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Forum: Pentax News and Rumors 2 Days Ago  
[New video Oct 27] New information about upcoming APS-C flagship model
Posted By AstroDave
Replies: 489
Views: 27,805
That might be irrational (nerdy math joke)
Forum: Pentax K-1 10-11-2020, 11:29 AM  
Post your K-1 pictures!
Posted By fs999
Replies: 30,514
Views: 2,752,767
FF Mode • 200 ISO • Sigma Art 18-35mm F1.8 DC HSM

FF Mode • 200 ISO • Sigma Art 18-35mm F1.8 DC HSM

FF Mode • 400 ISO • Pentax FA* 24mm F2 IF AL
Forum: Pentax Medium Format 10-01-2020, 09:53 AM  
Post your medium format photos!
Posted By itshimitis
Replies: 15,307
Views: 2,552,374
Thank you!

A different edit and crop to the barn shot...

Galava Field misty edit by singingsnapper, on Flickr
Forum: General Talk 09-21-2020, 04:28 AM  
The Joke Thread
Posted By SSGGeezer
Replies: 3,269
Views: 258,942
New to me! And very funny!
Forum: Pentax SLR Lens Discussion 07-15-2020, 01:15 AM  
The Bokeh Club
Posted By 5r82
Replies: 20,118
Views: 1,779,235
K 1 + K 50 1.2

Forum: Pentax SLR Lens Discussion 07-06-2020, 03:08 AM  
The Bokeh Club
Posted By 5r82
Replies: 20,118
Views: 1,779,235
K-1 + Samyang 85mm f1.4

Forum: Pentax News and Rumors 08-29-2020, 09:40 PM  
Silver limited editions coming out: K-1 II + DFA Stars
Posted By Nakedgun
Replies: 71
Views: 8,264
This has finally pushed me into FF. Preordered today.
Forum: Pentax Medium Format 09-11-2020, 05:20 AM  
Post your medium format photos!
Posted By MFullana
Replies: 15,307
Views: 2,552,374
A quick on location portrait taken with the 645z, 55mm 2.8 and HSS with the Flashpoint Pro1200 pack and Ring flash
Forum: Pentax KP 08-21-2020, 05:26 AM  
Post Your Best KP Shots
Posted By noelpolar
Replies: 2,584
Views: 251,883
Red Capped Robyn Female.... DFA 150-450 (Over sharpened I think.... playing with a one month trial of Capture one). A flighty thing.... but tricked it with a phone app.

Forum: Post Your Photos! 08-31-2020, 03:45 PM  
Nature Mylitta Crescentspot
Posted By DW58
Replies: 6
Views: 281
They love the Asters.
Forum: Post Your Photos! 12-09-2019, 06:37 AM  
People Street person
Posted By Crombie
Replies: 11
Views: 412
This man lives on the street. He is tough as you'd expect but in conversation is very affable with a witty sense of humor.
Forum: Pentax Medium Format 08-08-2020, 10:48 PM  
Post your medium format photos!
Posted By Pentaxrookie
Replies: 15,307
Views: 2,552,374
From my recent shoots. Fun with old stuff:

The Mystic

FA645 45-85mm F4.5 @55mm f25

---------- Post added 08-08-20 at 10:51 PM ----------

And here another one from a few days ago:

Ducks On A Pond

FA645 45-85mm F4.5 @60mm f8
Forum: Pentax News and Rumors 07-21-2020, 05:23 AM  
What Pentax Values Most in Future Cameras
Posted By Kunzite
Replies: 363
Views: 25,028
I'd suggest Huawei, which can make pictures as good as a DSLR ;)
Forum: Pentax DSLR Discussion 07-19-2020, 08:54 AM  
The Pentax approach to photography and camera design.
Posted By StiffLegged
Replies: 65
Views: 4,274
He's a Sony Artesian? Well, well well! :lol:
Forum: Pentax K-1 07-08-2020, 02:16 AM  
Post your K-1 pictures!
Posted By Kerrowdown
Replies: 30,514
Views: 2,752,767
About this thing growing in the garden... "Triffids R Us"
Forum: Ricoh GR 05-30-2020, 08:15 AM  
GR III - photos from owners
Posted By Welshbhoy
Replies: 775
Views: 53,106
What a joy this little beauty is, a handful of my favourites from the last year.

That's an Anne Boleyn handful :D
Forum: Pentax DSLR Discussion 06-13-2020, 09:47 AM  
The Six-Megapixel Club
Posted By Jan178
Replies: 1,811
Views: 155,998
the view

720nm IR, 18-55mm kit lens, *ist DL

[IMG]the view by Jani Fofonoff, on Flickr[/IMG]
Forum: Digital Processing, Software, and Printing 06-05-2020, 04:00 AM  
Megapixels vs Maximum Printing Size
Posted By biz-engineer
Replies: 32
Views: 2,198
There is the relative enlargement , viewing distance , image detail content etc. as mentioned above.

In absolute terms, experience shows that pixel count comes last as enlargement limit.

