Forgot Password
Pentax Camera Forums Home
 

Showing results 1 to 25 of 263 Search:
Forum: Welcomes and Introductions 3 Days Ago  
Hello from the Black Isle in Scotland
Posted By damianc
Replies: 11
Views: 271
Welcome to the forums. I started out with a KR10 many years ago, still have the camera and it still works, though it doesn't get taken out much nowadays.

I think that's at least 3 of us in the Highlands now!
Forum: Pentax K-1 01-30-2019, 07:22 AM  
Automated focus stacking
Posted By damianc
Replies: 24
Views: 2,175
Did you manage to build the GUI sample on OpenSuSE ? I'm getting wx_gtk lib errors
Forum: Welcomes and Introductions 11-23-2018, 04:26 AM  
Greetings from Scotland!
Posted By damianc
Replies: 17
Views: 496
Ardbeg Uiguedail is a heavenly Islay malt worth looking out for. I'll add a vote for Laphroaig, particularly the unfiltered cask
Forum: General Photography 11-22-2018, 01:29 PM  
Black Friday 2018
Posted By damianc
Replies: 14
Views: 1,075
causes so many dilemmas ...
Forum: General Photography 11-22-2018, 01:00 PM  
Black Friday 2018
Posted By damianc
Replies: 14
Views: 1,075
15-30mm at 999 has me tempted (SRS)
Forum: Welcomes and Introductions 11-16-2018, 02:02 AM  
Greetings from Scotland!
Posted By damianc
Replies: 17
Views: 496
Hi Callum and welcome. there's quite a few of us here in Scotland and certainly many on the forum with lots of knowledge
Forum: Pentax K-1 10-17-2018, 12:31 PM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
I didn't. It doesn't look like the usual stuck pixels. I'll give it a test on the off-chance.
Rawtherapee's hot-pixel function in the demosaic section seems to do a good job of removing stuck pixels too
Forum: Pentax K-1 10-16-2018, 07:51 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
I can thoroughly recommend Rawtherapee for RAW processing. It has an incredible number of options, and for me an intuitive layout, though no doubt it may seem different to other tools. Development is very active (I believe it was one of the first tools to offer pixel shift support).
I have tried the impulse noise reduction tool to remove the white dots and it does seem to do a tremendous job, increasing the threshold slider just to the point where almost all dots are removed.
I've not seen the black dots(yet) that Gimbal mentions above: I guess no tool is going to be perfect, but for the money it's definitely worth it - a no brainer on Linux
Forum: Pentax K-1 10-15-2018, 03:02 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
Thank you for that, it saved me the task
The upshot seems to be we have to live with it. Like I stated earlier: Rawtherapee's 'Impulse Noise reduction' does an excellent job of cleaning images up, and coupled with batch processing should make preparation for stacking straightforward. It strikes me that this may be mostly fixable in firmware given how anomolous these pixels are though.

Using Rawtherapee to look at the bayer pattern it looks like (on this image at least) that only green and red pixels are reading high
Forum: Pentax K-1 10-14-2018, 06:00 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
- guilty as accused. Only evidence being no-one on here seems to have mentioned it in relation to the K-1ii

