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Forum: Pentax Price Watch 12-29-2019, 05:56 AM  
X-Rite free On1 software offer ends 12/31 plus $15 rebate on the Passport 2
Posted By ppohja
Replies: 6
Views: 422
Maybe worth mentioning it's available only in Canada and the US.
Forum: Pentax Price Watch 05-29-2019, 02:22 AM  
Odd pentax 67 200/4 AERO Lens
Posted By ppohja
Replies: 10
Views: 1,066
Seems to have resurfaced again.

Should it, and the known information be added to our database?
Forum: Pentax Medium Format 04-01-2019, 12:47 PM  
Selection Dilemma: Pentax SMC FA 645 200mm f4 OR MC Carl Zeiss Jena Sonnar 180mm f2.8
Posted By ppohja
Replies: 14
Views: 1,960
I have been using the Sonnar on K1. If I were in your situation, I would choose Pentax own lineage - all the stuff with adapters, manual focus, manual metering ... Not worth the effort if not specifically looking for the look Sonnar provides.

I.e. if you need to ask, then go FA.
Forum: Pentax SLR Lens Discussion 03-18-2018, 01:35 PM  
Anyone ever tried the 85mm F1.2 on a K-1?
Posted By ppohja
Replies: 6
Views: 1,497
EXIF says its Canon? Anyways, this one kicks ass.
Forum: Pentax K-1 03-18-2018, 01:32 PM  
K1 face detection in live view
Posted By ppohja
Replies: 6
Views: 1,502
There's a face detection in K-1? How can I turn it off?
Forum: Photographic Industry and Professionals 03-17-2018, 03:01 PM  
Should Pentax make a digital TLR ?
Posted By ppohja
Replies: 22
Views: 2,013
According to wikipedia, "Although the W1 got some considerably unfavorable reviews and some photography experts predicted a commercial failure, the W1 seems to have sold far over Fujifilms expectations.".

So already close to 10 yrs ago somebody were doing this and they were commercially happy.

However, this one, similarly to the 16-lens spider mentioned in this thread previously don't support the commercial perspective for the manufacturer to sell more lenses.
Forum: Photographic Industry and Professionals 03-11-2018, 01:38 PM  
Should Pentax make a digital TLR ?
Posted By ppohja
Replies: 22
Views: 2,013
Why these problems are not affecting phone makers?

Parallax errors can also be a benefit. In the old days, camera makers spent extra effort to design and manufacture beam splitters on front of the lens. Nowadays such Steritar seems to ask for close to 300$ on eBay.

It isn't that long time ago when the idea of taking 4 pictures and combining them in software was said to be a bad product idea, unnecessarily complex and anyways impossible because of moving targets changing location between shots would anyways ruin the picture.



Obvious. Just using the TLR name to give a connection of how could the thing look alike. A digital reincarnation clearly wouldn't just 1:1 copy the old concept.

Other usages could be e.g. sliding focusing - other lens takes the pic at f1.4 and the other f11 and then give a slider for defining the depth of field. Simplified light field.




SLR's got mirror moving, TLR's -- in the old times -- didn't.

A TLR with a swinging mirror to give both lenses light path to their corresponding sensors. Nobody has implemented this, but it still would be a TLR.
Forum: Photographic Industry and Professionals 03-11-2018, 08:04 AM  
Should Pentax make a digital TLR ?
Posted By ppohja
Replies: 22
Views: 2,013
Improved image quality.

Double the resolution or 8x resolution with pixel shift
Double the FPS (like gatling machine gun)
Improved dynamic range
New kind of bokeh effects



There's a reason why cell phone makers do it.
Forum: Photographic Industry and Professionals 03-11-2018, 07:40 AM  
Should Pentax make a digital TLR ?
Posted By ppohja
Replies: 22
Views: 2,013
Many phones nowadays are improving the image quality by actually having dual lenses on the main camera.

Could this idea be carried up to the SLR world? Business-wise, it would allow selling a second copy of every lens that people have already bought.