1) What comes first is lens CA => manual CA correction (automatic correction only does a partial job).
2) Lens corner sharpness (lack of) shows second, local sharpening can help a bit, but what can be done is limited
3) Eventual diffraction softening can show up depending on aperture

4) Pixel pitch vs image detail (contour description, up-sampling avoid visible pixelation, sharpening has limits

Print at 150 ppi still delivers good quality if lens is sharp corner to corner or in case of center square crop (removing softer / fuzzy area of image).
Print at 300 ppi is overkill for 100% sharp lens, 200 ppi is very good already. Having said that , sharpness drops from center to corners for all lenses, to lesser extent for the best lenses (e.g macro lenses).
Lens circular properties vs rectangle sensor plays such role that a square crop can be printed at the same size as the long size of a 3:2 print of an image capture with the same lens and same camera.

Examples of prints all upsampled at 300 ppi , with optimal sharpening / unsharpmasking:
- K1 D-FA 28-105 print 28x41", ISO200, @ 28mm f10: softness in corners visible, some minimal diffraction (softening tiny details)

- K1 D-FA 28-105 print 24x36", @ 28mm f8: very good perceived quality edge to edge (corner softness almost invisible with best efforts)
- K1 D-FA 28-105 print 32x32", @ 35mm f8 center square crop: very good quality edge to edge , that's ~150 ppi (4912/32).

- K1 HD-FA 35 2 print 28x41", @ f8: very good quality edge to edge.
- K1 D-FA 100 macro @ f8, print 24x36": to quality edge to edge

- K3 Tamron 17-50 SP @ 17mm f8, print 19x28": square center of print is crisp, visible softness in corners and top/bottom of frame long side.
- K3 DA 15 ltd f11, print 19x28": square center of print is good, distracting fuzzy corners very visible.
- K3 Tamron 17-50 SP @ 50mm f5.6, ISO 100, shutter speed 1/500th, print 20x30", very sharp across the frame
- K5 DA 17-70 @ 17mm f8, ISO100 (long exposure), print 20x30", sharp in center, distracting fuzz + CA in corners.
- K200D, DA 18-250 @ 35mm, ISO 800, print 20x30", sharp in center, bits of softness visible in corners, but CCD noise limits overall image crispness.
- K200D, DA 18-250 @ 135mm, f8, ISO200, print 20x30", sharpness in center, visible fuzz at corners and the 4 edges of the frame (lens is soft at 135 , except decently sharp in center)

With mediocre lens, the 3:2 aspect ratio enlargement can be enlarged the same as center square crop, simply due to edges and corners limiting the enlargement.
With edge to edge sharp lens, same camera, image print can be enlarged 1.5x as much as same shot taken with low end not corner to corner sharp lens.
So , the lens is big deal to such an extent that you could print larger from a 24Mp camera and sharp primes, than from a 50Mp camera with an entry level zoom not used at it's maximum optical performance.
Up-sampling prevent pixelation, but doesn't help solve lens resolution drop from center to corners.
Forum: Pentax K-1 05-05-2020, 01:48 PM  
Pixel Shifted Images
Posted By MJKoski
Replies: 1,391
Views: 168,062
Sand Trails. Rare phenomenon in which gusts of wind move light grasses on a sandy beach around their roots and circular motion draws a circle during few hours.

The circle is very faint usually and requires some effort and patience to find. Image taken with full-spectrum K-1, Zeiss 50MP and 850nm IR-filter with some brownish sandy tone added in post.
Forum: Pentax K-1 05-05-2020, 05:41 PM  
Post your K-1 pictures!
Posted By Aaron28
Replies: 30,514
Views: 2,752,767
3 frame pano….K-1...FA77...af540fgz

Forum: Pentax K-1 04-15-2020, 12:19 AM  
Post your K-1 pictures!
Posted By 5r82
Replies: 30,514
Views: 2,752,767
K 1 + M 135 3.5

Forum: Pentax K-1 04-10-2020, 11:06 AM  
Post your K-1 pictures!
Posted By fs999
Replies: 30,514
Views: 2,752,767
FF Mode • 1600 ISO • Pentax F 50mm F1.7

FF Mode • 100 ISO • Pentax FA 35mm F2 AL
Natural Park • Madeira

FF Mode • 100 ISO • Sigma Art 18-35mm F1.8 DC HSM
Colmar • Haut-Rhin • Alsace • France
Forum: Post Your Photos! 04-03-2020, 07:11 AM  
People 2020
Posted By Drinkkeri
Replies: 8
Views: 965
For April; Tellervo mother of herd and keeper of fields
Forum: Pentax K-1 03-29-2020, 04:58 PM  
Post your K-1 pictures!
Posted By northcoastgreg
Replies: 30,514
Views: 2,752,767
Along the Apache Trail, with the FA 43:

Forum: Pentax Medium Format 03-26-2020, 08:35 PM  
Post your medium format photos!
Posted By TDvN57
Replies: 15,307
Views: 2,552,374
With all this social distancing and what-not, I'm sharing some pictures I took on a trip to Namibia last year. Planning to go back this year, but our flights may not exist anymore :-(

Enjoy these and comments are welcome.

This picture of the whale breaching was taken with my KP (did not have the 645 with me on the boat)

The world is truly beautiful. Hope we can keep it that way.
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