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Forum: Pentax Medium Format
08-16-2021, 08:37 AM
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If I remember correctly , you were already looking for higher than 50Mpixels resolution a couple years back because you make big prints and sell them.
I haven't seen any press release from Ricoh Imaging saying they plan to continue or discontinue the 645 product line.
Looks like the Fuji GFX lineup is for Fuji what the full frame mirrorless lineups are for Canon and Nikon, since Fujifilm have skipped full frame entirely they count of their most wealthy Fuji X users to make the jump to medium format. There are rumors that Fuji are going to release a new upgraded GFX camera around september time frame. If true, that'll be Fuji's fifth medium format camera model.
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Forum: Pentax Medium Format
04-08-2020, 12:11 PM
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I'd start by looking at the aperture. Does the diaphragm work smoothly and stop down consistently?
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Forum: Pentax Medium Format
04-08-2020, 04:12 PM
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+1 @Adam. Also if you could post 2-3 examples with the EXIF metadata link, that would also help.
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Forum: Pentax Medium Format
10-08-2018, 12:16 AM
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I work with 100Mp+ camera systems and the grass may be greener on the other side of the fence : you still have to mow it. Hand holding a 100Mp camera will test your camera technique.
However, In the realm of commercial photography this statement is false. In my years of work I have several clients that demand extremely high resolutions. Automotive, Aerospace, and Architecture photography, these are the principal commercial genres where the most skilled photographer, with the most appropriate photographic style and the Highest MP cameras will have a statistically elevated chance of getting the job.
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Forum: Pentax Medium Format
06-12-2017, 06:59 AM
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Forum: Pentax Medium Format
01-26-2015, 07:57 PM
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Highly unlikely unless one has a boat load of money to sponsor some Fab somewhere.
A typical wafer is 12" and last I checked it was $50K, each.
Thats excluding additional processes and yields along the way to make it into a sensor chip.
Yield is going to be poor, since most likely, only 1-2 chips can be gained from one wafer, since a whole 6x7 surface area will need to be good as opposed to smaller formats where some ares can be marked out.
And then we need to add in the cost of making a low volume camera.
Its probably easier to make a fixture to gang up an 2x3 array of Sony A7 or camera of choice (FF sensors), fired off using remote and perhaps have the settings also controlled via a wifi connection to the phone app. (or a phone linked by wifi attached to the fixture) .
The shots are then stitched in PP.
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Forum: Pentax Medium Format
11-02-2014, 02:16 AM
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As Adam says, best to look at each one you're interested in. Some of them are different optically between FA and A, others seem to be much the same (though the coatings might be updated on the FA). There just isn't a single answer for all A-FA comparisons.
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Forum: Pentax Medium Format
07-31-2014, 09:24 AM
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Yes, the 645Z is much faster to bring up images, move between them, and to empty the buffer. Compared to the 645D, the Z is substantially faster at pretty well everything. It usually didn't bother me or prevent me from getting the photographs I wanted, but I was always conscious of the D being a slow mover. Now with the Z, shooting, reviewing and everything else feels a lot smoother, snappier and more responsive. I'm rarely conscious of the camera being busy while I'm trying to do something with it. Pretty much the only time it happens now is if I shoot a longer burst and then instantly try to review; it does still take a bit of time to clear the buffer and bring up the first image.
Live View with DOF preview also works, I think exactly how one would hope. Go into Live View (fit-to-screen or zoomed in), trigger DOF preview, and then scroll around the frame checking focus and DOF. Adjust manual focus and/or aperture and see the effect immediately. One small annoyance -- on FA lenses, if you're already in magnified Live View and pull the focus ring to switch from AF to MF, Live View throws away your magnified view and puts you back into fit-to-screen view. You have to re-engage magnification and scroll back to where you were. Not a big deal but it is an odd little design choice in the way Live View works.
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Forum: Pentax Medium Format
07-18-2014, 10:03 AM
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I have used the 645D since 2011 and the main reasons I want to upgrade to the 645Z is the live view, improved dynamic range and to a lesser degree the high ISO options. The biggest culprit to missing images on the 645D is the autofocus. The unreliability in getting 100% perfect auto focus is also the reason the shutter actuations get used up as quick as they do. I typically have to shoot 2 or 3 frames to be "safe" that one of them is sharp. This is especially true for the 25mm DA lens at certain distances. I print large (see below), so every little focussing error shows up.
