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Forum: Pentax Q 06-13-2018, 11:49 PM  
Anybody hear about this metabones adapter? f/0.666???
Posted By PiDicus Rex
Replies: 10
Views: 1,486
NOPE !, No, not ever!

What Focal Reducers do, is reduce the amount of the Field of View of the lens lost by the crop factor.

No adapter ever made can increase the Field of View of a lens. The lens itself keeps the same Field of View angle regardless of what it is put in front of, be that a crop camera, a crop camera with a focal reducer, a full frame camera, or an ICL adapter for a fixed lens camera.

Take a FF lens and put it in front of an MF camera (so it would have a negative value for the crop factor) and you don't suddenly get a wider lens, you get Vignetting.

Same goes if you use a focal reducer to compress the image circle down to a negative crop.
Forum: Pentax Q 06-13-2018, 11:39 PM  
0.666 Devil's Speed Booster for Pentax Q
Posted By PiDicus Rex
Replies: 31
Views: 3,059
Back when I was shopping around for a Cine camera, I emailed Metabones and asked if there any plans to support K-mount lenses, and was told flatly and in no uncertain terms, that they will never support Pentax lenses.
That they made this product for Nikon lenses instead of Pentax lenses means that they must consider the Pentax lenses inferior, or that they expect Q owners to prefer non-Pentax lenses are better.

Fotodiox and their new Tilt-Rokr product, do similar - they made it for Pentax 6x7 lenses, but no K-mount version, Nikon, Canon, Sony versions, but nothing for Pentax camera owners.

Pretty silly logic - who is most likely to buy either the Metabones for Q, and the Tilt-Rokr for 6x7 lenses? - Pentax Camera and Lens owners!
We're more likely to own the lenses and the bodies these product are designed for, so they've ignored the biggest potential markets for them.
:(

(rant Ends)


There is a glaring error in the OP,... the lens used is a Nikkor-S 55mm F/1.2.
This means on a FF camera, its a 55mm.

On the Speedbooster, it DOES NOT become the quoted 27.5mm lens.

Using the Q7 crop factor of 4.7, the 55mm with straight lens adapter is equivalent to 258.5mm

Data from Metabones site indicates the Q7 with the speedbooster fitted has it's crop factor reduced to 2.3, whereby the 55mm lens becomes the equivalent of a 126.5mm lens.


It is important to note that no focal reducer (the class of devices the speedbooster brand is) makes any lens Wider then it's native view angle. Ever.

Focal Reducers lower the percentage of the lens view angle lost due to the crop.
Forum: Video and Pentax HDSLRs 06-13-2018, 08:38 AM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
Been there, shot that, yeah, the Pentax glass is fantastic on that sensor, both on a BMPC4K, and on the Cion.
The lenses are also fantastic on the original BMDCC and BMPCC.

Advantage of the BMPC4K and the Cion - Global Shutter, you can dolly sideways at high speed with ZERO jello or Skew.




I think none of us know yet, as it's not out in stores.
If it's anything like the original Pocket Cam, you won't want to use it hand-held, ever.
Forum: Pentax Mirrorless Cameras 06-12-2018, 09:55 PM  
2017 ILC mirrorless option from Pentax - FF or APSC
Posted By PiDicus Rex
Replies: 17
Views: 4,453
Quite a few when you do some searches - they were being used for some high-fashion websites videos to match magazine shoots done on MF cameras.
Forum: Video and Pentax HDSLRs 05-21-2018, 05:03 AM  
Gimbal for K3
Posted By PiDicus Rex
Replies: 6
Views: 643
I'll deny it if anyone ever suggests I posted information on finding bargains for gimbals,.... :D ;)

RC Drones FPV Camera Gimbals | HobbyKing
Forum: Video and Pentax HDSLRs 05-21-2018, 04:56 AM  
K7 Video Issues with Adobe Premiere Pro
Posted By PiDicus Rex
Replies: 4
Views: 471
On top of what's said above,.... how old is your version or Prem Pro?

