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Forum: Monthly Photo Contests 03-04-2020, 11:14 PM  
After Rain
Posted By bc_the_path
Replies: 4
Views: 119
The bark of a birch tree minutes after rain. Minimal post processing.
Forum: Monthly Photo Contests 03-04-2020, 01:11 PM  
February 2020 Photo Contest
Posted By bc_the_path
Replies: 30
Views: 637
I would like to nominate this photo
Forum: Winners' Showcase 03-04-2020, 01:10 PM  
February, 2020 Winner: The Struggle, Ambleside
Posted By bc_the_path
Replies: 54
Views: 1,253
I would like to nominate this photo
Forum: Monthly Photo Contests 03-04-2020, 01:08 PM  
Superstitions Rising
Posted By bc_the_path
Replies: 11
Views: 319
I would like to nominate this photo
Forum: Monthly Photo Contests 03-04-2020, 01:08 PM  
Winter in Alaska
Posted By bc_the_path
Replies: 14
Views: 234
I would like to nominate this photo
Forum: Monthly Photo Contests 03-04-2020, 01:08 PM  
Dresden Heath on a tranquil morning in August (b/w)
Posted By bc_the_path
Replies: 7
Views: 225
I would like to nominate this photo
Forum: Monthly Photo Contests 02-02-2020, 01:31 AM  
Posted By bc_the_path
Replies: 67
Views: 1,104
I would like to nominate this photo
Forum: Monthly Photo Contests 02-02-2020, 01:31 AM  
still life with fruit
Posted By bc_the_path
Replies: 66
Views: 1,114
I would like to nominate this photo
Forum: Monthly Photo Contests 02-02-2020, 01:30 AM  
Posted By bc_the_path
Replies: 57
Views: 847
I would like to nominate this photo
Forum: Sold Items 06-23-2012, 12:46 PM  
For Sale - Sold: Pentax FA 28-70mm f/4
Posted By bc_the_path
Replies: 8
Views: 3,225
I like this lens a lot and use it on three bodies (OK, not at the same time!). You can see a relatively high ISO image of our restless dog Pebble in World Pentax Day Gallery. It was taken using this particular lens (instead of a dozen others!). I fully recommend it...
Forum: Pentax SLR Lens Discussion 05-02-2012, 01:37 PM  
Best 135mm manual lens
Posted By bc_the_path
Replies: 31
Views: 21,616
Just to confuse followers of this thread (!), I would like to mention Jupiter 37A, an M42 Soviet lens (135mm f/3.5) which is said to share its formula with a Leica of the same length. My copy turned out to be a lot better than the ones I compared it (a Takumar and a Pentacon). It is MC and sharp wide open. The rendering of out of focus highlights is simply beautiful. I am planning to test it against my DA Star 50-135mm (with dead SDM) at 135mm. It sure is going to be an unfair test; I just don't know unfair for which!!!
Forum: General Talk 07-06-2011, 12:12 AM  
New PF Look: A sneak preview!
Posted By bc_the_path
Replies: 88
Views: 14,155
The best thing about the change is larger fonts, I believe.
Anxious to see it online :)
Forum: Pentax K-5 04-16-2011, 01:34 PM  
What's wrong with my k-5 raw images?
Posted By bc_the_path
Replies: 56
Views: 9,126
>There's no front focus issue that I know of.
Then, how do you explain that in your original K5 shot the eyebrows are sharper than the eyelashes (UNLIKE those in the K-x image)?
Forum: Pentax K-5 04-16-2011, 12:56 PM  
What's wrong with my k-5 raw images?
Posted By bc_the_path
Replies: 56
Views: 9,126
I do not understand why you don't see the point.
If you are interested in the "look" of K5 images; shoot an eye at f/8 and examine (pixel-peep) the image. If you are not interested in whether the shallow DOF (combined with some FF) is effecting the sharpness of your images; why are you shooting wide open?
Forum: Pentax K-5 04-16-2011, 12:30 PM  
What's wrong with my k-5 raw images?
Posted By bc_the_path
Replies: 56
Views: 9,126
Your K5 is front focusing.
Just look at the eyebrows; they are sharp in your second photo and blurry in your first...
Must be very easy to adjust.
Forum: Sold Items 03-09-2011, 11:57 AM  
For Sale - Sold: Super-Takumar 55mm f/1.8 M42 (US/CAN)
Posted By bc_the_path
Replies: 8
Views: 4,993
A free bump!
This is a must especially for those who have only the kit lens covering this range. The performance of this lens is simply uncomparable. Not only it is fast and sharp, it also produces a very pleasing bokeh. I love mine (and, have a few other primes at this range!).
Forum: Digital Processing, Software, and Printing 03-02-2011, 01:58 PM  
Curve transfer for RAW. Is there such a thing?
Posted By bc_the_path
Replies: 0
Views: 1,943
I understand that a raw developer software works like the clasical darkroom "developer" (solution). There are different varieties producing different outputs from the same negative/raw file. In the film days, companies (like Kodak) used to suggest their own developers for their films. However, experienced photographers have always used their favorite film with their favorite developer without necessarily taking those suggestions into account.

Pentax suggests Silkypix to develop their raw files.

Let us say, I like the look of the raw files developed by Siykypix.
And, let us assume that I happen to like Brand X Raw Developer, which is very good in certain regards. However, "the look" of the developed file (jpeg or otherwise) is not that good.

We know that raw developers apply a curve to the raw data and, like chemicals used in the film days, these curves result in different looks.

