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Forum: Mini-Challenges, Games, and Photo Stories 3 Days Ago  
The Monochrome Landscape - post yours!
Posted By JensE
Replies: 2,333
Views: 265,734
Warm winter evening in Victoria.



First I didn't realize that I openened a JPEG which I had developed in-camera after changing some parameters, not the RAW file. I like this monochrome rendition though and it doesn't seem to suffer from artifacts. It's not trivial to re-create from the DNG. For a color version see the album.
Forum: Photo Critique 5 Days Ago  
Macro Electro Macro 1
Posted By JensE
Replies: 25
Views: 1,619
I was going to suggest focus stacking and then found that there's a second page ...

There may be a chance still without a macro rail, to get something usable. I'm not sure about how you set up your tripod (assuming it is a tripod), but you can have two fairly steep legs, not extended and footed perpendicular to your optical axis and use the 3rd fairly far spread and extended to 'rotate' your camera in fine increments around that line, e.g. by adding layers of paper/cardboard underneath the 3rd leg. It's likely to produce some unwanted lateral movement as well, but e.g. the free CombineZP is able to compensate that. The slightly different angle of view will likely not cause trouble for this rather 'shallow' subject.
Forum: Lens Clubs 5 Days Ago  
20 mm Lens Club.
Posted By JensE
Replies: 733
Views: 88,218
... so far I'm strong, even though I was tempted and missed a great offer on a DFA 15-30mm just by a few minutes. I still consider my Voigtländer Color Skopar 20mm, which I bought new at a similar price as used A20's go, a bargain compared to that beast. This thread definitely helped with the decision to go for a 20mm prime. The best thing is that I actually have it with me when I need it, because it's so wonderfully compact.

This page lacks pictures. Here's one from a very blue hour. I spotted the place while going down on ski from a tour with my family. After a nice cup of tea, I went back up, packing my tripod this time for some panoramic shots. Being the 20 mm lens club, here's a single frame from a two-frame composition.
Forum: Pentax Forums Giveaways 10-14-2019, 11:22 PM  
Sticky: PentaxForums 100 Year Giveaway - October - General Raffle Entry Thread
Posted By JensE
Replies: 366
Views: 6,857
And another.
Forum: Lens Clubs 10-14-2019, 10:53 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By JensE
Replies: 3,454
Views: 604,219
Very fishy - what building or sculpture is this?
Forum: Mini-Challenges, Games, and Photo Stories 10-12-2019, 09:10 PM  
Thematic Show me your insects
Posted By JensE
Replies: 5,647
Views: 341,408
No, you go first!
Forum: Post Your Photos! 10-09-2019, 06:55 PM  
Nature The Classic
Posted By JensE
Replies: 7
Views: 254
Nice shot. If you really want to cross it off though, start over - it's a fly.
Forum: Digital Processing, Software, and Printing 10-09-2019, 03:04 PM  
The Squirrel Mafia's new & improved RawTherapee thread!
Posted By JensE
Replies: 79
Views: 6,755
The RawThrapee picture above shows a lot more detail in the shadows, while the highlights are just a little more shifted to the bright side. It's a different tone curve, basically adding 'brightness' from 'contrast brightness saturation' and not so much an EV shift in 'exposure'. This still keeps the highlights from clipping, but makes noise reduction a lot more difficult in the shadows. I especially find the color noise on the under- or frontside of the bananas difficult to deal with.
Forum: Pentax K-1 10-08-2019, 02:32 AM  
K-1 sensor shake/vibration while on tripod help
Posted By JensE
Replies: 18
Views: 658
That, in combination with mirror-lock-up, to avoid mirror slap if not using life view, almost completely eliminated shutter-induced blur in my experiments. You can also use SR with the 2s delay timer by using custom setting 21. I haven't found negative effects of keeping SR enabled on a tripod in the respective shutter speed range.
Forum: Photographic Technique 10-05-2019, 01:57 AM  
Action Electronic shutter or manual shutter? K1
Posted By JensE
Replies: 30
Views: 1,968
Even at 1/60 - 1/200 second range, the electronic shutter needs a long time for the exposure. The electronic equivalent of the mechanical shutter 'slit' travels across the image with the readout speed of the sensor, which does less than 5 frames per second, so it needs on the order of 200ms. The mechanical slit approximately travels at the flash sync speed of 1/200 seconds = 5ms. So for anything involving motion fast enough to be stretched at 1/5 seconds between top and bottom, the mechanical shutter would be the preferred. For shots with SR, shutter shock is barely detectable with my camera. Without SR, it is, but still yielding an effective resolution of about half the pixel count in the worst case - far from ruining most shots.
Forum: Mini-Challenges, Games, and Photo Stories 10-03-2019, 02:26 PM  
Thematic Pollinators in action
Posted By JensE
Replies: 670
Views: 35,921
A honey bee on a thistle, laken this summer in France.



