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Forum: Lens Clubs 11-06-2018, 01:47 PM  
Fisheye Fever Club -- Flaunt your fisheye photos!
Posted By JensE
Replies: 3,106
Views: 553,590
Excellent composition! I really like how you managed to use the wide end of the 17-28mm to create a very natural sense of scale, avoiding the extreme perspective distortion of rectangular projections for such wide angles, while still keeping the bent lines under control.
Forum: Photographic Equipment for Sale 11-04-2018, 02:11 PM  
For Sale: Samyang 2.8 14mm ED AS IF UMC
Posted By JensE
Replies: 1
Views: 213
PM sent
Forum: Pentax DSLR Discussion 10-30-2018, 12:09 PM  
KP or K1 Mark II?
Posted By JensE
Replies: 35
Views: 1,797
Forum: Mini-Challenges, Games, and Photo Stories 10-19-2018, 10:13 AM  
Thematic Pollinators in action
Posted By JensE
Replies: 555
Views: 25,998
Congrats to those in-flight pictures, I especially like the 2nd one, with lots of pollen everywhere, and very nice detail without distracting reflections.
Forum: Pentax K-1 10-18-2018, 07:04 PM  
Dynamic Range to ISO comparisson K-1 Vs K-1 Mark II
Posted By JensE
Replies: 6
Views: 650
Dynamic Range is basically the logarithmic ratio between largest recorded signal to noise floor - in their definition of photographic dynamics trange, taking the noise floor scaled to circle of confusion for the sensor format to normalize different resolutions. It sounds like they just scale it based on the detector site size ratio, not actually measure the noise at that resolution.

So if noise reduction kicks in and smoothes out the ISO800 noise significantly below the ISO200 one, the dynamic range can seem to increase. If noise would actually be measured based on a circle of confusion low-pass filtering rather than scaled based on an assumed spacial noise density distribution, things would llikely look different, because the noise reduction invalidates the assumed spacial distribution.
Forum: Photo Critique 10-04-2018, 09:08 AM  
Macro Busy bee
Posted By JensE
Replies: 3
Views: 250
Nothing to be ashamed about, one of my better ones in terms of light quality is made out of a Styrofoam bowl from my local Vietnamese fast-food stand, attached to my flash and lens by a chop stick and two rubber rings - I at least have rinsed it after I finished the rice.
Forum: Photo Critique 10-04-2018, 01:01 AM  
Macro Busy bee
Posted By JensE
Replies: 3
Views: 250
Nice soft light, with not too much fall-off front to back - except for the dark distant triangle, of course. I like the nice depth modeling and control of reflections. Would you mind sharing how your setup looks like?

Over here, it got really cold for weeks, just after cherries had started to blossom. So just a few bumblebees, but almost no honeybees pollinated. With a drought afterwards, harvest was barely mediocre for us.
Forum: Pentax DSLR Discussion 10-02-2018, 12:39 AM  
Zzzzzzzzzzt, Zzzzzzzzzzt with the 55-300
Posted By JensE
Replies: 24
Views: 1,286
And then there is the switchable wheel ... standard on K-1, a C-option on KP.
Forum: Pentax News and Rumors 09-30-2018, 02:56 PM  
46 min Interview with Ricoh's Mr. Baus (in German) from Photokina 2018
Posted By JensE
Replies: 239
Views: 13,983
This is what I thought first too, but continuing he explained the much higher standards, which the photographer has to work to - mentioning that with the DFA50, there is not only the focus on the nose or the eyes, but many layers in between.

