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Forum: Lens Clubs 08-07-2016, 07:36 PM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
It's like crickets in here...

FA 85

Lexi's Hideway by Christopher Rankin, on Flickr

Nat by Coral Cove by Christopher Rankin, on Flickr

Nikki at Sunset by Christopher Rankin, on Flickr
Forum: Lens Clubs 07-26-2016, 07:38 AM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
Forum: Lens Clubs 07-24-2016, 06:12 AM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
FA 85

Grab the Light by Christopher Rankin, on Flickr
Forum: Lens Clubs 07-23-2016, 08:04 AM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
Forum: Lens Clubs 07-17-2016, 07:42 PM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
Forum: Lens Clubs 07-24-2016, 11:44 PM  
F* & FA* club!
Posted By LeRolls
Replies: 862
Views: 187,567
Forum: Pentax K-1 07-23-2016, 08:01 AM  
Post your K-1 pictures!
Posted By LeRolls
Replies: 30,771
Views: 2,788,321
I think I agree as well.

FA 85

Yesenia on a Wooden Pallet by Christopher Rankin, on Flickr
Forum: Pentax K-1 07-22-2016, 05:48 AM  
Post your K-1 pictures!
Posted By Rondec
Replies: 30,771
Views: 2,788,321
I just got the DFA 15-30. I really am impressed by its flare resistance. Not DA 15 level, but still pretty good.

This is a sunrise shot with it...

Sunrise by Vincent1825, on Flickr

Eden (with the FA 77)

Eden by Vincent1825, on Flickr
Forum: Pentax K-1 07-21-2016, 10:35 AM  
Post your K-1 pictures!
Posted By fs999
Replies: 30,771
Views: 2,788,321
1. Crop Mode • 100 ISO • Sigma Art 18-35mm F1.8 DC HSM


2. FF Mode • 100 ISO • Pentax DA* 200mm F2.8 ED SDM


3. Crop Mode • 200 ISO • Pentax DA* 200mm F2.8 ED SDM


4. Crop Mode • 100 ISO • Sigma Art 18-35mm F1.8 DC HSM
Forum: Pentax K-1 07-21-2016, 07:14 AM  
Post your K-1 pictures!
Posted By LeRolls
Replies: 30,771
Views: 2,788,321
FA31

Since all the models are either on vacation, sick, or busy I figured I go back to landscapes for a bit. A lovely excuse to play with my newly acquired K-1 and a chance to breathe life back into my 31. I absolutely love the adjustable screen!

Sunrise Ahead by Christopher Rankin, on Flickr
Forum: Pentax K-1 07-21-2016, 05:48 AM  
Post your K-1 pictures!
Posted By ranchy
Replies: 30,771
Views: 2,788,321
Recent Studio shot. Trying K-pop style...

K135 F2.5
Collage of the images:



Which style/heart you prefer...

Forum: Pentax K-1 07-29-2016, 07:00 AM  
Best wide angle lens for K-1?
Posted By Sandy Hancock
Replies: 409
Views: 75,844
I have returned from my trip around England and Ireland, and the DFA15-30 got an absolute hammering. Yes, it's big, and heavy, and doesn't take filters, but it just kept producing excellent images.


Cloisters


The Great Hall


Soft and hard


Sunset in Marazion


The guardian of the circle


Stonehenge 3


Pulteney Bridge, Bath


Ford 2


Footings


Arrival


Castle and steeple


Family plot


Trinity library 2
Forum: Pentax K-1 07-18-2016, 12:58 AM  
Post your K-1 pictures!
Posted By ddamski
Replies: 30,771
Views: 2,788,321
2x converter A 2X-S with DA*300 and pixelshift
Moon by David Damaskinos, on Flickr

and one with the A* 85mm @ 1.4

flower fields by David Damaskinos, on Flickr
Forum: Pentax K-1 05-17-2016, 12:28 AM  
K-1 camera porn
Posted By kain
Replies: 161
Views: 34,340
I hear someone wanted to see the K-1 with a 31 mounted?
Forum: Pentax K-1 07-16-2016, 11:17 AM  
Post your K-1 pictures!
Posted By fs999
Replies: 30,771
Views: 2,788,321
Crop Mode • 100 ISO • Pentax DA* 55mm F1.4 SDM • Kenko Pz-AF UniPlus Tube 25 • Metz Flash 52 AF-1 Digital with Ray-Flash universal L ring


Crop Mode • 100 ISO • Soligor C/D Wide-Auto 20mm f:2.8


FF Mode • 100 ISO • Sigma Art 18-35mm F1.8 DC HSM


FF Mode • 100 ISO • Soligor C/D Wide-Auto 20mm f:2.8 • HDR 3 photos (-2, 0, +2 EV) fused with Photomatix 5.1.3
Forum: Pentax K-1 07-16-2016, 09:19 AM  
Post your K-1 pictures!
Posted By vcollerp
Replies: 30,771
Views: 2,788,321
Forum: Pentax K-1 07-07-2016, 12:50 PM  
Post your K-1 pictures!
Posted By Blythman
Replies: 30,771
Views: 2,788,321
Giving the K-1 its second outing this morning, with the DA560mm. Visited our local Great Crested Grebes before I went to work.
There are various theories on why grebes eat feathers. One is that they form a partial plug between the stomach and small intestine, which acts as a strainer to keep fish bones in the stomach long enough to be completely digested.
The eggs have hatched one a day for the last 3 days. I wonder if egg number 4 hatched after I left this morning.
Full exif available if you click through to Flickr version.