Optimizing for space on this trip, this was taken with a DA 55-300 PLM + marumi 330 (+3) Achromat on a KP, cropped to square format on the sides.
For another example, see HD Pentax-DA 55-300mm F4.5-6.3 ED PLM WR RE - Show us what it can do, what it CAN'T! - Page 27 - PentaxForums.com
Forum: Pentax SLR Lens Discussion 10-03-2019, 07:18 AM  
HD Pentax-DA 55-300mm F4.5-6.3 ED PLM WR RE - Show us what it can do, what it CAN'T!
Posted By JensE
Replies: 428
Views: 36,243
For a two-week kayak trip this summer, which included everything from medieval towns to wildlife, I assembled a "compact" kit consisting of my KP with two spare batteries, the DA 18-135mm, HD DA 15mm LTD and, of course, the HD DA 55-300mm PLM, all nicely fitting into a B&W Type 2000 case. Instead of a macro lens, I packed a marumi 330 (+3) Achromat in 58mm for the first time. That proved to be a more than respectable macro solution:



In fact, it's the first time I was tempted to use AF at macro distances. I still have to measure effective focal length/scale and determine the optimal f-stop. For the above, which has a lot more detail at full resolution, I used f/13 (nominal).
Forum: Lens Clubs 10-02-2019, 07:18 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By JensE
Replies: 3,454
Views: 604,219
Early fall colors in the orchard after another hot and dry summer. Samyang 12mm FE.
Forum: Mini-Challenges, Games, and Photo Stories 10-02-2019, 03:06 PM  
Thematic Pollinators in action
Posted By JensE
Replies: 670
Views: 35,921
Even though we had a few hives of honey bees nearby, it's mainly been a variety of solitary bees who pollinated our cherries - with great success.

IMGC1596b_c_s by Jens Em, on Flickr

K-1, DFA100WR @1:1, f/11, square crop (~20mm x 20mm)
Forum: Digital Processing, Software, and Printing 09-26-2019, 01:55 PM  
The Darktable Users Coterie
Posted By JensE
Replies: 91
Views: 6,960
I mostly use RawTherapee and Darktable for photographs that (a) are on the edge of what the camera can handle, or (b) I couldn't convince the camera to render the way I wanted them, or (c) I want to print in large formats. For everything else, I'm using the out-of-camera JPGs.

I have a much longer history with RawTherapee than with Darktable, I edited several thousands of pictures with it, so I'm much quicker than with Darktable. Often I get by with just a few clicks and I know how to squeeze out the last bit of detail when I want to.

I'm sure I can get there with DT, but it will take a lot of practice. I'm determined, bought a graphics card with Linux OpenCL support and have been practicing for 2 years now. Even after studying tools, documentation and tutorials, I still struggle with noise reduction in DT more than in RT. The huge advantage of DT over RT are multiple tool instances and masks, for now.


I usually don't have any trouble with white-balance in RT, in your case I used the pipette on the background, showing how skewed (far from Planck) the WB is:
Temperature: 6111K
Tint: 0.886
(based on correcting your RT-developed JPEG)

After this, it looks much better than the DT version to me.


