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Forum: Pentax K-5 12-11-2018, 04:48 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
I shot another comet last weekend.... 46P/Wirtanen. This one appears really large (much larger than the moon), even though the actual comet is quite small. I shot this with my Takahashi FSQ106ED scope and my Pentax K5II.
Forum: Pentax News and Rumors 10-07-2018, 01:48 PM  
K3ii replacement
Posted By Eric Seavey
Replies: 2,451
Views: 177,005
Turns out, based on the 46-minute interview with Mr Baus, my guess was correct, the KP is the K3II successor in his opinion....

46 min Interview with Ricoh's Mr. Baus (in German) from Photokina 2018 - PentaxForums.com
Forum: Pentax K-5 09-28-2018, 02:55 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Here another couple shots taken with my modified K-5 camera... Helix Nebula and Comet 21P Giacobini/Zinner in conjunction with Messier 37
Forum: Pentax News and Rumors 09-28-2018, 02:47 PM  
K3ii replacement
Posted By Eric Seavey
Replies: 2,451
Views: 177,005
It appears that the KP perhaps IS the successor....... ? maybe?
Forum: Pentax K-5 06-19-2018, 09:11 AM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
I had the IR-cut filter and anti aliasing filter removed a couple months back, and now have a capable astronomy camera with a bare sensor. I think it was about $250 conversion at spencer's camera, and is now a capable atro-photography camera.

The Eagle Nebula with the Pillars of Creation in the center I shot 90 lights and 30 darks at 45-second exposures and ISO 400 with my Skywatcher Maksutov-Newtonian 190.
The Lagoon/Trifid Nebulas with Webb's Cross in the top right corner I shot 90 lights and 30 darks at 30-sec exposures and ISO 400 with my Takahashi FSQ106ED.
Forum: Mini-Challenges, Games, and Photo Stories 09-14-2017, 04:20 PM  
Contest 2017 Solar Eclipse Challenge!
Posted By Eric Seavey
Replies: 99
Views: 10,353
I know the challenge is closed but thought I'd add my efforts to this thread your everyone to enjoy.
Forum: Pentax K-5 09-03-2017, 11:30 PM  
Is the Pentax K-5 a classic ?
Posted By Eric Seavey
Replies: 49
Views: 5,841
Wasn't the K10D considered a very successful model and therefore a bit of a classic? The K5 was a huge step up from the K7 in terms of sensor performance, and maybe that is what people really liked that made it a little more popular. However, the low light focus issue was really bad. The K10D was solid and worked solidly.
Forum: Pentax K-5 09-03-2017, 12:46 PM  
Rapair/Cleaning or Upgrade to K3ii?
Posted By Eric Seavey
Replies: 2
Views: 1,012
Thanks Adam,
I haven't adjusted the focus fine adjustments in a while. Maybe it can use some tweaking.

Eric
Forum: Pentax K-5 09-01-2017, 11:01 AM  
Rapair/Cleaning or Upgrade to K3ii?
Posted By Eric Seavey
Replies: 2
Views: 1,012
I've had my K5ii for 4 years now, only 37000 actuations. I have been finding lately that the focusing is sometimes a little off, especially if there are a lot of bright red objects in the frame. I requested a quote for repair and it was $262. This camera was a significant upgrade to my K5 in regards to the focusing performance in low light conditions. So I am quite happy with this K5ii, but must admit I was intrigued when the K3ii came out. I have never used my onboard flash, and have an O-GPS1 that I use for wide field astro photography, so seems the K3ii was produced just for me. ;)

I was going to send all my 4 pancake lenses in for them to match and adjust optimum focus, but that is another $109 per lens, which is what they quoted for repair. Is that needed? I keep them clean, and the lenses seem fine, but maybe they need cleaning?

So that is going to run me about $700.

I am wondering if I should upgrade to the K3ii. Or maybe just send in my K5ii only, and hope those repairs fix the problem? I also hate to be without a camera for a month, although I still have my K5.

Anyway, I am bouncing through my thoughts here, and am looking for some input/opinions/thoughts.

Thanks
Forum: Pentax K-5 05-11-2017, 05:03 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Another shot using my K-5 camera. Prime focus on a Skywatcher MN190 telescope. Enjoy!

