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Forum: Pentax News and Rumors 06-11-2018, 07:41 PM  
DFA*50/1.4 first review
Posted By Cannikin
Replies: 323
Views: 19,166
Seasons are temperature based climatological periods, not directly related to the position of the sun. Summer is the season with the highest average temperatures. In virtually every part of the world the highest temperatures almost invariably occur after the summer solstice in that location, between then and the fall equinox. For example, in the northern hemisphere everyone knows August is a hot month in the middle of summer (in many places the hottest month), but would you consider April to be in summer as well considering it is symmetrical (the same number of months away) to August relative to the June solstice?

Likewise, generally speaking the hottest part of the day is not noon, the time of maximum solar insolation, but a number of hours after 12:00PM (or 1:00PM during DST). The land, water and air continue to heat up in the sunlight even though the sun is no longer highest in the sky. The temperature only starts to drop once the incoming sunlight no longer inputs more heat than is lost by the environment to space.
Forum: Pentax News and Rumors 09-24-2017, 11:15 PM  
D-FA* 85mm f1.4 also coming
Posted By Cannikin
Replies: 1,584
Views: 133,605
Right now, I feel like the lack of 3rd party support is hurting Pentax more than the perceived lack of 1st party lenses, or traditional marketing (it seems like most internet users who might consider a camera at the price point of the K-1 are already aware of Pentax). These days people see 3rd party lenses from Tamron and Sigma (especially Art lenses) on equal ground as 1st party Canikon lenses, and are major drivers of the current DSLR market. I'm pretty sure Ricoh knows that as well when they made it a priority to fill in the f/2.8 zoom lineup at the K-1 launch even if they were actually Tamrons in the case of the 15-30 and 24-70, rather than wait for the snail's pace of 1st party lenses.

While it seems like the 3rd party manufacturers are unwilling to put major investments on the line for less popular mounts like K-mount or A-mount now, they have shown that they are more than willing to deal directly with 1st party camera manufacturers. It's not only Tamron with their rebranding deals for Pentax, but it's been revealed that some high end 1st party branded lenses for m4/3 are actually designed by Sigma, such as the Olympus 75mm f/1.8 and the Panasonic-"Leica" (really nothing to do with Leica) 12mm f/1.4, both highly rated lenses.

If Ricoh cannot manage the time and resources to bring out 1st party FF lenses in a timely manner, I feel like they could more aggressively pursue deals with Sigma and Tamron for their (excellent) optical designs. By spreading out the investment, all involved would be much more likely to commit to K-mount: Ricoh doesn't have to spend lots of time and money to create lenses from scratch, and 3rd parties don't have to take a big gamble on supporting K-mount independently: they would have a guaranteed number of orders through Ricoh itself, rather than trying to gauge unknown consumer/retailer demand. Better yet, if Ricoh simply licenses the optical designs (effectively free money for the 3rd parties, seeing as they have no competing lenses for K-mount as is) then they can build the lens bodies themselves, with that famous Pentax weather sealing, like it appears Olympus and Panasonic are doing now.

If there were a sudden increase in the availability of new, high quality FF lenses, eliminating the perpetual "lack of available lenses" con that is on every otherwise glowing review for Pentax cameras, Ricoh could even increase the prices on future bodies a little while still maintaining the perception of excellent value (especially as even APS-C and m4/3 flagships are now hitting $2000). If the difficult "fast prime" market is handled, they could also redirect more resources to more unconventional lenses that devoted Pentax users seem to love, like the Limiteds.

Win-win for all involved as I see it. Of course the biggest winner of all would be Pentax users.
Forum: Pentax News and Rumors 09-06-2017, 05:02 PM  
Metabones 0.5x Speed Booster for Pentax Q cameras
Posted By Cannikin
Replies: 67
Views: 7,062
That's what I'm hoping for. Even Zhong Yi doesn't make a Lens Turbo for K -> m4/3, only for E-mount (I guess the 1.25mm longer flange focal distance causes problems?). That means the only option right now for K -> m4/3 focal reducers is questionable off-brands from eBay.

