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Forum: Film SLRs and Compact Film Cameras
09-25-2018, 02:15 PM
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Not ordinarily interested in slide film, but:
Alright, that's it, I'm clicking...
...You weren't kidding! Obnoxious, sluggish, unnecessary animations? Check. Nonsense cookie banner overlay? Check. Social media button overlay? Check. Full-page newsletter overlay? Check!
I clicked, but I did not read.
Sorry to derail. |
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Forum: Post Your Photos!
09-11-2018, 01:44 PM
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Allow me, then. :D
I am udderly disgusted by the deviant tendencies displayed by several senior forum members in this thread, milking a poor creature's innocent expression for all its worth. This exploitative photo is not the work of a stable person!
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Forum: Pentax SLR Lens Discussion
06-09-2018, 08:51 AM
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This is normal. The focus ring turns past infinity to accommodate infrared photography - the small 'R' on the DOF scale indicates focus in the infrared spectrum.
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Forum: Troubleshooting and Beginner Help
06-07-2018, 07:15 PM
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Congratulations. I own this lens and I love it to bits, it's phenomenal.
As for a hyperfocal explanation, let's look at a picture of the lens:
Starting at the bayonet and moving forward, we see the tacky "neutrino noating" branding, and then some markings of interest: first, the depth of field scale, then the distance scale with markings in metres and feet.
The numbers on the depth of field scale,
16 11 8 | 8 11 16,
correspond to aperture settings; at f/8, everything between the two 8s will be in focus. The central | is the focus mark proper.
In the photo, focus is set to infinity - the infinity mark (∞) on the focus ring lines up with the central focus mark on the depth of field scale.
To focus the lens hyperfocally for f/8, we will turn the focus ring until the infinity mark lines up with the right 8 on the depth of field scale. The left 8 will now be somewhere near 2 metres on the distance scale. Now, everything beyond a couple of metres should be in focus, at least in the centre of the image.
Hyperfocal focusing is not an exact science since different people have different opinions on what constitutes acceptable sharpness. You have lots of time to familiarise yourself with the lens and determine if you "agree" with the depth of field scale; I don't think there's anything to be nervous about!
By the way, there's an Irix thread in the lens club forum which may be of interest to you.
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Forum: Pentax K-5 & K-5 II
05-11-2018, 05:56 AM
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I went through a very different process, so my perspective may or may not help you at all.
I had a K-5, loved it, broke it, replaced it with a K-3, and I love that every bit as much. Later, I bought a K-1. Compared to the revelation that was the K-1, the differences from K-5 to K-3 seem miniscule. The K-5 struggled with PDAF in tungsten light, but had marginally better dynamic range than the K-3.
Had I not broken my K-5, I don't think I ever would have bought a K-3.
As a second camera to complement the K-1, I prefer the K-3 because it's different. The pixel pitch is tighter, which is nice for telephoto use, and the frame rate is higher. From what I can remember, the K-5 performs almost exactly like a K-1 in crop mode in terms of speed and image quality.
I know your question is about the K-3, but in my opinion, the K-1 is a steal and is the real upgrade. (Your lens collection may say otherwise; mine was mostly already FF compatible.)
Sorry for being that guy... |
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Forum: Pentax SLR Lens Discussion
02-02-2018, 08:19 AM
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Forum: Post Your Photos!
01-31-2018, 06:59 AM
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I guess I'm weird. :p I just love snow, and Denmark never gets much. I don't ski, so a skiing resort would have made little sense. Kiruna gets loads of snow, is large enough to offer plenty of sights to see and things to do, has an airport, and is generally a convenient starting point. And the surrounding terrain is beautiful.
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Forum: Post Your Photos!
01-30-2018, 03:39 PM
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Fed up with the rainy, grey, totally-not-another-autumn season that passes for winter in Denmark, I booked a flight for Kiruna in northern Sweden. Situated well north of the arctic circle, this city lives and dies with the iron mine that created it at the beginning of the 20th century. Much of Kiruna lies above the ore body being mined, with some 3000 residences and the entire city centre sitting on soon-condemned land. The town is currently in the early stages of moving, with a new town hall nearing completion.
The state-owned mining company LKAB is named after the two mountains containing most of the ore body, Luossavaara and Kiirunavaara, both of which have deep scars from decades of open-pit mining. The Luossavaara mine is now closed, while the Kiirunavaara mine has been underground since the sixties. There are guided tours underground and, from what little I saw - visits are restricted to a visitor's centre sealed off from the rest of the mine - it is a vast complex. The deepest main level is currently at 1365 m, as measured from the original summit of Kiirunavaara, with hundreds of km of underground roads.
Overlooking Kiruna from the base of Luossavaara, with the LKAB surface facilities on the right.
K-3 with SMC DA 15 Ltd @ f/13, 1/250 s, ISO 100, tonemapped
From Järnvägsparken ("Railway Park") in the city centre. The railway has already been relocated, with a temporary station 2 km away.
K-3 with SMC DA 15 Ltd @ f/13, 1/30 s, ISO 100
Low sun in Järnvägsparken.