My conclusion on the whole interview is that he did not really have too much more information than previously expressed in terms of product development, but he drew and shared rather well-reasoned conclusions from his sales figure knowledge and long experience with Pentax.
Forum: Pentax K-5 09-30-2018, 02:39 AM  
Pentax K5 - faster shutterspeeds than the sync speed of 1/180 for dog portraits
Posted By JensE
Replies: 16
Views: 1,011
The studio flash set is purely manual, no P-TTL. After setting X-Mode and the desired aperture, one then adjusts the flash power (usually at base ISO of 80 if the flashes are powerful enough) and distance to reach the desired exposure and light situation. This can of course all happen upfront with e.g. a friendly human (even the photographer, with timer or remote) placed where the dog later will be.
Forum: Pentax K-5 09-30-2018, 02:13 AM  
Pentax K5 - faster shutterspeeds than the sync speed of 1/180 for dog portraits
Posted By JensE
Replies: 16
Views: 1,011
Your flashes will produce a very short and strong light pulse - the linked technical data sheet lists Flash duration: 1/700-1/1000 seconds. 1/180 is just the highest speed at which the shutter open completely so that the entire sensor can be exposed at once. So as long as you ISO setting together with 1/180 second shutter would heavily underexpose with ambient light, the short flash pulse will determine your effective exposure duration, freezing any motion.

The HSS feature is there to work around high levels of ambient light, you will not need it indoors. HSS sends a series on flash pulses while the shutter 'slit' travels over your sensor, in order to get all parts of the picture properly exposed, it 'smears out' the flash for the duration needed to cover the entire sensor.

Learning proper technique, basically any flash is able to give you sharp and bright pictures indoors, no need for more equipment.
Forum: Post Your Photos! 09-29-2018, 04:15 AM  
Black & White Two happy warriors
Posted By JensE
Replies: 4
Views: 202
I can see nothing wrong here. You linked the 1024x678 pixel flickr image. When I follow the link, the default zoom renders a 1600x1059 sized image for me, which naturally has more details - with the dynamic zoom switching to an even more detailed 2048x1356 rendition. The scaled down versions look OK to me, contrast-wise I can't see a difference, and reasonable post-resize sharpening seems to have happened as well. Histograms look identical, except for the "smoothing" effect for the smaller size due to interpolation. The white vs. black background does make a big difference in appearance with respect to contrast.

In all sizes, a great picture!
Forum: Post Your Photos! 09-28-2018, 04:42 PM  
Black & White Two happy warriors
Posted By JensE
Replies: 4
Views: 202
Is it the default white background on the forum? Try the style selector on the bottom left.
Forum: Mini-Challenges, Games, and Photo Stories 09-28-2018, 04:36 PM  
Thematic Show me your insects
Posted By JensE
Replies: 5,143
Views: 290,058
Even if it's been a while, thanks for describing the process. Now that it's getting cooler, I may have a chance to try it with my subjects. They may still move too much.

You'd weaken the depth cues, your fly doesn't look like it would need any less directed light and may become too flat, a delicate balance. I started to experiment with an asymmetric (adjustable) ring flash for the same reason, but need to build an additional diffuser for it. Another thought may be to use another light to fill in off-camera. I sometimes set up an umbrella next to or even over my entire 'target area', like this, which also helps to avoid too dark or even black backgrounds.

