starrs through the clouds setting over the Mummy Range
Taken with K-5 and smc 200mm F4 lens
Hank
Very nice, I've been hoping for a break in the snowing and overcast weather here to no avail.

03-17-2013, 03:50 PM   #572
Site Supporter
Ex Finn.'s Avatar

Join Date: Nov 2007
Location: Southern Maryland.
Photos: Gallery | Albums
Posts: 6,148
QuoteOriginally posted by oneeyedhawk Quote
Finally caught Comet Pan-Starrs through the clouds setting over the Mummy Range
Taken with K-5 and smc 200mm F4 lens
Hank
Nice capture and nice and crispy air behind the clouds (jealous).

Last edited by Ex Finn.; 03-17-2013 at 03:57 PM.
03-18-2013, 03:50 PM   #573
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
Nothing very special here. I am just celebrating that I finally had an almost clear sky throughout the night (between 15 and 16 March) - the first reasonably clear sky for ages.

Anyway, whenever I see the cresent Moon, I marvel how fabullously well the human eye can cope with high dynamic range situations. In a small scope, my eyes can easily capure 1 and 2 below together. With my camera, I have to take either one or the other:


1.: 1/20 sec; ISO 400; f/10; FL=900mm; 10 images stacked in Registax 5.1. Click to see larger version.


2.: 10 sec; ISO 400; f/10; FL=900mm; 10 images stacked in Registax 5.1. Click to see larger version.


3: 100% non-resized crop of image no. 1 above.

And finally: Jupiter will soon be lost in the glare of the evening Sun, but I managed to get a reasonable (with my means - everything is relative) shot of it this night:


4: 1/3 sec; ISO 400; f/50; EFL = 4500mm; stack of 17 images in Registax 5.1.
100% non-resized crop.

Images were taken with Pentax K-5 and a Bresser Messier AR90 900mm f/10 achromatic refractor. A 2.5X Apochromatic Barlow lens stacked with a Tamron SP F-Series 2X teleconverter were used for image no. 4.
03-19-2013, 01:43 PM   #574
Site Supporter
smigol's Avatar

Join Date: Sep 2008
Location: Menlo Park, CA
Photos: Albums
Posts: 394
Siamese Twins Galaxies

Here are NGC 4567 and NGC 4568, an interacting pair of galaxies at about 60 million ly. They are both at about 11-12th magnitiude, pretty faint for my scope.

Taken with a 127mm Maksutov Cassegrain with my modified Pentax K10D camera. 23 subs of 1200 seconds at 100 ISO for a total of 7 hours of integration. Calibrated with Maxim with flats, bias, and clipped darks. I haven't had the chance to make a library of non-clipped darks yet. Processed in PI to stretch the histogram and run de-noising. There were some odd ringing artifacts that were introduced from the flats.




Big on flickr
Full size at Astrobin.

03-19-2013, 02:35 PM   #575
Veteran Member
VisualDarkness's Avatar

Join Date: Nov 2011
Location: Uppsala, Sweden
Photos: Gallery
Posts: 4,440
I finally hit the jackpot with the, extremely uncommon at this high intensity this south in Sweden, Aurora Borealis two days ago. It ws so amazing to see the sky glow, even with all the street lights around us.
My Sigma 20/1.8 was really good for this.



03-20-2013, 12:36 PM   #576
Pentaxian
Sagitta's Avatar

Join Date: Feb 2011
Location: Maine
Photos: Gallery
Posts: 2,923
Niiice. I missed the show, somehow - I would of been out if I'd known. I was lucky in that my only (so far) aurora happened in August. I didn't even need to wear a jacket!
03-22-2013, 10:34 AM   #577
Senior Member
GWARmachine's Avatar

Join Date: Sep 2011
Location: Pittsburgh, PA
Photos: Albums
Posts: 137
Here is my photo of comet PanSTARRS. Zenitsuboyama, Yamaguchi Japan.

03-22-2013, 03:04 PM   #578
Site Supporter




Join Date: Dec 2011
Photos: Gallery
Posts: 72
pan starrs k5 and old spiralite lens

Enjoy using old lens on new cameras. This is using an old spiralite f 6.3 fl 400mm lens iso 1600 at 3 sec. on my K5. Lens only cost $50 dollars at Goodwill.. Taken last night from Loveland Co A little motion blur due to 3 second exposure on a stationary tripod. Still shows the tail fan.
Hank

Attached Images
 
03-22-2013, 10:23 PM - 1 Like   #579
Pentaxian




Join Date: Mar 2010
Location: SW Washington
Posts: 814
I don't really know much about image stacking, but I think it's very impressive what you can do with just a single RAW file and some work in Lightroom (mostly to try to reduce the prominence of the lens flare, and boost the contrast, both due to the very bright quarter moon). Taken in Mount Rainier National Park.

