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Forum: Pentax Lens Articles
07-07-2008, 02:50 PM
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Hi everybody,
I would like to open up a thread dedicated to one topic:
DA lens on Full Frame: a sticky test shots thread.
This thread shall be dedicated to test shots of a DA lens mounted to a full frame body (e.g., a film camera body). By test shot, I mean shots dedicated to evaluate the performance. Shots of ordinary subjects aren't suitable to this task, normally, and should not be posted. So, these are the rules:
- K mount lens dedicated to the APS-C form factor is used.
- Image is taken full frame 36mm x 24mm.
- Lens hood was removed.
- And ideally, no filter is mounted.
- The aperture used is specified (note that film cameras don't record EXIF...).
- Sample image shows the entire field of view.
- Sample image(s) show(s) corner, border and center performance at 10MP-100% (multiple crops, or single not-resized image).
- The subject is such that resolution and vignetting at the borders can be compared to the center.
The idea behind this thread is obvious: To compile enough data to assess the spectrum of available lenses for a forthcoming full frame DSLR in K mount.
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Table of results as obtained in this thread (updated regularly):SMC Pentax-DA primes...
SMC Pentax-DA zooms...
- DA 10-17mm F3.5-4.5 Fish-Eye ED [IF]: FE, see #59, #61, #94. 10mm: heavy vignette / 14mm: almost no vignette / 17mm ++ (Reps, froeschle, Gooshin)
- DA 12-24mm F4 ED AL [IF]: - (below 16mm, xitek.com), o (at 18mm, architorture), + (at 20mm, architorture), ++ (at 24mm, architorture)
- DA 16-45mm F4: - (below 21mm, Nesster)
- DA* 16-50mm F2.8 ED AL [IF] SDM: - (xitek.com)
- DA 17-70mm F4 AL [IF] SDM: - (KjetilH)
- DA 18-55mm F3.5-5.6 AL: - (at 18mm, Spongefingers; below 23mm, xitek.com)
- DA 18-55mm F3.5-5.6 AL II: missing
- DA 18-250mm F3.5-6.3 ED AL [IF]: - (xitek.com)
- DA 50-200mm ED: -
- DA* 50-135mm F2.8 ED [IF] SDM: - (elho_cid)
- DA* 60-250mm F4 ED [IF] SDM: ++ (officially rated "designed for FF" by Pentax patent US7489452) probably good on full frame but evaluation still missing; the rating is +++ with a baffle modification, + without)
- DA 55-300mm F4-5.8 ED: 0 (+, ++ at tele end, viking79)
Sigma K mount DC...
- Sigma 18-200mm f/3.5-6.3 DC: -
- Sigma 10-20mm f/4-5.6 DC: - (below 14mm, Gooshin)
- ...
Tamron K mount Di-II...
Overall rating scale:
+++: no significant difference between APS-C and FF corners
++: difference but usable at full aperture with a small loss in corner IQ only
+: usable staring at f/4~f/5.6, with no or a small loss in corner IQ only
o: usable at f/11 or with big loss in corner IQ only
-: not usable
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Forum: Lens Clubs
07-04-2023, 06:53 AM
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A few recent pictures. K3iii/Sigma 800mm F5.6 APO EX.
 Hare by Gary Chalker, on Flickr
 Hare by Gary Chalker, on Flickr
 Hare by Gary Chalker, on Flickr
 Hare by Gary Chalker, on Flickr
K3iii/FA*600mm F4 ED[IF].
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Fox by Gary Chalker, on Flickr
 Green Woodpecker male by Gary Chalker, on Flickr
 Fox and Cubs by Gary Chalker, on Flickr
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Forum: Lens Clubs
07-04-2023, 06:33 AM
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Poppies by Jason Doss, on Flickr
Pentax K-1 mII and K400-600 Reflex Zoom at 500mm, f10, 1/750s, and ISO 1600
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Forum: Lens Clubs
05-03-2018, 06:29 AM
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A Purple heron with a happy face after catching a fish :D
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Forum: Lens Clubs
05-02-2018, 05:39 PM
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K-3 and Tamron 300 2.8 with Pentax HD DA 1.4 TC.
Anyway, the migration continues, birds are headed on their way north to their breeding territories. For days there were a few Red Winged Blackbirds hanging out with the grackles. Today most of the grackles were gone , there were a few left hanging out with the Red Winged Blackbirds.
