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01-29-2021, 10:23 PM   #31231
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QuoteOriginally posted by RobA_Oz Quote
No local cobbler to turn it into shoes or a handbag?
I remember once in Adelaide I found a dry snake skin in my yard. The thing that worried me was that the snake also left its skeleton inside the skin.

01-30-2021, 12:41 AM - 3 Likes   #31232
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K-1 and Zeiss 135mm

K-1 with Carl Zeiss 135mm APO Sonnar f 2.0.
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01-30-2021, 02:05 AM - 7 Likes   #31233
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Esplanade, Jan2021 - reflections on a new year by
pinholecam02, on Flickr

K1+Laowa 12/2.8
01-30-2021, 03:45 AM - 22 Likes   #31234
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Light on the Road (DFA 24-70mm)



01-30-2021, 06:59 AM - 9 Likes   #31235
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We don't get much snow in our part of Germany, but nevertheless, it was a pleasant walk through the forest today.

All of these are taken with the SMC K 2.5/135mm on the K1.
I am impressed how nicely this more than 40 year old lens renders, especially the wonderful separation between sharp and unsharp areas giving a great sense of depth.







01-30-2021, 08:18 AM   #31236
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QuoteOriginally posted by heckflosse Quote
Sure, provide a pixelshift raw and a flat field raw. Then I will have a look ;-)
Great!

This afternoon I setup a dropbox folder with two subfolders. In one subfolder you'll find dng files from today, the other one contains my C1Pro and RT results for single frame development, multi frame development results of course only from RT.

Besides a PSR you'll also find a HDR shot of a tree with an opal capture (needs to be turned by 90°). I don't know if RT can develop an HDR file using all the three frames, but maybe you know and can try the flat field correction also for the HDR multi frame shot if possible. Until now I use RT only to develop my Pentax PSR files.

Please PM me your email address. Then I'll invite you to access the folders. Many thanks in advance!

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01-30-2021, 09:07 AM   #31237
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QuoteOriginally posted by acoufap Quote
An info for people who are interested in this LCC thing! I just discovered everybody can use this functionality - not only Capture One Pro users!

In RawTherapee this function is called "Flat field correction". Very good description at RawPedia - the documentation of RawTherapee. Additional infos you find in wikipedia - article Flat-field correction.

Tried it in RawTherapee. Works with single frame raw files. Unfortunately applied to PSR files using Pixel Shift demosaicing the function seems to overcompensate. Results not usable.

@heckflosse: any chance you could extend the impementation in RT so that it works with pixel shift? Would be great IMO - and a unique feature! By the way - thanks for your great work and effort!
Went to that wikipedia article to see what this was about, Had to lie down until my head stopped spinning, Decided further investigation of flat-field correction was unlikely to result in significant improvement in photos of my dog. Sighed with relief and went back to screwing up simple stuff.

01-30-2021, 10:03 AM - 4 Likes   #31238
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I found my missing studio lights! Seems my wife has taken a fancy to them. She is making baby blankets. K1-II with TAMRON-F MULTI/C 28mm f2.8 lens. I have had this lens for some 30 plus years when I got it new. I think it was all of $40 or so back then.
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01-30-2021, 10:19 AM - 3 Likes   #31239
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QuoteOriginally posted by dadipentak Quote
Went to that wikipedia article to see what this was about, Had to lie down until my head stopped spinning, Decided further investigation of flat-field correction was unlikely to result in significant improvement in photos of my dog. Sighed with relief and went back to screwing up simple stuff.
This technique is helpful if you are shooting raw and use raw converters that deliver no lens profile for your lens.

By example I use the DA*11-18 down to 15mm in FF mode on my K-1 - it clearly shows visible vignetting. 15mm is the widest you can go without lens hood on FF. Shorter FL shows the image circle. No lens profile in Capture One, RawTherapee or Affinity Photo. These are the raw converters I use. The vignetting standard tools suffer IMO.

But using prepared LCC / Flat Field Correction you get really rid of any vignetting - if possible. Another example: you use a 100mm Filtersystem and want to get rid of one sided shading. No problem if you first shoot the scenery trough opal glass and create a special LCC profile from it. Much better and easier than applying a digital GND in post.

This technique works for every lens - but you have to shoot raw. It costs some effort. If you don't like this, it's surely nothing for you.

Illustration:


Vignette of DA*11-18 @ 16 f/8 in K-1 FF mode


LCC profiled in C1Pro


C1Pro LCC corrected image - first single frame of a PSR capture

This image is a PSR image. At the moment I have to decide to develop as PSR with vignetting included or apply the LCC profile. It would be nice if it would be possible to develop such images as LCC / Flat Field corrected PS images in Raw Therapee.

Last edited by acoufap; 01-30-2021 at 12:39 PM. Reason: Images added for illustration
01-30-2021, 10:45 AM   #31240
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Thanks, acoufap--that did give me a clue! I doubt I'll get to the point where I think about such things in this lifetime but It's good to know there are Pentaxians at that level.
01-30-2021, 11:49 AM - 8 Likes   #31241
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FF Mode • 100 ISO • Pentax DA* 55mm F1.4 SDM • Metz Flash MecaBlitz M400 with softbox


FF Mode • 100 ISO • Pentax DA* 55mm F1.4 SDM • Walimex Pro Flash 3x VC-400


FF Mode • 100 ISO • Pentax FA* 24mm F2 IF AL
01-30-2021, 01:42 PM - 6 Likes   #31242
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Shot with the Samyang 24 1.4

01-30-2021, 08:47 PM - 4 Likes   #31243
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Rusting Future

January 30, 2021
Cayucos, California
Pentax K-1 Mark II SE, Pentax smc P-F 35-105mm f/4-5.6
f/11 1/125 ISO 200
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01-30-2021, 09:16 PM - 1 Like   #31244
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Tonight's moon with the D FA 150-450 + Kenko 1.5x TC.

Last edited by wtlwdwgn; 02-01-2021 at 10:08 AM.
01-30-2021, 11:19 PM - 11 Likes   #31245
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K-1ii & 15-30
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