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Forum: Pentax K-3 05-14-2019, 08:30 AM  
K-3 II extreme motion blur
Posted By Roquefort
Replies: 20
Views: 1,134
Thanks for the replies. I sent it away for repair, we'll see what comes up.
Forum: Pentax K-3 05-07-2019, 03:37 AM  
K-3 II extreme motion blur
Posted By Roquefort
Replies: 20
Views: 1,134
I was using the HD Pentax DA 16-85mm f3.5-5.6. It's quite possible some dirt got on the mount so this might explain it, but in the EXIF of the photos where the problem occurs I don't see any unusual focal lengths. They are all within the range of the lens and plausible for the shot. How did you find out the camera was adjusting for 1600mm, did it show up in the EXIF?

EDIT: I just tested with a 35mm manual lens, setting the focal length to 2000mm. The result is very similar to the problem I've been having, so I think you might be onto something.
Forum: Pentax K-3 05-06-2019, 10:05 AM  
K-3 II extreme motion blur
Posted By Roquefort
Replies: 20
Views: 1,134
All photos were taken hand-held and with SR on. I very rarely use live view and am pretty sure I didn't use it in this example.






Honestly can't say for sure, but I have a few dozen shots where this happened and several of them are of buildings etc where I would have had no reason to be too hasty. I tend to be quite slow anyway :)


I might add I had the K-3 before this and don't think I ever encountered this problem.
Forum: Pentax K-3 05-06-2019, 01:38 AM  
K-3 II extreme motion blur
Posted By Roquefort
Replies: 20
Views: 1,134
Hi Adam, thanks for your reply.


I was using the 16-85mm, never had problems with this combination before.

The problem has occurred in shots with varying focal lengths, exposure times and apertures. None of them should realistically have had any noticeable motion blur (no extreme tele shots, no long exposure times, etc.). In fact all of the shots affected by this could easily have been shot hand-held without shake reduction, without causing motion blur.

Inadvertent pixel-shift or multiple exposure seems highly unlikely. I've taken thousands of shots with this camera with no problems, and now suddenly a fairly high percentage of shots is ruined by this blur. Also, usually taking the same shot immediately after, with exactly the same settings, solved the problem.
Forum: Pentax K-3 05-06-2019, 12:58 AM  
K-3 II extreme motion blur
Posted By Roquefort
Replies: 20
Views: 1,134
Hi,

I've been having problems recently with heavy motion blur appearing in shots where there really shouldn't be any. See the example below (full size: motion blur | Pieter Wouters | Flickr), taken at a reasonable focal length and shutter speed, but everything's blurry and if you zoom in on the man you can clearly see motion blur as if the camera was shaking up and down violently. The problem has been hard to reproduce since it seems to happen randomly, and often taking the same shot immediately after gives a satisfactory result. It only started quite recently but since then has occured in quite a few shots.

I've looked around a bit and some people seem to be experiencing the same problem, but I haven't found any conclusive answers as to why this is happening, or any solutions. My guess is that the shake reduction setting causes the sensor to move around far more than it should. I tried taking some shots with SR off and the problem was gone (but as I said, it appears randomly so this might have been a coincidence).

Has anyone had the same problem and found a solution for it?

Thanks for any information.
Forum: Mini-Challenges, Games, and Photo Stories 09-18-2018, 01:11 PM  
Post-Processing PP Challenge #270
Posted By Roquefort
Replies: 27
Views: 1,440
I went with a slightly tacky swirly effect.

Forum: Photo Critique 09-10-2018, 02:35 AM  
Night Gig with available light
Posted By Roquefort
Replies: 9
Views: 826
Thanks, I'll look into it!
Forum: Photo Critique 09-07-2018, 02:08 AM  
Night Gig with available light
Posted By Roquefort
Replies: 9
Views: 826
Thanks, some useful tips here! I have some experience shooting concerts (albeit with better lighting) and usually tend to get in closer, but here I was mostly concerned with working out the best settings for shooting in very low light so didn't pay as much attention to composition.



Could you elaborate on the multiple color passes you mentioned? I haven't heard of it and googling mostly brings up results about 3d rendering, so I'm not sure what to look for.