A sample shot, which has been lit using a single reflective umbrella, direct sunlight blocked by it, as the main light source. The diffuse daylight helps to 'fill-in' at maybe -2EV. Square crop from a 1:1 shot on a K-5.
Forum: Pentax K-1 09-28-2018, 09:34 AM  
Specific lenses with K1 for trip to New Zealand
Posted By JensE
Replies: 18
Views: 907
My choices are similar to yours and are family-proven on numerous trips. Often no time to fiddle with things and the 28-105mm reliably delivers. If space/weight is at a premium, leave the 35mm/1.4 and maybe bring a 50mm/1.7 (or the 1.8) instead, if you have one. The wide side of the zoom will likely still be usable even with low light and you still have the fast 14mm.
Forum: Pentax SLR Lens Discussion 09-28-2018, 09:14 AM  
24-70 alternative lens for K1
Posted By JensE
Replies: 43
Views: 2,014
The modern Pentax lenses, and the DFA 28-105 for sure, definitely have an edge over all suggested older fast zooms in terms of flare resistance and WR, both can be important depending on you shooting locations (dust) for your first priorities, and definitely often are for landscapes. They also feature fast, silent and reliable AF. Depending on what kind of "Photojourno" you do, supported by a fast prime (e.g. FA 35mm/2.0 or F(A) 50mm/1.7), as suggested above, it may cover all you need and then some, and is definitely very portable. If however you need to cover varying distances in low light indoors, I'd go with the 2.8 Tamrom zoom (inexpensive, lightweight, good quality from f/4 usable at f/2.8), or the Sigma HSM if silent AF is a must. Add a prime if you find a need for a specific application.
Forum: Pentax SLR Lens Discussion 09-26-2018, 04:07 PM  
Which 3rd party PK lenses you treasure the most?
Posted By JensE
Replies: 75
Views: 3,307
I do love the Samyang fisheyes, especially the 12mm f/2.8 . However, I do treasure - as in always keeping it with me, when I go out with my camera - the far from perfect, tiny, wonderfully built Voigtländer Color Skopar 20mm f/3.5.
Forum: Troubleshooting and Beginner Help 09-17-2018, 06:23 AM  
Sensor Cleaning
Posted By JensE
Replies: 18
Views: 854
First step, and often successful for such rather large dust particles, is to use a blower - see this tutorial. It also covers further options.
Afterwards, if insufficient, I have used the Pentax O-ICK1 rather sucessfully, both with sticky dust and more smudgy stuff. Quick and simple, but somewhat pricey.
Forum: General Talk 09-14-2018, 01:58 PM  
What Do Fellow Pentaxians Do For A Living?
Posted By JensE
Replies: 171
Views: 10,236
After some initial years in research in theoretical physics, I found myself on the path of becoming a research institution nomad. Instead I settled down and am still working on my first commercial job after 18 years, but for the 6th company. I try hard to make sure that software which we develop keeps a certain high-value kind of data for a certain industry, who all of us depend on to participate in this forum, secure and always available.

While I stayed local, the closest people who I regularly work with are more than 6000km away and I'm constantly stretched between times zones ranging from one side of the pacific to the other. Unfortunately from west to east, so my posts could come in any time of the day. But I do enjoy the occasional opportunity to visit other sites, where my interest to stay over one weekend for photographic opportunities nicely aligns with much less expensive flights when I do.
Forum: Pentax K-1 09-14-2018, 12:44 PM  
K-1 Mark II focus peaking colors?
Posted By JensE
Replies: 12
Views: 626
I would not generalize this, it depends on your subject: I use it and it helps me to correctly place the plane of focus. It's one thing to focus on a point, but in macro shots it helps me to adjust the angle at which I'm shooting, so that the thin in-focus range e.g. covers the intended body parts on an insect. Being able to change color, or even select to use the complementary color for outlining, would be a huge plus for me. With a sense of DoF, I definitely use it for critical focusing within some tenth of a millimeter in 1:1 handheld shots successfully - often not instead of, but in conjunction with magnified live view.
Forum: Mini-Challenges, Games, and Photo Stories 09-11-2018, 03:02 PM  
Thematic Magical Light
Posted By JensE
Replies: 83
Views: 2,082
Sometimes, you don't need much more than the magical light itself.
Forum: Pentax SLR Lens Discussion 09-11-2018, 02:03 PM  
Questions about the D-FA 100 f/2.8 WR
Posted By JensE
Replies: 40
Views: 1,431
With a bit of practice, you can make it work for your purposes. But the AF usability definitely depends on the camera: while I was able to get the shot in Sports photography - single images - Page 18 - on a K-5, it could easily go hunting and then you have to quickly get off the trigger (or AF button) and down again in order to reverse direction. As I noted, it is much easier to use on my K-1, because it rarely misses focus. For portrait use, see also Why not fill as many slots as possible in one's kit with macros? - Page 2 - for comments and an example.
Forum: Mini-Challenges, Games, and Photo Stories 09-11-2018, 01:37 PM  
Thematic Magical Light
Posted By JensE
Replies: 83
Views: 2,082
Thanks for coming up with the idea, "Crepuscular Rays" for sure is stunning.
Forum: Mini-Challenges, Games, and Photo Stories 09-11-2018, 04:35 AM  
Thematic Magical Light
Posted By JensE
Replies: 83
Views: 2,082
Hard to choose from many pictures taken last October on Lofoten, where light was magical most days and nights.
Forum: General Photography 09-09-2018, 06:41 PM  
ADHD and Photography - Share your experiences
Posted By JensE
Replies: 11
Views: 669
I do agree with others above: While I can only try to imagine how ADHD makes thing worse for you, I struggle(d) with almost every single point in your list. While I usually can stay focused on a topic, for me it's hard to not get lost and stop instead of staying up all night and be totally exhausted the next day. Organization-wise, my huge desk has exactly as much empty space as I need to move the mouse, and most of my gear is spread out in boxes on the floor of my office currently ...