A straggling Grackle....
 2018-05-01-Feeder-creatures-5 by Norm Head, on Flickr
 2018-05-01-Feeder-creatures-6 by Norm Head, on Flickr
One of the (probably immature) Red Winged Blackbirds
\ 2018-05-01-Feeder-creatures-2 by Norm Head, on Flickr
New yesterday, 3 or 4 female Redwinged Blackbirds
 2018-05-01-Feeder-creatures-3 by Norm Head, on Flickr
These guys stop in for a few days spring and fall. There were three last fall, I've just seen one come back to date, a fox sparrow.
 2018-05-01-Feeder-creatures-9 by Norm Head, on Flickr
 2018-05-01-Feeder-creatures-10 by Norm Head, on Flickr
The latest arrival before yesterday, the White Throated sparrows, who've been here about a week, and who's calls fill the woods when you walk. A whole flock must have arrived.
 2018-05-01-Feeder-creatures-11 by Norm Head, on Flickr
One of the American Tree Sparrows who stayed the winter, still hanging around.
 2018-05-01-Feeder-creatures-4 by Norm Head, on Flickr
And also one of the 4 or 5 Dark Eyed Juncos left rom the 40 that wintered with us.
 2018-05-01-Feeder-creatures-1 by Norm Head, on Flickr
And of course, our contingent of rodents.
 2018-05-01-Feeder-creatures-7 by Norm Head, on Flickr
 2018-05-01-Feeder-creatures-8 by Norm Head, on Flickr
 2018-05-01-Feeder-creatures-12 by Norm Head, on Flickr
 2018-05-01-Feeder-creatures-13 by Norm Head, on Flickr
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Forum: Lens Clubs
05-02-2018, 10:16 AM
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You're already convinced to leave abandoned eggs where they lie, but I doubt the female moved it out. I suspect she was just careless once when laying.
Bird-ecdote, hopefully pictures will follow. I set up early today at the edge of a pond & swamp where a couple days back we spotted a pair of Canada geese with new chicks. They never showed up, but while waiting (eventually for two hours) I spotted two dark, black birds fighting in a dead tree that was standing in the water a long way off on the far side of the pond. As I swung the big lens around to see if I could capture anything, they fell fighting into the water amid a little bit of debris, a few floating branches. It was a pair of grackles, and the one was definitely getting the better of its opponent. It looked as though the c-b was deliberately trying to push the other bird below the water, and certainly it did so time after time. Eventually the dominating bird flew back up to a branch and shook the water out of its feathers, and the other tried to extract itself from the water, but it was having a hard time. Then the first bird, seeing the struggling, flew back down and renewed its attack, again seemingly trying to push the other grackle under water (probably the same kind of thing it would have done on land). The winning bird left again, and losing grackle renewed its efforts to get out of the water, but it failed, again and again, its feathers too water-logged for flying. It was obviously tiring. Eventually it gave up, and drowned:eek::(!
MUST CORRECT AN ERROR, and have done so in the description above. Now that I've looked at, enlarged and cropped the images it's clear (as clear as a deep crop from a zoom set @ 600mm can be) that both birds were grackles, so the cowbirds are off the hook.
Two images of the birds fighting, mostly the winner. atop, is visible.
The loser swimming away and simultaneously trying to get into the air. It never got more than about half its body out of the water.
The loser dying. A few seconds later the wing (or tail?) dropped into the water so only a black lump was visible.
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Forum: Lens Clubs
04-27-2018, 07:29 AM
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Scan from a chrome, original probably taken in early 90's and probably with a Sigma 300mm f4 APO Macro. Evening light gave a golden glow, which depending on your taste is either pleasing or the wrong colors.
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Forum: Pentax K-01
02-19-2017, 03:49 AM
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Pentax K-01 + Sigma 35 A
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Forum: Lens Clubs
12-01-2016, 07:54 PM
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The Alaska Railroad depot at Denali National Park. Looks like I was the first human to visit that day.
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Forum: Lens Clubs
11-11-2016, 11:43 PM
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Here's a few shots with the K5 IIs and Sigma 10-20 F3.5 from my latest journey.