There was a patent describing some kind of film TLR, but maybe more traditional bird nest design would make more sense?

Should this happen, would it be Q mount or K mount?
Forum: Post Your Photos! 03-10-2018, 01:46 PM  
People Breanna
Posted By ppohja
Replies: 5
Views: 606
Cameras don't take pictures. Lenses do (with some help from the shooter).
Forum: Post Your Photos! 01-22-2018, 05:40 PM  
Landscape pic du midi 2
Posted By ppohja
Replies: 7
Views: 705
Not the place to make any camera comparisions .. but the first one shows really nice tonal separation. Doubling my previous thought about how would it look on a film camera.

The third one, gives the most detail. Interesting.. It's really the photographer, not equipment which makes the pic.
Forum: Post Your Photos! 01-22-2018, 05:29 PM  
Abstract french woman 5
Posted By ppohja
Replies: 11
Views: 1,196
Medium format always gives certain look. I wonder how these would look with the most traditional Pentax 645.. ?

The model is just as promised in the thread title -- I would love to get closer.
Forum: General Talk 12-14-2017, 01:52 PM  
Your latest de-acquisition
Posted By ppohja
Replies: 551
Views: 46,112
Bought a DA* 55mm, took one picture, wasn't happy with the result, so threw the camera and the lens down the rocky path that we were climbing. The camera survived with just few cracks to the housing, but the lens got its deserved destiny.

Look, here is the pic - autofocus zooming to the wrong eye and composition is all wrong.
Forum: Pentax K-30 & K-50 12-12-2017, 01:50 AM  
K-30 / K-50 Aperture Block Failue - Repair Solution available
Posted By ppohja
Replies: 885
Views: 162,676
I had a case similar symptoms as described here. The repairman said it was good enough just to clean the magnet. No change required. Now functioning perfectly.
Forum: Pentax SLR Lens Discussion 12-12-2017, 01:43 AM  
Macro lenses for landscape?
Posted By ppohja
Replies: 57
Views: 5,319
I remember when selling my M50/2.8 due to getting the A2.8 I ran through a number of tests with a number of lenses around the 50mm range.

I remember being disappointed looking at the D-FA 50 results at infinity compared to some others. Then thought, 'oh, this is a macro, never mind about the infinity'. Let's see if I can dig down the results, or redo something similar. Unfortunately currently I've got the same snowscape problem as the gentleman above.


One thing however is sure. The D-FA 50 is way better for about any of the use cases than my DA*55.
Forum: Flashes, Lighting, and Studio 11-16-2017, 08:35 AM  
HSS with trigger only signal (e.g. P67 + Cactus)
Posted By ppohja
Replies: 7
Views: 818
Okey, something along these lines was that I was looking for. Thanks!
Forum: Pentax News and Rumors 11-14-2017, 11:16 AM  
Mitakon Speedmaster 135/1.4 now for Pentax?
Posted By ppohja
Replies: 32
Views: 5,973
My thoughts exactly.

Often for club gig photography, 85/1,4 is a bad compromise - doesn't get close to the stage, but is way too portrait for the audience. Also it's often not big enough looking - having a hammerlens somehow frees up the space around.

Example pics from the preproduction version look OK.


I could use this one.
Forum: Product Suggestions and Feedback 11-13-2017, 12:40 PM  
Any chance for using flash in Pixelshift-mode by letting the flash fire like in HSS?
Posted By ppohja
Replies: 4
Views: 942
I've been struggling with a similar problem when wanting to use shutterless lenses.

My current line of thought is to use strobe mode flash and just manual trigger for each subsequent frame.

I'm having a Canon 550EX which allows setting the rate and number of flash firing. When pushing the test trigger (tried with both Cactus V5 and V6) using button continuously, the flash fires for the specified number of shots. I got a combination of 19 Hz and 50 flashes at the power level setting of 1/128. When going to 20Hz and over, the flash allows only 40 fires. As a note, Cactus RF60 also allows multi strobe, but does full multi strobe run with a single trigger signal.