Cigar Galaxy (Messier 82) and Bode's Galaxy (Messier 81)
Forum: Pentax K-5 11-25-2016, 09:07 PM  
Astro Photography ~ Need Advice and Criticism
Posted By Eric Seavey
Replies: 19
Views: 3,307
That last image looks nice,and the first image seems to have not had a stable tripod. I use a pentax remote shutter that I bought on amazon, so that I do not touch the camera for releasing the shutter. Wind can actually wobble the camera too. I found the Pentax o-gps1 very useful for wide angle astro photography. The stars will be sharp at least, although in the corners there may be some distortion when using wider lenses. I attached my image of the milky way that was a 90 second exposure, 15mm pentax prime lens, ISO 1600. Sorry for the light pollution. Of course the static trees will be blurred due to any breeze and the tracking of the rotation of the earth.
Forum: Pentax K-5 10-01-2016, 11:49 AM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
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: 269,510
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 08-26-2016, 06:48 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
The Pentax K-5 is definitely a great camera for astro photography! Here I shot the Trifid (with M21 in the corner) and the Lagoon Nebula.
Forum: Pentax K-5 04-24-2016, 08:57 AM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Pete/Aaron,
Thanks! All exposures were 30 seconds. However, by stacking them, the noise gets really low, and I am able to extract the faint parts with a very steep S-curve in DDS without blowing out the stars. I used Oloneo to tonemap the 16-bit image and pull out more contrast.
Forum: Pentax K-5 04-23-2016, 07:03 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Great Orion Nebula I shot a couple of months ago. I stacked 60 shots of 30 second exposures at ISO 80. I attached my K-5 at prime focus to a Skywatcher Maksutov-Newtonian 190mm telescope with a mount tracking the rotation of the earth assisted with an autoguider. Used Deep Sky Stacker to add all exposures together, and photoshop and Oloneo for final processing.
Forum: Pentax K-5 10-04-2015, 09:02 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
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 10-04-2015, 06:41 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Sorry to hear about that, you must have been bummed!
Attached is are my shots The first one I used a bigma lens with a Pentax k-5II and GPS-01. The second I used a Pentax K-5 on a 5" telescope with reasonable tracking. The third I composed an HDR photo with the same telescope.

Awesome shots everyone!!
Forum: Pentax K-5 04-07-2015, 10:35 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
I did a test shot of the M42 from my parking lot early this year. I will try again next year in a dark location.
Forum: Pentax Medium Format 03-26-2015, 08:23 AM  
Craving Medium Format
Posted By Eric Seavey
Replies: 12
Views: 1,248
Thanks all for your suggestions. Since I have been thinking of getting a polaroid camera for the effects, that I am having a hard time reproducing digitally, perhaps I could also add a medium format film camera.

Let's see regarding the DOF, the sensor is about 4 times the area than that of the K5 (about twice the size in each dimension. So when shooting f/2.8 45mm with a 645D, the field of view appears more like what you would get with a 23mm on a K5. The DOF is what it is for each focal length and aperture, so if I took a 45mm f/2.8 lens and shot a panoramic photo on a k5, covering the field of view of a 23mm lens, I would have to scale the panoramic shot down by a factor 2 to fit the same print size as what I get in a single 23mm shot, thus also scaling the DOF. So would shooting with a 645D 50mm f/2.8 produce similar images to k5 23mm f/1.4? OK... I am just thinking here. I'll open my books on optics tonight and run some calculations....

What are other differences shooting with a digital medium format? What am I seeing in the photos posted that make the photos somehow seem different than those from aps-c cameras? Dynamic range and resolution are different, those shouldn't make that much visible difference on a resized image right? I attached an HDR photo from my vacation using my K5II, cropped and resized it. Aside from resolution, it is not bad.
Forum: Pentax Medium Format 03-25-2015, 07:02 AM  
Craving Medium Format
Posted By Eric Seavey
Replies: 12
Views: 1,248
I never had interest in purchasing a full frame DSLR, and am very satisfied with my K5II. The low light focusing problem on my K5 angered me so much, though it is fine for manual focusing, so I now use it for astro-photography. I converted a K10D with its CCD sensor for IR and UV photography that works quite well.

As the prices of used medium format DSLRs are now in a reasonable range, I am craving for that super thin DOF. Even my Sigma 30mm f/1.4 on my K5II doesn't quite cut it, there is something different compared to the FOV and DOF of medium format images I see..... Then again, maybe I shouldn't be blowing away so much money..... Let me think some more.

One thing I am very pleased to see is that Pentax has been a game changer in the medium format arena.
Forum: Pentax K-5 01-17-2015, 01:51 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
You take a photo of the subject, and then you move the camera a little such that there are vey few stars in the frame. Then you unfocus the camera and take a photo. In photoshop you take the blurry image and add it as a layer and select difference to reduce the light pollution.
Forum: Pentax K-5 01-17-2015, 12:09 AM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Comet Lovejoy. Taken near Los Angeles. I subtracted the light pollution from the photo to get this shot. Used a Celestron 5i telescope and tracked the comet. The comet was not visible to the naked eye here, so I use the O-GPS-1 and my 40mm prime to spot the comet in relation to other stars and scanned the region with the telescope until I found it.
Forum: Pentax K-5 10-20-2014, 06:53 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
Today the sun had huge sunspots, visible with the naked eye (wearing solar glasses).
Forum: Pentax K-5 10-08-2014, 04:21 PM  
K-5 For Astrophotography
Posted By Eric Seavey
Replies: 1,092
Views: 269,510
I also took some shots with the same camera mounted on my Bigma (50-500mm) @ 7sec exposure 500mm F/8 ISO100 with the O-GPS-1 astrotracker

I cropped the photo and kept the star to the left to show no star trails.
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