K-5, Sigma 10-20mm f/4-5.6 @ 10mm f/4, ISO 1600, 30s:




K-5, Tamron 17-50mm f/2.8 @ 17mm f/2.8, ISO 1600, 15s:

03-25-2013, 05:59 AM   #580
Forum Member




Join Date: Feb 2010
Location: West Chester PA
Posts: 51
Here is a stratrail shot from the other night. This was taken from my back deck with my Kx and my Rokinon 8mm fish eye.
03-31-2013, 11:04 PM - 1 Like   #581
Site Supporter
smigol's Avatar

Join Date: Sep 2008
Location: Menlo Park, CA
Photos: Albums
Posts: 394
Thor's Helmet and Seagull Nebula Widefield

I haven't done a widefield shot in a long while and I went after this combined target last month.

Used a Pentax SMC TAKUMAR/6x7 1:4/200mm lens with adapter to fit the Pentax K10D camera. IDAS LPS P2 filter on the lens with a Baader Ha filter inside the adapter. I'd tried using just the LPS filter on the lens, but too much unfocused IR was ruining the image, leading to myriad red and orange rings around the stars. I used the second filter to limit the passed wavelength to just the Ha region, allowing tighter focus of the nebula and stars.

This is from a stack of six-1200 second subframes stacked using Pix Insight. I had to extract the red channel and reduce the size of the image by 50% to remove bayer artifacts.




In the end, I'm pleased with how it turned out. I learned a lot about how these lenses focus light and what wavelengths manage to get through the filters.
04-03-2013, 12:07 AM   #582
Senior Member




Join Date: Dec 2012
Location: Adelaide, SA
Posts: 145
Hi everyone,
There are amazing pictures in this post.
I really want to now give astrophotography a try. But on a budget.

There's a penumbral lunar eclipse over Adelaide on the 26th April, so I really want to take a couple shots of the moon.

Would my current 18-135 do the job, or should I buy a longer lens?

Should the Sigma APO 70-300mm make a decent astrophotography lens?
04-03-2013, 12:52 AM   #583
Veteran Member
pixelsaurus's Avatar

Join Date: Jul 2007
Location: Levin, NZ
Photos: Gallery | Albums
Posts: 784
QuoteOriginally posted by cpho Quote
Hi everyone,
There are amazing pictures in this post.
I really want to now give astrophotography a try. But on a budget.

There's a penumbral lunar eclipse over Adelaide on the 26th April, so I really want to take a couple shots of the moon.

Would my current 18-135 do the job, or should I buy a longer lens?

Should the Sigma APO 70-300mm make a decent astrophotography lens?
A quick and dirty rule for shooting the moon is to divide the focal length by 100. That will be the approximate size of the full moon in mm at the focal plane. Don't expect too much with a penumbral lunar eclipse; there is not usually any noticeable darkening of the lunar surface. Umbral eclipses are the ones that are easily discernible.
04-03-2013, 03:54 AM   #584
Site Supporter
Stone G.'s Avatar

Join Date: Jun 2010
Location: North Zealand, Denmark
Photos: Gallery | Albums
Posts: 1,516
Wide field photography with a 200mm lens (and Astrotracer)

QuoteOriginally posted by smigol Quote
Gull to Thor Widefield by S Migol, on Flickr
Congratulations to smigol - your skills to squeeze out the weakest photons from the sky is amazing!

I don't have those skills but I do have my trusty, vintage Tamron Adaptall-2 200mm f/3.5 lens (Model 04B) and I do enjoy using it together with my Pentax O-GPS1/Astrotracer unit. Here's a recent example from last Sunday when my skies finally cleared and the Moon was waning:



Star Alkaid (Eta UMa) and the Whirlpool Galaxy (M51). Uncropped stack in intersection mode in DSS of 10 images of 30 seconds
at ISO 3200. The original is 4600 pixels wide. Click on image to see a 1280 pixel wide version.

Of course, it is childish and utterly unscientific to produce a 3-400% enlargement of M51, but for me, astrophotograhy is also just a
question of having fun:


Approx. 300% crop of the above.

And now, I have the DA* 200mm f/2.8 underway in the post. I am excited to see, what that lens may produce........



Actual, 100% crop.
04-03-2013, 05:05 AM   #585
Veteran Member
gbeaton's Avatar

Join Date: Apr 2012
Location: Montreal
Photos: Gallery
Posts: 334
What?! The GPS will track stars?! How does it do that? With the moveable sensor mount? I think I wasted $300 on a Vixen Polarie :-( I read the GPS can track for 5 mins. I seem to be only able to track for 2 mins with the polarie - with the basic setup.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
astronomy, astrophotgraphy, astrophotograhy, bill, camera, dslr, dss, exposures, f/1.8, images, lens, light, lights, lp, moon, night, night sky, photography, pk tether, post, settings, sigma, skies, stars, starscape, street, thanks
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
astrophotography with K-7 - issues =(. Please help? Nass Photographic Technique 40 02-10-2010 10:28 PM
Astrophotography with K10 J-Rod Photographic Technique 5 12-12-2009 06:08 PM
Astrophotography mithrandir Photographic Technique 1 11-26-2009 06:56 PM
K7 And Astrophotography Christopher M.W.T Pentax DSLR Discussion 49 11-25-2009 08:51 AM
Astrophotography elLuiggi Post Your Photos! 0 11-01-2007 05:43 PM



All times are GMT -7. The time now is 08:37 PM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top