I would very much like to use my Sigma 18-35mm f/1.8 on my GH5.
Forum: Pentax News and Rumors 09-05-2017, 07:16 PM  
Metabones 0.5x Speed Booster for Pentax Q cameras
Posted By Cannikin
Replies: 67
Views: 7,062
Currently available: Nikon lens -> Q camera

Later on: K mount lens -> Q camera

Q lens -> DSLR focal reducer is not physically possible
Forum: Pentax News and Rumors 09-05-2017, 05:52 PM  
Metabones 0.5x Speed Booster for Pentax Q cameras
Posted By Cannikin
Replies: 67
Views: 7,062
It means it will have the same AOV as if you put an actual (not "equivalent") 50mm lens on your camera. Crop factor still applies, so yes it would have a slightly narrower AOV than the 06 15-45mm (Q lenses are labeled with their real, not "equivalent", focal lengths).
Forum: Pentax News and Rumors 09-05-2017, 03:40 PM  
Metabones 0.5x Speed Booster for Pentax Q cameras
Posted By Cannikin
Replies: 67
Views: 7,062
You can think of it as a reverse teleconverter. It multiplies the focal length and f-number by 0.5x, e.g. a 100mm f/2.8 becomes an effective 50mm f/1.4.
Forum: Pentax News and Rumors 09-05-2017, 03:03 PM  
Metabones 0.5x Speed Booster for Pentax Q cameras
Posted By Cannikin
Replies: 67
Views: 7,062
Didn't see any threads about this in the news forum or the Q forum, though this was announced a week ago. Initially available for Nikon lenses, announced plans for a K mount lens version.

Metabones Devil's Speed Booster Q666 0.50x Press Release

Still no K mount lens -> large sensor MILC though. :(
Forum: Pentax K-1 06-25-2016, 09:14 AM  
What you could do with a K1 that you can't do without
Posted By Cannikin
Replies: 79
Views: 6,844
I did not say it will "solve all my problems". I have pictures I want to take with certain results. I have clearly identified several instances where APS-C did not get me my desired result (e.g. the framing/composition-DOF dichotomy in my first picture), or where it is unambiguous fact that FF will achieve closer to the (unachieveable) ideal (e.g. astrophotography) for optical (the same principles that apply to telescopes that are much older than modern photography) and practical reasons (fast and wide APS-C lenses are few and far between, especially for DSLRs).

If I am just walking around, not trying to achieve a specific photo that I know FF will be better suited for, my m4/3 kit is significantly smaller, lighter, and more reliably focusing (not necessarily faster, but almost never have problems with back/front focusing) than my K-3 and K-5, while achieving very similar IQ (the difference between m4/3 and APS-C is less than the difference between APS-C and FF). The only thing my APS-C DSLR is better suited for than either now is fast action, which I rarely shoot nowadays.

I have a 5-foot-wide, highly detailed, landscape panorama hanging on my wall right now, daylight and low light landscapes, super shallow DOF flower shots, action shots etc. all of which I'm pretty sure no one could determine which format I used just by looking at them (other than aspect ratio), all shot with APS-C and m4/3 until now, so I know very well what smaller formats are capable of, as well as the situations where they did not quite get what I wanted.

I've done my research, as I'm sure many others have. I don't much appreciate thinly veiled, condescending implications that people who want FF are merely fooling themselves.
Forum: Pentax K-1 06-22-2016, 05:54 PM  
What you could do with a K1 that you can't do without
Posted By Cannikin
Replies: 79
Views: 6,844
I couldn't care less about the relative ability of APS-C and FF to obliterate backgrounds into unrecognizability with a subject 1-2 feet away with the background like 20 feet away. That proves nothing. My m4/3 could easily do that and more with a significantly smaller kit than APS-C DSLRs. Even a cheap P&S can produce a similar effect under those circumstances

I have not had the K-1 long enough to find specific shots that could not be closely replicated with APS-C under the circumstances which they were taken, but in the past I have had various instances where achieving the DoF on I wanted on the K-5/K-3 was no problem, but I was unable to capture the field of view that I wanted because of the limitations of K-mount fast wide angles. Take this shot that I was disappointed with for example:

This was shot with the K-5 with the Sigma 35mm f/1.4 Art. This was before the 18-35mm was available, and thus one of the very few options for fast kinda-sorta-not-really-wide on APS-C K-mount. The point of it was to capture the irony of the kid walking right past the "No Sliding" sign with a toboggan. Wide angle shallow DOF was necessary as the background was full of tons of detail that would make it hard to isolate the subjects, but I didn't want to obliterate the background so the environment and location were still readily apparent (Mount Rainier National Park). Yet the shot was not what I wanted because I could not fit the whole body of the kid in the frame, along with the sign, nor was there any in-focus portion of the ground (which would've been right under the kid's feet).

This was a very quick shot for which I only had a few seconds window (no time for elaborate setups/techniques). No, I could not have "zoomed with my feet" (which is a complete fallacy by the way, altering the picture's perspective and DOF), as that would involve making my way down a steep snow slope, by the time of which the kid would be long past the sign, and/or my gear and I would've tumbled down. The 18-35mm might've gotten a similar, but not as shallow, effect, but it did not exist for K-mount at that time, not to mention the unpredictable AF and AE of that lens may or may not have cooperated at that instant (I know, having owned that particular lens since it came out). A 16-50 f/2.8 would have produced a very subtle shallow DOF effect that would not be apparent except at high magnification.