Premiere was notorious for sync drift over long sections of video, for many years and many versions of the software.

I'd expect there to be a difference in the frame rate of the cameras, but if they're all identical, I wouldn't expect the audio to drift within the camera.
Forum: Video and Pentax HDSLRs 05-15-2018, 12:41 AM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
I can second your experiences - The A7s, FS5 and FS7 all produce stunning visuals in video and in stills, when wearing Pentax lenses.
I'd argue, that on average, the Majority of Pentax lenses are far superior to the Sony equivalents, right up until you get to the G-Master Cine lenses.




I my countries colloquialisms,.... "Bugger,..." :(
Forum: Video and Pentax HDSLRs 05-06-2018, 11:01 PM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
If you feel like wandering in to the head office and making a case for improved functions on behalf of us all,... :D
Forum: Video and Pentax HDSLRs 05-01-2018, 07:05 PM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
Truth.

And we keep having the Stills-Only-Luddite crowd keep on campaigning to block any advancement of video features.....
Forum: Video and Pentax HDSLRs 04-22-2018, 06:29 PM  
Recording time and overheating differences between models
Posted By PiDicus Rex
Replies: 41
Views: 1,189
Not quite correct.
The K-5 was the last to use Mjpeg, everything after uses Mpeg4 (h.264)

The Mjpeg data rate could have been a little faster, and the h.264 data rate is definitely too low, but the CoDec's work in very different ways, so that doesn't paint the whole story.

Mjpeg is an Intra-Frame CoDec, Mpeg4 is an Inter-frame CoDec, with the h624 variant being described as a 'Long-GoP' version.

Intra-Frame CoDec's do all their compression within each single frame.

Inter-Frame CoDec's add in predictive math, and compress across a 'Group of Pictures', by copying repeated data from a keyframe ( " i-Frame " ) across following frames. h.264 uses more frames, hence Long-Group of Pictures.

h.264 All i-Frame is compressed more then Mjpeg, but functions the same, without copying data between frames.

Intra-Frame is a lighter processing load on Editing hardware and software, even with a required higher data bandwidth for the same quality vision.


I've shot stuff with guys using K-30's, K-3's and K-1's,... I don't know who say's Pentax has an overheating issue, but in my personal experience, it's total bullshit.


Correction - Higher Data Rate - the Resolution is still only 1920x1080.


Always means K, KM, KA - Non AF lenses as 'Manual Focus' lenses.
Later AF lenses are a bit crap for video, because the focus throws are too short, and many brands switch to a clutched focus ring without end-stops, which makes Focus-Pulls unreliable.


Use the custom keys menu options - in video the AE button can be assigned to do AF, like back-button-focus for Stills.
Press and hold to refocus in video, but expect it to be slow, miss focus if the light's low, and create a shedload of noise from the screw-drive (making a total mockery of the 'we switched it off because it could be heard in video argument for the lack of mechanical SR since the K-5)


:D
K-01, K-30, K-3, K-1 all eat Sony, Canon and BMD cameras alive in this regard, from K-1 to KP, the only DSLR type camera with better Rolling Shutter characteristics, is the Nikons (using the same sensor and processor supplier).
The only place you're going to get better performance in this regard, is smaller sensors - like the M4/3rds from Panasonic - or with a gimbal,... or a Global Shutter camera, like the Cion or the BMD4K Production Camera and 4K Ursa family.


Most of the people on this forum and the fb Pentaxian's group don't do more then tourist or enthusiast level video, the sort of thing Millennials would do on their phones, and for that, at HD, the Pentax's are still acceptable.
The right event, a KP would even pass for broadcast news.