ISTR it's somewhere in the long thread about the white dot issue in relation to the K1. I'll check when I get back
Forum: Pentax K-1 10-14-2018, 04:41 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
It was taken with a k35mm at f4 I think. There was a fair amount of atmospheric haze too: I was experimenting rather than looking for a great shot. I do realise I was rather pushing the limits at 10 mins, but wanted to explore those limits.
I've perhaps not read widely enough on the subject, but understood that Nikon had some sort of fix for the d810, I was assuming Pentax had done similar.
Forum: Pentax K-1 10-14-2018, 02:53 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
I was hoping to avoid LENR because of the additional exposure time, but I understand it is an option for some shots
I process using Rawtherapee, and the impulse noise reduction feature seems to do an excellent job of removing these artifacts. What bothers me is I'm seeing them in the first place. I've not seen similar on the K3 or K30, and thought that perhaps the problem had been fixed on the K-1ii
Forum: Pentax K-1 10-14-2018, 01:59 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
I understand about stacking to average out noise, however these white dots are extreme outliers and I don't think normal noise. From what I recall I also tried in camera multiple exposure averaging when I first got the camera and still saw dots. I'd have to look back to check
Forum: Pentax K-1 10-14-2018, 12:45 AM  
K-1ii white dot issue ?
Posted By damianc
Replies: 18
Views: 1,255
Being this far north and with constantly cloudy skies I've not had much opportunity to get out and do some night time photography, however I did get an opportunity a couple of nights ago. Looking at an image taken at ISO 2500 for 600 seconds I see hundreds/thousands of bright dots. Reading the forums I have only seen K-1 owners mention the white dot issue and wondered whether any other K-1ii owners are seeing similar. I've attached a 100% crop of a minimally processed image as an example. The dots don't always appear to be single pixels and are not all white, but are distinctively different from the expected noise.
Forum: Mini-Challenges, Games, and Photo Stories 09-12-2018, 10:07 AM  
Thematic Scotlands National Flower (From Around The World)
Posted By damianc
Replies: 79
Views: 2,487
One from John o' Groats yesterday
Forum: General Photography 09-08-2018, 05:27 AM  
What is important for a great photo?
Posted By damianc
Replies: 65
Views: 2,251
I'm not sure that anyone has mentioned the reaction/feeling etc in the eyes and mind of the viewer, which I think is essential
I'd also reduce light down from natural/artificial to just light. You don't need natural light to take a great photo
Forum: Pentax SLR Lens Discussion 09-05-2018, 06:22 AM  
Russian Lens Question? - Tair 3
Posted By damianc
Replies: 13
Views: 760
I have to say I've almost always used it on a tripod. Hand held is not easy at all. ISTR reading somewhere that the grease in the helicoids eventually dries up.
Forum: Pentax SLR Lens Discussion 09-04-2018, 04:06 PM  
Russian Lens Question? - Tair 3
Posted By damianc
Replies: 13
Views: 760
I have a 300A with a similar problem. When the tripod mount is tightened up the focusing ring becomes stiff. I believe it's a common problem on this lens, I just haven't got around to trying to strip it down yet.
I'll add that it's a huge heavy thing to deal with.
Forum: Pentax Forums Giveaways 09-02-2018, 06:00 AM  
August Pentax K-1 II Giveaway: Raffle Thread 2, 13:00 UTC, September 2, 2018
Posted By damianc
Replies: 80
Views: 2,434
ooh, this is exciting ...
Forum: Post Your Photos! 08-31-2018, 11:57 AM  
Landscape Morning
Posted By damianc
Replies: 17
Views: 285
Love that hint of mist in the background
Forum: Post Your Photos! 08-31-2018, 05:24 AM  
Abstract Work in progress
Posted By damianc
Replies: 16
Views: 482
For a number of reasons I haven't got around to revisiting this shot but it's a fairly simple setup:

Goats beard seed superglued to a flat baking sheet then filled with water.

A fine mist spray of water (or water/glycerin)
A mix of glycerin/water/blue food colour dropped onto the seed using a fine syringe
Lighting is provided by a single speedlight bounced off white card at the back of the scene.
Ordinarily I'd keep the flash low to get a while reflection off the water, but on this occasion I kept it higher so illuminating less of the surface water.
I'm not sure whether I like the central blue drop or not, and I'd like to play with the lighting a little
Forum: Post Your Photos! 08-31-2018, 05:15 AM  
Streets Penned
Posted By damianc
Replies: 10
Views: 219
Thanks for the positive comments.
I used to shoot mostly B&W in film so it's surprised me how long it's taken to shoot less colour digitally
Forum: Post Your Photos! 08-30-2018, 01:17 PM  
Streets Penned
Posted By damianc
Replies: 10
Views: 219
Another from the lamb sales in Lairg, Scotland. Shot through the wooden fencing of one of the pens
Forum: Pentax DSLR Discussion 08-24-2018, 10:19 AM  
New Pentax DSLR: Evidence at Adorama!
Posted By damianc
Replies: 347
Views: 17,574
KZ922

Adorama have the model number correct, just not the price or description

I believe Pentax are diversifying
Forum: Post Your Photos! 08-24-2018, 01:25 AM  
Landscape Scotland
Posted By damianc
Replies: 13
Views: 319
River Don ?
Search took 0.01 seconds | Showing results 1 to 25 of 263

 
Forum Jump


All times are GMT -7. The time now is 09:21 AM. | 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