Pixel shift seems to work on horizontal segments - if just popping the flash once at full power, the pixel shifted image receives exposure only on one segment. A bit similar to banding when going over camera's sync speed, however with pixel shift this happens with e.g. 1 second exposure time.

So the problem is finding the exposure settings where the flash is firing while the camera is going through all segments of each consequent exposure, as mentioned by the previous poster, preferably with constant power. Since doing the triggering manually for each pixel shifted frame if the fire rate * flash amount is too close to frame exposure time, it's difficult to time the shots to the right frame.

After some experimentation, with 1 second exposure time, 40 fires at 60 Hz rate seemed to give pretty even light distribution over the segments. This was 2/3 of the exposure time.

Few test shots with D FA 100mm macro and F 35mm-70mm F3.5-4.5. Both shot at f/11 near to closest focusing distance.


On pixel peeping, the pixel shift seems to give a bit more pop, maybe 10-15% more on the sharp areas. However, overall the pixel shifted image is clearly more pleasant to see, especially in the case of the zoom lens. This seems to support the theory that pixel shift gives relatively largest improvements when the lenses are not of the highest quality.

Can you see which one is pixel shifted and which one not?
Forum: Flashes, Lighting, and Studio 11-12-2017, 12:26 PM  
HSS with trigger only signal (e.g. P67 + Cactus)
Posted By ppohja
Replies: 7
Views: 818
Hmm, interesting..
Maybe I should say my real target, which is the old Graflex camera with a focal plane cloth shutter. Just used P67 as the example, as were in Pforums, heh. Thinking of how to combine flash with this guy. Its slowest time (largest simultaneous exposure to the film) is around 1/10sec, and now I'm thinking of is there a way to use modern flash with this.

The old timers used flash which burned for all the time. Maybe need to start hunting for some long-burning magnesium..
Forum: Sold Items 11-12-2017, 09:09 AM  
For Sale - Sold: Pentax-F 135mm f/2.8
Posted By ppohja
Replies: 54
Views: 7,483
Another? Didn't you already post it a bit up?

Well anyways. PM sent about the lens.
Forum: Flashes, Lighting, and Studio 11-12-2017, 08:41 AM  
HSS with trigger only signal (e.g. P67 + Cactus)
Posted By ppohja
Replies: 7
Views: 818
I'm wondering is there a way to go past older cameras fastest sync with new HSS flashes? E.g. P67 with its 1/30 without going to leaf shutter lenses.

I'm thinking of somehow the radio trigger giving the HSS signal towards the flash. Tried to read the manuals, but can't figure out how would it go.

I've got Cactus RF60'ies and Cactus V5 and V6 triggers. Can invest in V6ii (or any other system) if this helps anything.
Forum: Flashes, Lighting, and Studio 11-10-2017, 11:57 AM  
Are Cactus working on a strobe?
Posted By ppohja
Replies: 20
Views: 1,756
I just doubled my RF60 number from 2 to 4, so having the strobe option (given it'd be compatible with rest of the system obviously hehe) would give nice roadmap for the future.
Forum: Pentax Film SLR Discussion 09-22-2017, 11:35 AM  
Spot the matic. Which one is different?
Posted By ppohja
Replies: 15
Views: 1,355
Hehe it's the 105mm's lens hood, placed undereath to give some angle to the camera.
Forum: Pentax Film SLR Discussion 09-19-2017, 11:57 PM  
Spot the matic. Which one is different?
Posted By ppohja
Replies: 15
Views: 1,355
Hehe yeah, sorry about the pic quality. That's what Hasselblads do.

Lenses are:
1. Takumar 105/2.8
2. Auto Weltblick 35/1.8
3. E.Ludwig Meritar 50/2.8
4. Meyer Lydith 30/3.5
5. Meyer Lydith 30/3.5
Forum: Pentax Film SLR Discussion 09-19-2017, 10:58 AM  
Spot the matic. Which one is different?
Posted By ppohja
Replies: 15
Views: 1,355
Something silly while avoiding work.

Spot the one guy who's different than everybody else. Post your explanation and let's see what we have.
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