I never used to sharpen so am still figuring out the best way to go about it, but have found that sharpening the end result (jpg) a little with a high enough threshold (in GIMP) seems to work well enough without aggravating the noise. When I try to sharpen in the RAW development stage however it's much harder to keep the noise down; maybe this is down to the way Rawtherapee works.
Forum: Photo Critique 09-05-2018, 01:33 PM  
Night Gig with available light
Posted By Roquefort
Replies: 9
Views: 826
Hey,

I'm working on my post processing skills, and trying to shoot some gigs (in small venues, sometimes in very dark bars). The fastest lens I have at the moment is a 50mm 1.8, which will have to do for now. I don't want to use a flash since I really don't like the look (I think they tend to ruin the atmosphere of the shot) and don't want to disturb the musicians.


So, I need to find the best way to shoot and process some very dark shots without destroying them with noise etc. I do like them rather dark and they don't have to be very clean, but ofcourse there are limits. Here's an example, how do you think it turned out? Is it too dark/contrasty/noisy etc? Should I have used a slightly longer exposure time (some minor motion blur in hands etc might be acceptable)?


Forum: Digital Processing, Software, and Printing 08-29-2018, 03:46 PM  
The Squirrel Mafia's RawTherapee thread. Now with 50% more excellence & win!
Posted By Roquefort
Replies: 574
Views: 67,299
Can I still find the dcp profiles mentioned in the first post somewhere? They don't seem to be among the thread attachments.
Forum: Digital Processing, Software, and Printing 08-29-2018, 01:30 PM  
Rawtherapee ICC profile for K-3II?
Posted By Roquefort
Replies: 1
Views: 367
Hi,

Does anyone know if there is a profile available for the K-3II in Rawtherapee (and where to find it)? The K-3 has one but it seems I can't simply use that one, the results seem off.


Thanks!
Forum: Photo Critique 08-15-2018, 05:53 AM  
Streets Tunnel
Posted By Roquefort
Replies: 1
Views: 227
Experimenting with a more panoramic aspect ratio.

Also, a general question: if you're working on a collection of photos, be it for a book or website or Instagram or whatever, would you crop your photos to the aspect ratio that works best for each one individually or do you prefer a uniform ratio for coherence? I tend to stick to the standard 3:2 to keep the collection coherent but in some cases, such as this one, it would go at the expense of a better individual shot.
Forum: Pentax K-3 08-09-2018, 02:41 AM  
K-3II overexposing (after firmware update)
Posted By Roquefort
Replies: 16
Views: 1,181
That example was shot with manual exposure so isn't a useful comparison. And the partly blown clouds were mostly caused by increasing contrast in post-processing, in the RAW there is some, but little, clipping.


I tried the highlight correction setting but I think it only applies on jpg (not sure). I don't see any difference but I know I always had it disabled on the K-3.


The point is that, in similar situations with high contrast, the K-3 seemed to err on the safe side and expose for the light areas, underexposing the dark parts - which I feel is preferable. This is clear in the example I posted. The K-3II seems to go the other way, which is strange to me because I assumed it's basically the same camera apart from a few minor features. I admit it's hard to be sure without being able to compare them directly. Maybe I'm imagining things and there's actually nothing wrong, I'll see if I can try a demo model in the store for comparison.
Forum: Pentax K-3 08-08-2018, 12:33 PM  
K-3II overexposing (after firmware update)
Posted By Roquefort
Replies: 16
Views: 1,181
I checked a few times after this happened, but they're the same settings I've always used. I'm not sure if there is a setting that could cause this anyway.
Forum: Pentax K-3 08-08-2018, 02:37 AM  
K-3II overexposing (after firmware update)
Posted By Roquefort
Replies: 16
Views: 1,181
These are the RAWs, the effect is more pronounced in the jpg preview. But looking at the histogram of these it's clear they are leaning towards the bright side, with blown out highlights. Even if it would have exposed for the subject in the shade (man in the middle), it's still too bright.


