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Forum: Pentax Full Frame 03-27-2019, 01:50 AM  
Is this night photography coloured dot distortion from my sensor?
Posted By stevebarnes
Replies: 16
Views: 2,012
Wow guys! What a lot of input. Thank you. Here's a bit of clarity:

A. I wasn't using long exposure noise reduction. Does it affect RAW files? If so, I must reconsider.

B. I've heard of using a dark frame subtraction. I'll have to look up how to do this on my K-1. Any references appreciated.

C. I used two lenses in this shoot. I believe I started with my Samyang flat 14mm f/2.8. It's this lens that the camera always thinks is 15mm. I should post another topic about this to see what people have to say. (advice, opinions?)

D. The other lens is my (made for K-1) Pentax D-FA 24-70 f/2.8. I must confess I thought the image from the prime lens was much superior. I use the 24-70 a lot for dog photography ( and for portraits. It is wonderful on auto-focus compared to my other lenses, and produces a consistently nice image.

E. I'm a Ubuntu Linux devotee (please don't run away). After an injury that left me unable to work and took my house, I learned to week with open-source software. I use Darktable and GIMP. I also have RAW Therapee, but it's very technical, and I'm still learning it when I have time (yes, and a million other things too).
Whilst Darktable is quite amazing, offering drawn masks, parametric masks and other goodies Lightroom doesn't, I still haven't got Chromatic Aberration working properly! I need to get some expert advice I think.

I must download the images stevebrot produced! Thank you so much Steve.

Lastly, as a small VICTIMS fur my K-1 photography, I've been asked today to be a featured photographer at the Ballast International Foto Biennalli here in Australia. I'll be doing two (weekend) days during the 6 week festival of dog photography! It's a paid gig (only a few hundred each time at my own determination), but the amazing thing is the exposure. We have international exhibitors here, and people come from overseas and all round Australia to this amazing festival. I'll have my 4.5x3m black gazebo set up as a studio and my Pentax equipment will be proudly on show. I'll be advertised, and the organisers will take bookings for 15 minute time spots. My dog photography site is The Biennalli site is BALLARAT INTERNATIONAL FOTO BIENNALE |.
Forum: Pentax Full Frame 03-03-2019, 05:02 PM  
Is this night photography coloured dot distortion from my sensor?
Posted By stevebarnes
Replies: 16
Views: 2,012
Hi all,

I had my first go at night photography at Halls Gap, Victoria, Australia on the weekend. Pentax K-1 Mk1 with Pentax 24-70 f/2.8 as released for K-1. I had the camera & lens callibrated in Melbourne tech lab of distributor; it made a big difference.

I'm not sure what the small blue and red dots are on my RAW file. Has anyone experienced similar? How did you deal with it? The file is in my Google Drive due to upload limitations here:

K1SD7509.DNG - Google Drive

Regards from Australia.
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