I don't like RT's automated match to the preview via the first tone curve, mainly because of its bad interaction with EV shifts. Otherwise, The Squirrel Mafia's new & improved RawTherapee thread! - PentaxForums.com provides a high degree of automation with very good results.
Forum: Mini-Challenges, Games, and Photo Stories 09-26-2019, 06:56 AM  
Thematic Show me your insects
Posted By JensE
Replies: 5,647
Views: 341,408
You definitely know how to work with what you have. Good luck fixing the damage.
Forum: Post Your Photos! 09-24-2019, 12:05 PM  
Nature Sweat Bee.
Posted By JensE
Replies: 14
Views: 396
Beautiful photograph, I especially like how the low and soft morning light nicely models the petals and shows a lot of detail on the bee, avoiding blown-out reflections.
Forum: Pentax SLR Lens Discussion 09-24-2019, 11:57 AM  
DA 20-40mm Limited f-stop markings - which f.l. are they for?
Posted By JensE
Replies: 8
Views: 699
A lot of push-pull zoom lenses, like the SMC Penatx-A 35-135mm, have elaborate curves showing the reciprocal DoF curves. Showing the DoF for the minimum and maximum focal lengths on the 20-40mm while at the same time using it to space out the labels is indeed very clever use of the constraint space.
Forum: Pentax SLR Lens Discussion 09-23-2019, 02:49 PM  
DA 20-40mm Limited f-stop markings - which f.l. are they for?
Posted By JensE
Replies: 8
Views: 699
Checking with DOFMaster, using 1000m focus distance (close enough to infinity) and the default 0.02mm circle of confusion, I get the near point for 40mm and f/32 at 2.49m - consistent with the narrow scale. For 20mm, it's 0.62m at f/32 and 1.25m at f/16 - both consistent with the wide scale.

Given the fuzzy nature of the DoF-transition, using the narrow and wide scales at 40mm and 20mm respectively will work as indicated by lytrytyr, within the limits of the wide distance scale spacing and short focus throw.
Forum: Travel, Events, and Groups 08-18-2019, 08:00 PM  
Melbourne Pentaxians: where/what to shoot?
Posted By JensE
Replies: 13
Views: 989
I went almost straight from the business trip on to vacation with family, so I'm getting around to thank you again only now.


Confirmed. The light was indeed stunning.


I enjoyed the sunset on Whisky, only sharing it with a handful others, even on a Saturday night.

What I only discovered on my way back is, that this area is among the darkest anywhere on earth at night, especially when facing south. I only took one sky exposure that night, not having my best gear for the purpose on that business trip, but the milky way turned out better than in all my efforts even in some darker corners of Europe, straight out of camera.


Maybe not exactly my typical genre, but I did especially enjoy the state finals in Wool Handling and Open Shearing in Bendigo that Sunday.

I'll post some pictures over time as I get around to properly process them.
Forum: Repairs and Warranty Service 07-25-2019, 05:56 AM  
Cross Threaded Hood
Posted By JensE
Replies: 10
Views: 616
Given that the hood is the inner part of the thread, cooling instead of heating it may be more successful. But thermally both sides are highly coupled, so you will need to try frequently while you cool it down. A shallow pack of (salted) ice cubes may work.
Forum: Mini-Challenges, Games, and Photo Stories 07-16-2019, 01:35 AM  
Thematic Bad Weather Makes Good Pictures
Posted By JensE
Replies: 494
Views: 31,263
The heavy winds didn't reach the valley bottom, so the drizzle created a serene mood.
Forum: Travel, Events, and Groups 07-16-2019, 01:11 AM  
Melbourne Pentaxians: where/what to shoot?
Posted By JensE
Replies: 13
Views: 989
Thanks, I haven't made plans for the weekend and this sounds like a lot of fun.
Forum: Travel, Events, and Groups 07-15-2019, 11:05 PM  
Melbourne Pentaxians: where/what to shoot?
Posted By JensE
Replies: 13
Views: 989
I remembered this thread and dug it up - thanks also from my side for it. I'm currently in Melbourne likely for the last time in a while. Anything standing out in winter after ~17:00 , i.e. at night? And if anybody is in the mood for an evening photo walk, it's one more week here for me ...
Forum: Mini-Challenges, Games, and Photo Stories 07-15-2019, 03:17 AM  
The Monochrome Landscape - post yours!
Posted By JensE
Replies: 2,333
Views: 265,734
Experimenting with the KP high contrast filter. Maybe I need to tune it a bit, but I like the drama. I hope resizing it on my mobile didn't ruin it.
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