Great Crested Grebes (1 of 5) by Alan Wennington, on Flickr

Great Crested Grebes (2 of 5) by Alan Wennington, on Flickr

Great Crested Grebes (3 of 5) by Alan Wennington, on Flickr

Great Crested Grebes (4 of 5) by Alan Wennington, on Flickr

Great Crested Grebes (5 of 5) by Alan Wennington, on Flickr
Forum: Pentax K-1 07-04-2016, 02:11 PM  
Post your K-1 pictures!
Posted By colodion
Replies: 30,771
Views: 2,788,321
A few macros, you libelulas spawns

_IMG7451 by Pablo Colodion, en Flickr

_IMG7294 by Pablo Colodion, en Flickr

_IMG7457bb by Pablo Colodion, en Flickr

_IMG7398 by Pablo Colodion, en Flickr
Forum: Pentax K-1 06-28-2016, 12:12 PM  
Post your K-1 pictures!
Posted By blan01
Replies: 30,771
Views: 2,788,321
Took a short trip to NYC last weekend

_IMG1823

_IMG2019

_IMG1790

_IMG1955
Forum: Pentax K-1 06-27-2016, 01:33 AM  
Post your K-1 pictures!
Posted By sunCrm
Replies: 30,771
Views: 2,788,321
100 Macro WR :









FA35:



F 70-210:

Forum: Pentax K-1 06-25-2016, 07:15 PM  
Post your K-1 pictures!
Posted By chuck_c
Replies: 30,771
Views: 2,788,321
Last night through the window of an antique store with the FA 43 Ltd


Porcelain grape maiden
by Chuck Campbell, on Flickr


Crystal reflections
by Chuck Campbell, on Flickr


After hours snack
by Chuck Campbell, on Flickr


Reflecting on reflections
by Chuck Campbell, on Flickr
Forum: Pentax K-1 06-25-2016, 08:20 AM  
Post your K-1 pictures!
Posted By Stickl
Replies: 30,771
Views: 2,788,321
I took some graduation photos for my friend! DA* 55/1.4 (in FF-mode). All photos taken in daylight without any flash(es).























Forum: Pentax K-1 06-24-2016, 09:14 AM  
Post your K-1 pictures!
Posted By johnmb
Replies: 30,771
Views: 2,788,321
Here's a recent portrait of a young boy using this lens. Regards, johnmb
Forum: Pentax Full Frame 06-21-2016, 01:52 PM  
New glass - old glass. Which lenses should Pentax revisit?
Posted By Paul MaudDib
Replies: 204
Views: 22,327
Even Pentax is still using the Planar as a base. Every 50/1.4, 50/1.8, 50/2, 55/1.8, or 55/2 lens is a Planar at its heart. Pentax used to have some other designs back in the Asahiflex days - the 58/2.4 was a Heliar type and the 58mm f/2 was a Sonnar type.

The fact that coatings were finally coming of age was a major reason why the other types died out. They had fewer air-glass interfaces and so tended to flare less and lose less contrast. Once coatings fixed this problem with the Planar's many air-glass interfaces they faded away.

They seemed to work particularly poorly as SLR lenses, as there are some rather good Heliar and Sonnar lenses for rangefinders and LF cameras.



A lot of the modern lenses are essentially direct descendents of the film lenses, sometimes with few changes other than slapping a screwdrive on the focus mechanism. There would probably be some tweaks, but also probably less than you would expect.

Really that's been the story thoughout the process of lens development. What happens when you split the triplet's rear element into a doublet? Why, that's a Tessar. Replace the triplet's single front and rear elements with doublets? Well, that's a Heliar. Lens design has some specific rules and the modifications that can be made are pretty straightforward. There's a fantastic chart of the various lens families somewhere on MFLenses, but I can't seem to dig it up.

You can go hog wild and computer-optimize radical new lenses, but people don't seem to like that. If you want it, just buy Sigma.

---------- Post added 06-21-2016 at 05:04 PM ----------



My understanding/theorycrafting here is that speed tends to introduce abberations. The faster you go, the farther you are away from a theoretically-perfect pinhole aperture. Similarly, going farther away from a normal lens tends to be trickier too.

You have a certain number of element surfaces that you can use to focus the light. When you use your element surfaces to try and intensify the light or bend some insane field-of-view onto the film, you can't spend them correcting abberations as easily. So the slower lenses have less abberations to correct and more ability to correct them. Obviously, more elements gives you more ability to bend the light, but increases weight, cost, and complexity. And even with Super-Multi-Coating, at some point you will start to lose some contrast and flare-resistance.

In particular the SMCT 35/2 and K35/2 and it just never seemed worth it. It's not that great wide open compared to modern lenses and you're giving up the incredible contrast/resolution of the f/3.5 lenses.

The K28/2 is a Distagon, it's supposed to be a very nice lens, it's just way too expensive for what it is. The P67 55/4 is also a Distagon and doesn't cost an arm and a leg. The K30/2.8 is also much more affordable.
Forum: Pentax K-1 06-14-2016, 01:00 AM  
Best wide angle lens for K-1?
Posted By NZ_Ross
Replies: 409
Views: 75,844
A while ago I made a list of every tilt shift lens I could find that was available for Pentax K mount.

The list is below, I hope this helps your deliberations

Ross
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