Outside of that, I think at base ISO, on most scenes the differences between the Z and D will be minimal. The body has a proven form factor, is very reliable, and I trust it over my A7r which died on me in Antarctica after less than two months of use. The files out of the 645D are a lot more stable when doing lightroom adjustments than the sony files. Things like the occasional banding and purple rings on overcast skies is what makes the compressed, pre-cooked raw files out of the sony less than ideal in large prints. What Pentax really needs is more lenses that are in the class of the 90mm 2.8.
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Forum: Pentax Medium Format
07-17-2014, 07:50 PM
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645Z - 35mm A Lens
3 Old friends Fishing at sunset.
Port Macquarie, NSW Australia.
This is one exposure. I deliberately under exposed this shot and recovered noise-free shadows in Raw. Something my Canon could never do.
Tom
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Forum: Pentax Medium Format
07-03-2014, 06:45 PM
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Going Africa in a few days time. Will do one for you assuming the 500. :)
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Forum: Pentax Medium Format
06-30-2014, 06:12 PM
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Hello all,
Congratulations to everyone on here who already has a 645Z - I am very jealous!
One thing that would be very interesting to me in weighing up the camera is its dark frame behaviour with long exposures (especially with multiple, consecutive long exposures). The 645D was odd in this respect - a custom function suggested the long exposure noise reduction could be turned off, but in practice, it would continue to shoot in some circumstances.
Does anyone who has a 645Z fancy testing this and sharing the results with the group please? I would be massively appreciative and I know I am not the only one interested in this. It is very relevant to shooting star trails pictures.
Essentially, the questions are:
1. Is the a custom function to turn off long exposure noise reduction?
2. If there is, please disable the long exposure noise reduction. If there is not, the following questions still apply.
3. If you shoot an exposure longer than 30 secs (say 45 secs, 1 minute and 2 minutes) does the camera shoot a dark frame immediately afterwards?
4. if you shoot a consecutive sequence of exposures of those lengths, does it shoot a dark frame after each of them, after only some of them or not at all?
It would be awesome to know!
Many thanks,
Ed
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Forum: Pentax Medium Format
02-13-2014, 09:01 AM
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Thanks for the video, hajiaru, could you explain in English some highlights of what is being said in that video?
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Forum: Pentax Medium Format
01-26-2013, 06:13 AM
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the one i have found is all black, maybe I should paint a green band around it?
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Forum: Pentax Medium Format
12-17-2012, 03:56 PM
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OK, did I miss something, or is there something going on here? Self aggrandizement? Everyone who posts on here is trying in some way to get their work recognized in one way or another. If we cut those of us who promote ourselves and our businesses off from the forum, the forum will have lost some very valuable contributors. Lots of pros post here. I don't know one that has made 10 cents from stuff posted on this forum. Personally, I'd love to see news of exhibitions from forum members posted on a regular basis. Self aggrandizement and all. If you can't cheer on those who get exhibitions, my take is, you're not part of the team. There isn't a photographer on the site i wouldn't love to see an exhibition of their work. My complaint with this thread is he's not coming to this end of the country. I'd make an effort to see him if he was. And if he came a didn't let us know because of some worry about "Self aggrandizement" I'd be getting a little hot under the collar.
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Forum: Pentax Medium Format
09-17-2012, 07:50 AM
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I think you asked the wrong question. But all you're going to get from Epson is double-speak anyway. Just think, you wouldn't need to spend as much as a new car for a scanner that does half that resolution if this comparatively inexpensive, commodity flatbed could actually resolve to that advertised resolution. ;)
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Forum: Pentax Medium Format
07-20-2012, 07:10 AM
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Yeah, they come formatted, most likely with a FAT system with default parameters, and most likely the camera formats it to exactly the same specs (there are a few changeable parameters -- block size and so forth). It is all pretty standard. An SD card works physically differently than a hard drive, but logically it works the same, and the formatting is the process by which that can occur -- so the file system is set up just like on a hard drive except that SD cards use the FAT system which most computers don't use for their main drives anymore. But they all CAN use it (they all used to). The main reason you technically "need" to format is that there are multiple file systems out there (ways of organizing/different protocol standards for reading/writing to a hard drive) and the SD card could possibly be formatted with a system the camera does not support (because you can format them in other ways if you want to if you were using it with a particular type of computer only). They come formatted with FAT because that is pretty much universal, and so it is good choice for SD cards and other portable media (like thumb drives) that tend to be used on multiple machines and systems.