My question is this:
Is there a practical way (other than trial and error) to use/copy/replicate the effect of a curve of, say, Silkypix for another raw developer? Or, the curves are hidden, embedded, protected etc.?
Forum: Pentax News and Rumors 01-27-2011, 02:58 PM  
Many K-5s are on their way back home!
Posted By bc_the_path
Replies: 1
Views: 3,758
The Turkish representative of Pentax (Nar Teknoloji) today released a statement which can be summarized as below (they are still to sell their very first "legally imported" K-5 here):
- There is a delay in the customs (which may have nothing to do with Pentax or its representative, by the way).
- The cameras were inspected while they were waiting for customs procedures to complete. Unfortunately, most of them had the sensor stain problem.
- The representative decided to send them back to Pentax Europe and the few remaining ones with good sensors will be used as samples for the press when the procedures are complete.
- Those who want to buy a K-5 from the local markets should wait for some time.

It seems plausible that others are also returning units back as well. I guess the recent signs of shortage of K5s in certain markets may have something to do with Pentax busy replacing the faulty sensors.
Forum: Pentax K-5 01-14-2011, 01:20 PM  
Relevant news re malfunctioning AF under artificial light
Posted By bc_the_path
Replies: 752
Views: 106,136
Well, this is no "news"; but I have a theory after reading many of the comments about FF with especially screw driven lenses under low light.

My reasoning follows these lines:
- Pentax is no new player in this AF business.
- Pentax has other cameras (functioning properly) with this same hardware.
- Pentax has certainly tested the prototype under low light conditions; as this was meant to be a selling point.
- The range of AF adjustment by the user is insufficient to correct the problem.

Here is my conclusion:
The placement / alignment of the low light AF sensor is faulty.
And, this must be a workmanship and QC issue.
I believe this can conceivably be due to a component being slightly thicker or thinner than the specification (can be about 50-100 micrometers). This results in a misplaced sensor.

Of course lacking ;)
However, my recent attempt at buying a K5 has just failed because the seller told me that he could not find a new unit for shipment! Could this be a potential proof?

Bad news?
If my reasoning and *guess* is correct, no firmware fix can resolve the issue. (Yet, all K5s are still under warranty).

Good news?
The issue is resolvable and people with "proper" K5s are going to be very happy owners!
Forum: Pentax Camera and Field Accessories 01-11-2011, 03:04 PM  
Tenpa Magnifier
Posted By bc_the_path
Replies: 25
Views: 15,342
Just for the record:
Nikon DK-21M eyepiece magnifier (approx. x 1.2) is almost the same (optically) as the original Pentax piece (O-ME53); only cheaper (less than half the price of the Pentax part)!
I have been using it for the last couple of years on K10D and K20D. It magnifies just a bit but that certainly helps. I believe it fits on practically all Pentax DSLRs.
Forum: Pentax SLR Lens Discussion 12-22-2010, 04:29 AM  
What causes backfocus or frontfocus?
Posted By bc_the_path
Replies: 19
Views: 6,187
There is also the "aperture value" of the focusing elements. Like lenses, a wide aperture system is more expensive. A narrow aperture system is easier to build and cheaper. Used along with "like" lenses the (inevitable) focus errors are not obvious as DOF is big enough to hide them. The errors usally become a problem when we try to focus using a narrow aperture system (say, f/5.6) with a tele lens at f/2 or so.
Hunting happens when the focus sensor "notices" that the change in positions of the elements produce a poorer contrast.
All the arguments aside, I do not understand why focus adjustment is possible only in the higher end DSLRs. It is a must especially for wide aperture lenses, anyway...
Forum: Pentax SLR Lens Discussion 12-22-2010, 02:31 AM  
What causes backfocus or frontfocus?
Posted By bc_the_path
Replies: 19
Views: 6,187
I see the readers fail to realize that this is more a "mechanical" rather than an optical phenomenon.
The focus sensor and its chip decides that "it is OK" when they sense maximum contrast (or, whatever). Then, the chip sends a signal to the moving parts (outside the sensor, mechanical) to "stop". Every lens (depending on age, brand, focal length, local temperature etc.) reacts just a tiny amount differently. The mechanism comes to a stop "after" a while, where the focused point may no longer be "exactly the same" as that was found good by the sensor&chip. This may or may not alter the focus point noticeably and consistently. Adjusting for back focus and/or front focus can be talking specifically to that lens to account for the delay in its response. If the camera side is weak/faulty/problematic, than you adjust for the camera. Of course, an occasional problem can be out of reach of the supplied adjustment tolerances and sevice may be needed.
The focusing screens of our DSLRs are of no help in showing us the differences in focus resulting due to these events. There are "optical" reasons for that.
Does your car stop the moment you hit the brake?
Forum: Pentax SLR Lens Discussion 12-21-2010, 09:17 AM  
What causes backfocus or frontfocus?
Posted By bc_the_path
Replies: 19
Views: 6,187
As far as I understand, some degree of unwanted movement is inevitable in any two (or more) mechanically coupled moving parts. Stopping one, for example, stops the other only after some time. The more parts the system has the more difficult it is to 'standardize' the potential errors. Also, cheaper, poorly made systems has more "leeway". This resembles, more are less, the situation with the steering wheel of the cars. It is "normal"to have some movement of it, "before" you move the wheels.
Forum: Post Your Photos! 12-12-2010, 03:40 PM  
Macro A Single Lemon Blossom
Posted By bc_the_path
Replies: 6
Views: 1,305
This is almost perfect except, perhaps, for the bright right upper part.
Forum: Post Your Photos! 12-12-2010, 03:38 PM  
Abstract The Yellow Block & The Dog
Posted By bc_the_path
Replies: 0
Views: 1,106
A rather remote allegory of the first part of Kubrick's "2001 Space Odyssey".
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