Indie Film, Cinema, Drama Production, Music Videos, Corporate Video, those definitely need better bodies now.


he he he,... I shoot soooo much on my KA 35 f2, it's almost the go-to for my Cion with the focal reducer when on the shoulder indoors.
Forum: Video and Pentax HDSLRs 04-22-2018, 05:58 PM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
Seconded.
Forum: Video and Pentax HDSLRs 04-17-2018, 06:51 AM  
K-1 questions for Video, specifically external mic/sound suggestions
Posted By PiDicus Rex
Replies: 41
Views: 2,812
You'd be amazed mate, at the number of Stills-Shooters who don't see there's a difference, and expect to be better then every Videographer, just because they can take good Stills.


Spot on.

800 ISO for most Pentax bodies, 1600 if it's 'Newsworthy', the KP goes to 3200 with the same level of noise as the rest at 800, because of the higher data rate.



What a lot of people describe as 'noise' on Mpeg4 based devices, is actually colour blotching and compression artifacts, which grow rapidly as the ISO is raised, as there is too much data for the CoDec to handle.

You won't see true 'sensor noise' until you shoot on a camera capable of recording to ProRes or CineDNG raw
Sensor noise is the visual equivalent of background hiss in sound recordings.
Forum: Video and Pentax HDSLRs 04-17-2018, 06:35 AM  
Recording time and overheating differences between models
Posted By PiDicus Rex
Replies: 41
Views: 1,189
Okie, skipping most of this and just answering Canid's questions,...

Firstly, heat. Unless you're outdoors in direct sunlight on a day with temperatures in the high-30's (Celsius,.... for those of you in the one country that hasn't gone metric,...) the odds of you overheating a Pentax body are negligible.

I've reported in other threads, the one time I saw the temp warning symbol on my original K-01, was in direct sunlight and the temp had hit 41 degrees.

In most uses, you will never overheat a Pentax body.

I've recorded for 4 hours, hitting the button again every 19 minutes, without issue.


Now, as to which Pentax camera to upgrade to?

KP.

Most recent APS-c sensor (Close to super35 sized), and the data rate of the CoDec was taken from 19mbits/second to 24. So it's the most amount of information recorded in the image in any Pentax body.

If I was spending my own money on a Pentax for general use, that's the keeper, especially if needing to record video at night.

If you shoot 95% stills and 5% video, get a K-1ii (we all would anyway,..)

If you shoot 5% stills and 95% video, and don't need 4K, the KP is acceptable.

If you need 4K and want to keep the manual Pentax lenses - GX85, G85, GH4, GH5.
Don't bother with the Sony's unless you can afford a gimbal, the IBIS (Including Sensor Shift!) in the Panasonic's blow everything else away for 4K, but the colour science in stills is waaaay behind Pentax.

I looked very closely at the G85 to replace my K-01's, as I have an external recorder, so don't need the high data rate CoDec's in the GH bodies.

The GH's also use a version of the DLi-90 battery, so if your K-7 uses that, you can keep using the battery.


This is where my Pentax Primes live now.

CION - Science of the Beautiful - Products - AJA Video Systems
Forum: General Photography 04-17-2018, 12:15 AM  
Ricoh Lost in Space
Posted By PiDicus Rex
Replies: 22
Views: 2,860
Assumes 'Wood' on that planet cuts like wood here, but it's an alien world.
The Magnesium thing, is implying that when something burns hot enough, water breaks down in to components, and releases the Oxygen to add fuel to the fire, like the Aluminium Oxide used in Thermite.
Forum: General Photography 04-15-2018, 12:36 AM  
Ricoh Lost in Space
Posted By PiDicus Rex
Replies: 22
Views: 2,860
No, that was episode 8 or 9 :D
It's also in episode 1, when Will first find the ship and plays the footage shown in episodes later on.
Question is, was that footage actually shot on the WG-5

And,... Where TF is any brand promotion leading up to the show's premiere, CaNikon would have been having articles talking about how their product was the right one for the job, advantages to using it, shots of the actors using it,..

Internet searches for "Lost In Space" +Ricoh, this thread is basically the only result.