K-3 with SMC DA 15 Ltd @ f/13, 1/180 s, ISO 100, tonemapped
Artyfarty nonsense interlude: looking into a block of ice at the snow playground.
K-3 with SMC DA 15 Ltd @ f/13, 1/90 s, ISO 100
Kiirunavaara at dusk.
K-3 with SMC DA 15 Ltd @ f/13, 1/45 s, ISO 100
Luossavaara as seen from the LKAB access road.
K-3 with SMC DA 15 Ltd @ f/8, 1/8 s, ISO 100
A panoramic view of Kiruna and Kiirunavaara. Uploaded at full size - click through for the 50 MP original.
K-1 with DA* 55 @ f/8, 1/60-1/45 s, ISO 100, 3 shots stitched
The northern lights eluded me, but everything else exceeded my expectations. I suspect this place looks vastly different in the summer, and I may return some day...
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Forum: Post Your Photos!
01-30-2018, 12:29 PM
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It's amazing what you can carve out of a cube of snow if you know what you're doing...
"The Queen of Nature," Estonia.
K-3 with SMC DA 15 Ltd @ f/13, 1/250 s, ISO 100
The Canadians at work.
K-1 with DA* 55 @ f/1.4, 1/10 s, ISO 100
The Spanish team. Well, half of it.
K-1 with DA* 55 @ f/2.8, 1/10 s, ISO 100
Smoothing the many curves of what will become "The Third Space."
K-1 with DA* 55 @ f/1.4, 1/10 s, ISO 100
"Snow Cathedral" under construction by a Swiss-Catalan team. This would go on to win the jury award.
K-1 with DA* 55 @ f/1.7, 1/10 s, ISO 100
Team Canada's "Polar Bear Hug," winner of the artists' choice award.
K-1 with DA* 55 @ f/5.6, 1/4 s, ISO 400
"Polar Bear Hug," reverse.
K-1 with DA* 55 @ f/5.6, 1/4 s, ISO 100
The gravity-defying "Ghost Skirt" by a British team.
K-1 with DA* 55 @ f/5.6, 1/4 s, ISO 280
The sculptures are best viewed at night, the hard shadows accentuating every shape. |
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Forum: Post Your Photos!
01-30-2018, 11:15 AM
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This remarkable building is to be dismantled and relocated east along with much of the city centre, lest it crumble when the iron ore body beneath it is mined and the terrain subsides to fill the void.
K-1 with Irix 15 @ f/2.4, 1/2 s, ISO 100
K-1 with Irix 15 @ f/2.4, 1/2 s, ISO 100
K-1 with Irix 15 @ f/2.4, 1/2 s, ISO 100
K-1 with DA* 55 @ f/8, 1/45 s, ISO 100 |
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Forum: Post Your Photos!
01-30-2018, 10:43 AM
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The iron ore from the mine in Kiruna is shipped out from the North Atlantic port of Narvik in Norway. The trains serving the mines in the area are exceptionally heavy by European standards, with axle loads of 30 tonnes from Kiruna to Narvik and 32.5 tonnes from Malmberget to Luleå on the Baltic coast. 10 trains leave Kiruna daily, each grossing 8,600 tonnes and held together with Russian SA3 couplers. At 10.8 MW per pair, the purpose-built single-ended locomotives are not obscenely powerful for their size, but the high axle load enables a very high tractive effort of 1400 kN. Net energy consumption for a roundtrip is near zero thanks to regenerative braking and favourable terrain.
I had to cross a ditch with chest-deep snow to get this shot, and I broke my tripod's pan/tilt handle because the grease froze solid. It was totally worth it.
K-1 with DA* 55 @ f/8, 1/45 s, ISO 100
Setting off from the mine in Kiruna.
K-3 with SMC DA 15 Ltd @ f/5.6, 1/45 s, ISO 100
K-3 with SMC DA 15 Ltd @ f/5.6, 1 s, ISO 100 |
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Forum: Post Your Photos!
01-30-2018, 09:24 AM
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This is apparently a thing up here in Kiruna. As a fake Viking pansy Dane, I was equally delighted, bemused, and apprehensive about this spectacle; the natives seemed to really enjoy it.
The track awaits.
K-3 with SMC DA 15 Ltd @ f/13, 1/250, ISO 100
Ready.
K-3 with SMC DA 15 Ltd @ f/13, 1/20, ISO 100
"Gentlemen, start your engines!"
K-3 with SMC DA 15 Ltd @ f/13, 1/20, ISO 100
I swear there's a race going on in there somewhere...
K-3 with SMC DA 15 Ltd @ f/13, 1/30, ISO 100
There they are.
K-3 with SMC DA 15 Ltd @ f/13, 1/20, ISO 100
We have a winner.
K-3 with SMC DA 15 Ltd @ f/13, 1/20, ISO 100
The younger natives seemed particularly excited about this celebratory post-race ritual.
K-3 with SMC DA 15 Ltd @ f/13, 1/20, ISO 100
I cannot claim to fully understand their culture, but I enjoyed this brief glimpse into the ways and customs of the north. :lol:
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Forum: Lens Clubs
01-29-2018, 02:14 PM
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Kiruna Church, Sweden.