Tatahatso Point - Navajo Nation
Horseshoe Bend
Point Sublime - Grand Canyon National Park
Point Sublime - GCNP
Point Sublime - GCNP
Son-of-a-bitch Point - Grand Canyon National Park
Twin Point
Havasupai Point - GCNP
Tatahatso Point - Navajo Nation
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Forum: Lens Clubs
02-23-2016, 09:42 AM
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I woke up early today and decided to check the lake nearby behind the chain store. So many birds, but so many clouds, it was not the best morning for shooting. Anyway, just a few from today.
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Forum: Lens Clubs
08-16-2015, 04:47 PM
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A plot being hatched.
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Forum: Lens Clubs
06-18-2015, 07:06 AM
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Some holiday photos.......
USA road trip. Round trip from San Francisco through Big Sur, LA, San Diego, Scottsdale, Sedona, Grand Canyon, Lake Powell, Monument Valley, Moab, Bryce Canyon, Zion NP, Las Vegas, Death Valley NP, Yosemite NP, Napa Valley and back to SF.
Pentax K3 with Sigma 10-20mm f4-5.6
 Baseball. by wherewerewe91, on Flickr
 Big Sur I. by wherewerewe91, on Flickr
 Grand Canyon I by wherewerewe91, on Flickr
 Grand Canyon II by wherewerewe91, on Flickr
 Grand Canyon III by wherewerewe91, on Flickr
 Antelope I by wherewerewe91, on Flickr
 Antelope II by wherewerewe91, on Flickr
 Horseshoe Bend by wherewerewe91, on Flickr
 Monument Valley by wherewerewe91, on Flickr
 Stars by wherewerewe91, on Flickr
 Pine Tree Arch by wherewerewe91, on Flickr
 Hoodoos II by wherewerewe91, on Flickr
 Glacier Point by wherewerewe91, on Flickr
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Forum: Lens Clubs
01-19-2015, 04:33 PM
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Really great shots everyone.
I had another go at shooting Short Eared Owls today, K-5/Sigma 500mm f4.5 EX DG
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
 Short Eared Owl by Gary Chalker, Thanks for over a 1,000000 views, on Flickr
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Forum: Lens Clubs
01-18-2015, 07:23 PM
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Forum: Lens Clubs
01-16-2015, 10:11 PM
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This is my first post in what I consider to be the most dangerous place on PentaxForums-good long glass is $$$$. I'm starting out on training wheels, with a DA 55-300mm HD WR used with a K-5, K-3 and Q7. Here are some shots with the K-5/K-3:
House Finch, Male by john m flores, on Flickr
House Finch, Female by john m flores, on Flickr
White-breasted Nuthatch by john m flores, on Flickr
European Starling, Adult transitional by john m flores, on Flickr
And here are some shots with the Q7:
House Finch, Female by john m flores, on Flickr
Savannah Sparrow by john m flores, on Flickr
Snowy Owl Scans by john m flores, on Flickr
Snowy Owl takes flight by john m flores, on Flickr
The Q7 shots are noticeably softer but I've still got to practice and maybe also accept the fact that I've got to trade in the monopod for a tripod in the field. Or I should just suck it up and get the DA300 + TC.
See, I told you this place was dangerous!
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Forum: Lens Clubs
01-11-2015, 04:34 PM
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Well I will be back to the snow in a couple of days.
Costa Rica has been amazing and I saw more wildlife the I imagined and all of it was in the wild.
A few more.
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Forum: Lens Clubs
09-29-2014, 10:40 AM
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Forum: Lens Clubs
09-29-2014, 10:43 AM
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I'm using a lowepro slingshot 100 - its a good size for the lens. But I had a similar experience! Just got to be religious about pulling the zip pulls right round to the end of the zipper not leave them in the middle somewhere because they WILL come undone with the weight of the lens
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Forum: Lens Clubs
09-29-2014, 10:50 AM
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I use the Lowepro Flipside 400AW. It accommodates my A*300/2.8 with the AF1.7X TC and K-5 attached.
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Forum: Pentax K-01
07-10-2014, 06:57 AM
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Forum: Lens Clubs
04-13-2014, 04:16 PM
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Hey LeRolls,
Both of those were the K5ii @ ISO400 and f/1.8.
Here are a couple from the 31 that same night.
Bonus 77 pics!
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Forum: Pentax SLR Lens Discussion
03-27-2014, 08:41 PM
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Did somebody say Bokeh?
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Forum: Lens Clubs
09-04-2013, 02:28 AM
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