---------- Post added 15-04-18 at 05:37 PM ----------

Oh/And, loved the show.
Bill Mumy posted stuff about it, but never mentioned his cameo as the new 'real' Dr. Smith in episode 1
Forum: Video and Pentax HDSLRs 04-09-2018, 05:05 AM  
Newbie K-1 video tutorial
Posted By PiDicus Rex
Replies: 10
Views: 698
Sez What?

Run the camera in Video, M.
You set the ISO manually, the aperture manually, and the shutter speed manually, the rest is up to choice of filters.

If the ISO is ramping up and down, you're in Tv or Av or Auto.
Forum: Video and Pentax HDSLRs 04-07-2018, 01:41 AM  
Pentax Cinematography.
Posted By PiDicus Rex
Replies: 49
Views: 4,462
Yes, I did, and shot some stuff too, but 2017 turned in to a pretty horrid year for personal and family events.

The footage is still here, and I'm starting to get life back in to order now.
Forum: Video and Pentax HDSLRs 03-14-2018, 07:18 AM  
Is HD video from a K3 normally this awful?
Posted By PiDicus Rex
Replies: 39
Views: 1,955
+1 for DaVinci Resolve from BMD - I used Edius from 1999 through to the start of 2017, which is when Resolve 12.5 became the first version that would install and run on one of my PC's.
With Resolve 14 (and the required Win10) the free version has become indispensable, and the full version at US$299 / AU$415, is worth the investment.
Forum: Ricoh Theta 360 Cameras 03-13-2018, 05:26 PM  
Sample Theta v file download?
Posted By PiDicus Rex
Replies: 7
Views: 466
I stand by my comments - it's fine for consumer use, but not ready for Pro use to the same level as the K-1 is.

It'd do well for action sports, and would be interesting to use for FPV on RC Aircraft.

And it also shows that Ricoh hardware is capable of the data rates required for high-quality HD Video - the Theta's data rate is exactly the performance level the K-3, K-70, KP and K-1 should have already.

And it shows they can already do 4K, so the reasons given for not doing it in the DLSR's, are more about appeasing the video-haters, rather then what the technology is capable of doing.

If Pentax drops the marketplace thinking for the previous decade and catches up to where the competitors are gone, such as switching back on some of the technology they previously led with in DSLR's, just as they appear to lead with the Theta for consumers, then the better for everyone, as more competitive and current featured products at the traditional Pentax high value price levels, will drive forward sales.

And the more bodies they sell, the more fiances they will have for more lenses.
Forum: Ricoh Theta 360 Cameras 03-13-2018, 05:51 AM  
Sample Theta v file download?
Posted By PiDicus Rex
Replies: 7
Views: 466
Followed the link back from the youtube,... downloaded, plays in VLC, looks at resolution,... " 3840x1920 "

So that's not actually either form of '4K' ( UHD = 3840x2160, & DCI = 4096x2160 ), it's more about 3.8K, two square 1920x1920 images stitched side to side with a whole heap of pixels lost in the un-used section of the stored format.

Taking a snapshot in VLC and pulling that in to Ifranview, then drawing a frame matching a paused image on the youtube playback (at 55 second mark) tells me that a 16:9 (1.77:1 ratio) frame area displayed is around 1140x640 pixels.

Quicktimes Movie Inspector reports a Data Rate of 56mBits,.... Which is EXACTLY where the K-1, K-3 etc should have their HD, so Ricoh/Pentax can do a high enough data rate from their chosen SD Card Controllers, and choose not to in their Professional Grade equipment,.... :(

Data rate for 4K should be 200mBits.

To be honest, I don't think 360deg video is close to mature in this format - when a camera of this design is capable of recording 1080p in the area of the image that matches a standard action camera's 16:9 view angle, then it's use in film and television production will be come invaluable - Think about how easy it will become to do film scenes lit the same way as the House on the Pole in 'Oblivion', where pre-recorded footage was used to light the interior of the studio via massive projectors, or do greenscreen background plates for driving footage.

The Theta has a lot of potential for that use, but not yet.