Like I said, I'm not used to the K-3 doing this. In similar situations I feel it tended to underexpose - I assume by design, to preserve highlights. Maybe there's a setting somewhere for this that I'm not aware of, but in the 10.000+ photos I took with the original K-3 I can't remember coming across something similar as the examples above. To compare, here's an example of a shot I took with the K-3 with tricky lighting. Of course no two photos are perfectly comparable but notice how this one leans toward underexposure, with actual shadows and no or very little clipped highlights. This is what I've come to expect so the K-3II's metering seems strange to me.
Forum: Pentax K-3 08-07-2018, 04:01 PM  
K-3II overexposing (after firmware update)
Posted By Roquefort
Replies: 16
Views: 1,181
I tried the DA 50mm 1.8 and the DA 16-85mm. Results were the same for both lenses.


I included two examples. I'll admit that they aren't that extreme and can mostly be fixed in post-processing, but the histogram shows clipping highlights for both. And I don't remember ever having similar results with the K-3, which is what worries me a bit. It also didn't happen with the K-3II before the firmware update, although I really haven't had it for long enough to test it extensively yet so it might be a coincidence. Sadly I already sold the K-3 so I can't test the two against each other.


Having a permanent exposure compensation as a fix isn't ideal, because it doesn't overexpose consistently (I just tried, without having touched any settings, under artificial light and the results seemed perfectly fine).
Forum: Pentax K-3 08-07-2018, 01:02 PM  
K-3II overexposing (after firmware update)
Posted By Roquefort
Replies: 16
Views: 1,181
Hi,

I searched around and found several threads about the K-3II overexposing, but I didn't find any real answers as to why it's happening.

I recently bought a new K-3II to replace my older K-3. At first it worked perfectly fine, exactly like the K-3 (as you would expect) but the last few days it started to overexpose some shots. Mostly in situations with sunlight it seems (outside or near a window), but not necessarily in very difficult lighting. I never had this problem with the K-3, which tended to underexpose a bit.


I'm using the exact same settings as I used on the K-3: shooting in RAW, with multi-pattern metering. When I'm shooting in Av or full auto mode, it tends to overexpose. It happens irrespective of lens used.


It seems this started after I upgraded the firmware to version 1.10. I'm not sure if this might be in any way related, and I'm not sure if it's possible to revert to 1.00 (or if it's even possible to download the older version anywhere) to test this.

Has anyone had a similar experience?
Forum: Pentax Forums Giveaways 07-30-2018, 10:00 AM  
July Pentax K-1 Giveaway: Raffle Thread 3, 17:00 UTC, July 30, 2018
Posted By Roquefort
Replies: 75
Views: 3,209
Hello
Forum: Photo Critique 07-29-2018, 11:46 AM  
Streets Enough?
Posted By Roquefort
Replies: 18
Views: 772
The street has those retractable obstacles to close it off for all vehicles except buses, the metal thing is a receiver to control the obstacles.
Forum: Photo Critique 07-27-2018, 03:32 PM  
Abstract Havenhuis
Posted By Roquefort
Replies: 5
Views: 392
The idea was to take a photo of the building in the back, but not put it right there on a pedestal. I think I like the car being there, but I'm not entirely sure.
Forum: Post Your Photos! 07-27-2018, 03:17 PM  
Cityscape Schelde A
Posted By Roquefort
Replies: 3
Views: 170
View of the Scheldt in Antwerp.
Forum: Post Your Photos! 07-23-2018, 01:42 PM  
Travel George, Mark & Ice
Posted By Roquefort
Replies: 4
Views: 214
Thanks!
Forum: Photo Critique 07-21-2018, 06:29 AM  
Streets Enough?
Posted By Roquefort
Replies: 18
Views: 772
Thanks!

Here it is with the bus stop cropped out. Probably better this way indeed.
Forum: Photo Critique 07-19-2018, 11:13 AM  
Streets Enough?
Posted By Roquefort
Replies: 18
Views: 772
Here's a wider crop!
Forum: Photo Critique 07-13-2018, 01:31 PM  
Streets Enough?
Posted By Roquefort
Replies: 18
Views: 772
Thanks for the feedback! I tend to stick to 3:2 ratios out of habit, but this one might indeed benefit from a slightly more flexible crop. I'll give it a try!
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