But using a bit of extrapolation, this picture would've been exactly what I wanted if shot with this exact same lens, same settings, same location and circumstances with a FF camera (well, except for the nervous bokeh quality that I never liked on the Sigma 35 Art).

The other thing that is impossible to replicate with APS-C DSLRs is astrophotography, where absolute aperture diameter (not f-number) is king for light gathering power on stars. Ask any astronomer which is better at gathering light, the Hubble Space Telescope with its f/24 (that's "twenty four") focal ratio or an iPhone with an f/2.4 ("two point four") lens. There is no substitute for a 24mm f/1.4 lens on FF on any smaller format (or even with 645 MF for that matter) in terms of AOV and light gathering power, nor for the upcoming Irix 15mm f/2.4 that I am very much looking forward to. I have tried with 12mm f/2 on m4/3, and the Sigma 10-20 f/4-5.6 and 18-35mm on APS-C and come up with decent looking photos at low magnification with heavy post-processing, but definitely wanting more.

You should in theory be able to do neat tricks like capture more point light sources, like stars, without adjusting exposure for non-points like the moon. This is because point light sources (on the scale of 1 pixel or smaller) are controlled by absolute aperture diameter, while controlling exposure on distributed objects are by f-number (normal exposure). In theory it should be possible to adjust exposure to get more stars to appear without further blowing out the moon in a shot like this if it were taken with a 15mm f/2.4 on FF, rather than the 10mm f/4 on APS-C that it was (that's a quarter moon in the center):

Forum: Pentax SLR Lens Discussion 06-19-2016, 02:25 AM  
Sigma 35 ART or Pentax FA31 for K1?
Posted By Cannikin
Replies: 43
Views: 4,152
A few years ago I did a direct comparison of the FA 31 Limited vs the Sigma 35 f/1.4 Art in terms of bokeh. You can see it here:

Most people seemed in favor of the FA 31's bokeh for its smoothness, especially in the focus transition area (only slightly out of focus areas). The Sigma has less longitudinal chromatic aberration ("bokeh fringing"), but has definite issues with hard edges in the background (can also be seen in many sample photos in reviews). It is very hard to make the FA 31 render unsmooth bokeh.

I have since sold the Sigma. It's a technically very good lens, definitely sharper and more well corrected than the 31 (especially with regards to purple fringing and LoCA), but it was huge in comparison, and shallower DOF (due to the larger aperture) doesn't make up for the bokeh quality IMO. I simply liked using and seeing the photos from the 31 more.
Forum: Pentax K-1 06-08-2016, 03:58 PM  
Lightroom and ACR now support newest Pentax FF lenses
Posted By Cannikin
Replies: 8
Views: 1,059
Just running through some test photos I did a few weeks ago, it does appear that ACR 9.6 has corrected the blue color shift on pixel shift DNGs (may take a few seconds to update the LR previews).
Forum: Pentax K-1 05-24-2016, 06:56 PM  
No "ricoh"
Posted By Cannikin
Replies: 40
Views: 3,715
Take a close look at the bottom plate. ;)
Forum: Pentax K-1 05-20-2016, 02:40 AM  
K-1 Shutter Button
Posted By Cannikin
Replies: 18
Views: 1,542
You know, if I hadn't read this thread, I never would've noticed the difference, and I use shutter button focusing all the time. My E-M1's shutter is also very similarly "mushy", and I have never had a problem half-pressing it, even with gloves on.

Needless to say, it doesn't bother me or affect my handling of either camera.
Forum: Pentax K-1 05-18-2016, 10:53 AM  
Post your K-1 pictures!
Posted By Cannikin
Replies: 18,072
Views: 1,537,779
EDIT: I just noticed that other people already corrected this, but I'll just leave this here for anyone interested in a more detailed explanation of perspective and "wide angle distortion", as this misconception is quite common.

Perspective is entirely controlled by distance. If A and B are the same size, but B is twice as far as A, B will look half the size of A. It's that simple. No properties of lenses or cameras, just pure geometry. Compare the same two objects, and you will find the ratio of their sizes are the same for any rectilinear lens (or your own naked eyes) when shot from the same distance and orientation.