Here are some strategies and experiences for your points above, which helped me to continue to enjoy photography:
  1. Organizing gear: I have way more stuff than I can possibly make good use of. I decided for me, that this is OK for now - those are collected items, and I can afford to keep them, and keep them unorganized. I don't need to earn a living with it, nor do I have any other obligation to use my equipment. I keep a bag ready with my current, most frequently used stuff and have a smallish compartment in a cabinet which holds some extra lenses. If I start a project which involves a specific item, I go through the boxes (and stuff on my desk) to locate it. May take a while. I intend to sell some stuff when I get around to it, but I keep it fun by not putting any pressure on myself. If you find yourself in a tight spot, it may help to force yourself to put up something of equivalent size/value/purpose for sale before scoring the next gem - the best motivation to actually get through it.

  2. Managing libraries: Not shooting too often and too many things, I stick to YYYY/YYYY-MM-DD_Event (so both), wheres the date is the last day associated with the event, e.g. vacation. At the top level, I seperate family from 'experimental' pictures - where the family part is to be kept comptible with software, which my wife prefers to use. Last day works quite well with software which uses the current date as default for import, and helps to know how far I cought up reading stuff from memory cards.

  3. Getting motivation to go out shooting: Again, I accept that it's simply OK to not shoot for a while. What kept me motivated to try something new for a while was a weekly challenge. I still miss Project52, which had a very engaging model.

  4. Culling and post-processing: A constant struggle, and one, where do I have a really hard time to stay focused and results-oriented. What seems to work best for me is to only delete the obviously technically bad photos (a good tool like FastRawViewer helps). Then I work from the other side: I try to identify a very small set of represetative photos from an event, e.g. 9 vacation photos and bring them only to the level of presentable/small print. This can easily be shown to friends or family. Out of your redudant six, I'd simply pick one that's good enough, doesn't have to be perfect. Make the number of the first collection really small, so that you get through in a really short time! Don't include any shots which need a lot of post-processing, so you can get through in a single session. Then, as you can find time and motivation, you can build out a larger set for the event on top of that. Pick whatever you find most compelling and process/add it whenever you feel like it. This way, you always have a presentable set of your best or representative shots after the first session. Again, key for me is to be OK with my shortcomings and know I may never delete everything non-presentable, knowing I have seleceted some to show. I can archive the rest and go back whenever I like, which does actually happen sometimes. Not forcing myself to delete everything else helps to make a quick decision on picking something - knowing I can revise my decision later if it turns out it wasn't so good.

  5. I have been on a week-long backcountry trip when a battery in my electronically controlled analog camera died. Photographed two days without any film in the camera on a different trip, left my memory card in the PC. Had to improvise a charger on a two-week business trip ... Your get over it, and I still remember that backcountry trip vividly. What helps me in other places (sports equipment) is a checklist for the essentials. You can put one into your camera bag. With digital camera, a memory card, a charged battery and any lens, you can take pictures. The rest is bonus. Many people carry a phone with a halfway decent camera anyway - often a good enough backup and an interesting challenge.

  6. Wrong lens syndrome: I usually don't suffer from it, but then tend to carry too much. It usually helps to think about what I roughly want or can shoot and select upfront. It helps even more to learn about insignificance of gear compared to composition and lighting. I tend to take the vast majority of pictures with two "boring" but reliable lenses. If it needs a special lens to make a picture good, the gap is behind the camera, not in front of it. Again, accepting not everything will be perfect every time, and focusing on the moment instead, is what helps me to be very satisfied with my hobby.

  7. Posting/sharing: You can start by picking a periodic challenge, with a specific topic. Or one or two of the thematic threads, which you find interesting. Stick with it for a while - which definitely helps with point 3., motivation.

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