As it stands, the displayed area within the recording, that matches the view angle of regular action camera, at 1140x640, is too low a resolution to be usable for anything other then tourist videos for now, although sports TV may get away with it for downhill mountain bike racing, or if the cameras HDMI works properly, it may be very useful for FPV tranmission back from racing drones and long-range wings.

The high point has to be the Pentax Colour Science - the graduation from the over exposed Sun down to the the black rubber around the cars sunroof, or the shading in the building sides, is startling.
The only area where a gain could be made here, is in close matching of exposure between the two sensors - when the sun is in both, they match, but in one alone, and there is a step in exposure between the sensors.

It's good to see the company pushing the boundaries, I'd expect the next generation of these cameras to become useful to professionals, while this product cycle opens up the market for consumers.
Forum: Video and Pentax HDSLRs 03-05-2018, 06:27 AM  
Mirrorless 4k video option for Pentax lenses
Posted By PiDicus Rex
Replies: 120
Views: 7,673
Yes, Aussie dollars.

The one I grabbed is EF mount, and the iris is to replace the camera controlled one in the Canon lenses.

I pulled it out because it interfered with the aperture linkage on my KM/KA lenses, and I noted it seemed to vignette more then just control exposure.

Without it, and with the PK-EF ring, there was plenty of clearance inside for the iris control on PK lenses.
Forum: Video and Pentax HDSLRs 03-04-2018, 08:02 PM  
More Video-AF Options in the next APS-C Body and per Update in K-3II, K-70, KP, K-1
Posted By PiDicus Rex
Replies: 30
Views: 1,645
Raw, Video...... As an Aja Cion owner, you can not believe what a pain in the butt getting corporate support for Raw video is.
Forum: Video and Pentax HDSLRs 02-28-2018, 11:00 PM  
More Video-AF Options in the next APS-C Body and per Update in K-3II, K-70, KP, K-1
Posted By PiDicus Rex
Replies: 30
Views: 1,645
Yup,! I read the rest of your comment before posting, but it's an important point we need to keep making.
Forum: Video and Pentax HDSLRs 02-28-2018, 07:04 PM  
More Video-AF Options in the next APS-C Body and per Update in K-3II, K-70, KP, K-1
Posted By PiDicus Rex
Replies: 30
Views: 1,645
Canon also does a version of the 1D with no video. None of the 'Without video' models from any brand are sales hits.


I reject that as myth about resource usage, completely. It doesn't take any resources away, it just uses them fully.

Heck, developing Constant AF for Video would accelerate the development of Stills AF. There's some samples of the AF available on the G85, where video development has lead to Tracking AF that virtually never misses a shot. Sony's E-mount cameras, the A7 and A9 for Stills and video, benefit directly from the AF developed for the FS100, FS700, FS7 and FS5.
Those 'Cine' cameras all use the same lenses as the A7 and A9, and include focus tracking to work around the lens's varifocal nature.

Now, a stripped down 'begineer' model, say, specced about the same as the K-30 was for the sensor, but with only basic features, offered at a price around US$600, that would be the gateway model to get users interested, and it's video spec could retain what Pentax has been doing for the last decade.

4K will have to come - they figured it out for the Theata, and spherical video should actually be harder, since you need to blend the images from two sensors to do it.
Forum: Video and Pentax HDSLRs 02-27-2018, 06:51 AM  
More Video-AF Options in the next APS-C Body and per Update in K-3II, K-70, KP, K-1
Posted By PiDicus Rex
Replies: 30
Views: 1,645
Yuuuuup,.... looks like I started a flame war on the facebook Pentaxians page, posting a link to a Redshark article about the new Eos-M having 4K.

Then I saw the survey running at the moment, and it's pretty clear there's a lack of interest in video by the person(s) who formed the questions.

Wonder what they'll think of me fitting 6x7 Primes on stacked focal reducers to get "70mm" looking images off my Cion's S35 sized sensor? :D
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