Not corrected for vignetting since doing so brings out the infamous halo flare; the middle chandelier is dead centre.
K-1 with Irix 15 @ f/2.4, 1/2 s, ISO 100 |
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Forum: Lens Clubs
01-29-2018, 12:51 PM
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From Järnvägsparken in Kiruna, Sweden.
K-3 with SMC DA 15 Ltd @ f/13, 1/180 s, ISO 100, tonemapped |
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Forum: Pentax SLR Lens Discussion
11-08-2017, 06:22 AM
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If you select the APS-C crop, you will get the field of view of a 450 mm lens, yes.
But I'd suggest you record the full frame and then crop as needed in post.
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Forum: Pentax SLR Lens Discussion
11-01-2017, 06:44 PM
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Irix lenses are manual focus but communicate all lens parameters, including focal length, to the camera body.
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Forum: Digital Processing, Software, and Printing
09-28-2017, 05:08 PM
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Mystery solved! Thank you, this was bothering me way more than I expected it to.* :hmm: I've never noticed artifacts in embedded JPEGs, probably because I only take a cursory glance in Browser mode before switching to Laboratory.
(The relevant setting in DCU5 is Tools - Options - Image Display - Display RAW File in Browser Mode.)
*leekil briefly made me feel like XKCD #386, and that's not healthy... |
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Forum: Digital Processing, Software, and Printing
09-26-2017, 07:01 AM
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Not to the extent of selectively lowering the resolution and grossly enlarging the artifacts, no.
Look at the screenshot again, the original upload. Here. The file being viewed is a DNG file, at 4x magnification. There are subtle JPEG artifacts in the UI, but the artifacts in the image display area are severe and severely magnified, which tells us they are somehow part of the DNG file on display, rather than being caused by compressing the screenshot.
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Forum: Digital Processing, Software, and Printing
09-25-2017, 11:26 AM
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I don't agree that the macroblocking we're seeing here is the result of Pixel Shift. It shows all the telltale signs of lossy image compression. How a DNG can come to look like this is a complete mystery to me.
If possible, please upload the original DNG file somewhere. I'd love to take a look at it myself.
If that were the case, the artifacts would be all over the screenshot, but they're only visible in the image display area; the UI looks clean and crisp, so the JPEG compression applied to the screenshot has nothing to do with the artifacts we're seeing.
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Forum: Digital Processing, Software, and Printing
09-21-2017, 07:31 AM
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Something is very fishy here because I am seeing obvious JPEG compression artifacts on what is supposedly raw sensor data. There's macroblocking (the "square patchwork" in your description) all over the image display area of that screenshot. I don't know how, but that "DNG" file clearly went through heavy-handed JPEG compression at some point.
Edit: the original, full-size JPEG export looks much better at high magnification that what I'm seeing in your screenshot.
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Forum: Troubleshooting and Beginner Help
09-18-2017, 05:28 AM
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DCU works with DNG files, even with both pixel shift and motion corection enabled. There is something else at play here.
It's possible (but very unlikely) the copies you made are corrupted somehow; try basing your edits on the original file. No raw developer should directly modify the original in any way, and I've never heard of one that does - all output is written to a separate file.
If this still doesn't work, try creating a JPEG in the camera; if this also fails, there's something wrong with the memory card.
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Forum: Lens Clubs
09-15-2017, 02:47 PM
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I'm no expert on bovine manure, but going by you account, "ukdigital" are full of it. :fedup: If all your other lenses work on the K-3, there's no way its lens mount is defective. I think you should consider telling Irix about your experience with this company; I've seen a few posts about decentered lenses now, but it's difficult to judge the magnitude of the problem from anecdotes, and I get the impression Irix are less dismissive about grievances than this shop.
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Forum: Lens Clubs
09-14-2017, 08:03 AM
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Both edges look soft, the left perhaps more so. This might be field curvature failing to maintain infinity focus throughout the frame at f/4.5, combined with slight decentering. Have you tried different focus settings, comparing the centre and edges in live view? At f/4.5, you may need to use a compromise focus setting, rather than focusing for peak sharpness in the centre of the frame.
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Forum: Lens Clubs
09-13-2017, 02:09 PM
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Those metadata don't make a lot of sense; my K-1 certainly doesn't pretend my Irix is a Sigma zoom lens. I'm curious how this could have happened.
And if the edges are that bad on APS-C, you are right to demand a replacement, and the shop are full of BS blaming it on the lens mount. My copy looks impeccable on full frame, even with pixel shift enabled and the sensor shifted ouside the nominal image circle. Ideally you'd test the replacement with a full frame camera, but at least use Composition Adjustment to get as far into the corners as possible.
Good luck.
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Forum: Pentax DSLR Discussion
09-09-2017, 11:07 AM
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This is true, but now we're talking about overall shutter lag. The original question was whether IBIS slows AF. If, instead, we ask whether IBIS slows down shooting, as you've mentioned, the answer depends on whether the sensor assembly is already 'primed'. In certain cases, it won't be.
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