So while it is not necessary to go format-crazy like some who format in the camera with each new shooting session, it is probably a good idea to give a brand new card a format in the camera before first use, and also if you ever seem to have any trouble with it, i.e. at any sign of corruption or if anything weird happens to it. For instance, let's say one day you absent-mindedly pull it out of the camera while it is still writing to the card -- you've probably just corrupted it (even if it seems fine at first) -- you should copy what you can off of it immediately and format it before using it again. Or sometimes if you have it plugged into a computer or card reader for transfer and it doesn't get a clean exit or whatever. (Not a bad idea to lock it to read-only when importing to computer to prevent problems, but then you tend to forget that it is locked when you put it back in the camera which is itself a problem.) So if you have the slightly suspicion about the card, transfer any pics on it and format it.
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Forum: Pentax Medium Format
06-01-2012, 07:53 AM
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Hi, I too was a bit surprised (coming from another camera) that the 645D was, by default, changing aperture during M mode bracketing. For landscape exposure blending this was baffling because the camera was changing the depth of field on me (same issue Ryan mentions above), and I certaintly didn't want that. However, these defaults can be changed in the menu settings. Actually, the 645D is very flexible for bracketing, and works very well when combined with mirror lock up and 2s drive delay. So you can take bracketed exposures on a tripod with one press, and not need a remote cable release if 2s delay is good enough for your needs.
Here are my settings:
- Mirror lock-up UP (rotate dial 'M.UP' near right side of lens mount)
- In DRIVE menu, I select Self-Timer 2s. The camera will flip the mirror up, then wait 2s for vibrations to settle, then take the shot(s).
- In MENU page C1, I have "7. One-Push Bracketing" set to "2. On. Pressing shutter release once takes specified number of bracketed shots"
- In MENU page C5, I have "29. Green Button in TAv & M modes" set to "2. Tv Shift. Camera sets shutter speed relative to the selected aperture for proper exposure."
Its the last setting (C5) that switches how bracketing is done. It also changes the behavior of the green button, but in a way that I find more natural, especially when using third-party lens adapters. With those, I set the aperture manually on the lens, then press the green button to have the camera automatically set shutter speed. From here (optional) you can manually bump shutter speed +/- with the finger dial.
I do wish there was a way to have M.UP dial automatically enable/disable 2s delay. That would be one more menu setting (DRIVE menu) I could avoid when switching from hand-held shooting to being on a tripod.
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Forum: Pentax Medium Format
05-08-2012, 03:37 PM
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Interesting that in order to respond to my point, you feel a need to set up a false dichotomy between 'telling the truth, hurting people's feelings, etc.' on the one hand and 'let's keep everybody happy, telling lies, talking behind people's backs' on the other. I am not actually advocating either of these things, because there are other options. It is possible to counter the points made by Mr. Rockwell, and indeed his whole approach, even to describe his actions as idiotic, without name calling. I am certainly not suggesting that we should 'never express criticism' - far from it (as my message demonstrates in fact, I am quite prepared to express criticism). Indeed the criticisms (the substance of which, by the way, I largely agree with) would arguably have more force if they were made cogently and without being abusive. I too think it is important to educate and inform about who is a reliable source. But surely that point is made much more effectively with information and reason.
Ed (who owns and 645D and thinks the points made in Mr. Rockwell's review are absurd).
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Forum: Pentax Medium Format
05-19-2011, 06:38 AM
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Personally, the image comes together in post processing. It is impossible to make a perfect reproduction of a scene and I don't think that is the point of photography. So I process for the content of the image to give it a "realistic/natural" look, but one that emphasizes its strengths. To me, color photography is just as plastic as B&W. So why not use those controls to make the image the best it can be, rather than the most accurate it can be. Every process distorts the original, you cannot make a perfect copy.
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Forum: Pentax Medium Format
04-15-2012, 07:23 PM
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A radical suggestion, go out and take some pictures !!! isnt that what all these cameras are for ??? Pentax, Nikon, Canon, who cares !! Take some pictures and enjoy.. Jeez :confused::confused:
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Forum: Pentax Medium Format
04-13-2012, 07:55 AM
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But one thing is certain--Pentax will know before we can guess...
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