"Wide angle distortion" (objects on the edge of the frame look bigger/stretched compared to the center) is a property of "rectilinear" (gnomonic) projection, and is controlled purely by angle of view in rectilinear lenses. It is a result of mapping a spherical scene onto a flat plane. As the angle approaches 180 degrees, the distortion (stretching) approaches infinity. All rectilinear lenses display this property, just that the size difference between the center and the edges only becomes noticeable as you get very wide. If you've ever seen a video game that lets you dynamically adjust FOV (AOV), you will see this is a property of the geometric projection, not of any lens in particular.
Forum: Pentax K-1 05-10-2016, 02:11 PM  
K-1 fps in AF-C?
Posted By Cannikin
Replies: 5
Views: 1,132
Note he said "AF-C" as in "autofocus continuous", not "APS-C".
Forum: Pentax K-1 05-06-2016, 01:54 PM  
Pentax K-1 Delivery Date
Posted By Cannikin
Replies: 147
Views: 13,183
Sigh, as I feared UPS decides that even though they flew it all the way across the country in 1 day, and it arrived at the local delivery hub about 8 miles from my house yesterday (Thursday), they feel it is absolutely necessary to make me wait the whole "3-Day Select" period, and hold it in limbo for another 3 days (Friday and the weekend). :hmm:
Forum: Pentax K-1 05-05-2016, 08:07 PM  
Pentax K-1 Delivery Date
Posted By Cannikin
Replies: 147
Views: 13,183
Well mine was shipped form B&H on the 4th like everyone else's, scheduled for delivery on Monday the 9th.

However, I just checked my tracking info and UPS says my package already arrived at the local hub here as of 5:23 PM today. So here's to hoping that they do the right thing and deliver it tomorrow, Friday the 6th, rather than keep it in limbo over the weekend just a few miles from me as I know they have done in the past.
Forum: Troubleshooting and Beginner Help 04-27-2016, 05:38 PM  
Over exposure in Astrophotography and O-GPS1
Posted By Cannikin
Replies: 11
Views: 1,561
That overexposure is most definitely light pollution. Against truly black skies, increasing the exposure will only increase:

1. number of stars visible
2. noise (in the case of ISO)
3. star trails (in the case of exposure time)

A general increase in the brightness over the whole image can only be caused by the ambient light level (i.e. light pollution). Don't be fooled by what your eyes tell you is "black" as they will dynamically adjust. The best measure of how dark the skies are is how many stars you can see with your naked eye. Under very dark skies you can see many thousands, versus maybe a few hundred at most under most suburban skies. All but maybe a few dozen of the very brightest stars will be invisible in a city.

Also, DOF is irrelevant for wide angle astrophotography unless you have foreground objects within a few feet (and totally irrelevant with astrotracer as all earthbound objects will be blurred by the star tracking). I'm fairly certain everything at distances measured in lightyears qualifies as "infinity" no matter the aperture. ;)
Forum: Non-Pentax Cameras: Canon, Nikon, etc. 03-30-2016, 04:09 PM  
$$$$ony builds a better bridge
Posted By Cannikin
Replies: 14
Views: 929
All I'm really concerned with is if the slow motion recording limit is still just 2 seconds, and if everything above 240fps still looks like crap. If so, it's still just a gimmick.

If the processor can handle the data throughput of unlimited super-sampled 4k video, there really shouldn't be any reason why 1080p @ 240fps (actually upscaled, not even real 1080p) is so limited, especially with a body this big and expensive.
Forum: Pentax News and Rumors 03-19-2016, 03:38 AM  
K-1 Full res JPGs versus D810 ISO 12800, ISO 51200
Posted By Cannikin
Replies: 103
Views: 19,231
It's probably because of the different perspectives (K-1 is a little closer and more straight on), but the K-1 shots appear to have shallower DOF, making it impossible to judge relative sharpness for the objects in the background.

The D810 shots show a lot more color noise than the K-1, which is surprising considering they're supposed to have a similar if not the same sensor. Some kind of hidden NR on the K-1?
Forum: Pentax Full Frame 03-10-2016, 05:47 PM  
View finder size comparison
Posted By Cannikin
Replies: 60
Views: 5,046
Except the image in the viewfinder is not the focusing screen itself. You are looking at a projection from the pentaprism in which the light passing through the FF focusing screen, with over twice the area of APS-C, is concentrated into a visual area only slightly larger than a K-3's pentaprism projection.

It is the same principle as to why a focal reducer ("speed booster") creates a brighter image, and a teleconverter creates a darker image.
Forum: Pentax Full Frame 03-10-2016, 05:20 PM  
36mp be careful what you wish for!
Posted By Cannikin
Replies: 111
Views: 7,349
This is a very important point that gets lost in the constant discussion of "sharpness". Rather than "sharpness", the important thing to examine is "resolving power", i.e. the ability to see detail on a given real world subject.

A higher pixel density sensor will never resolve less real object detail than a lower density sensor (unless there is a technical issue with the sensor itself). It will always resolve the same or more, even beyond the so-called "diffraction limit" (which is actually two different but related effects tied to f-ratio and absolute aperture diameter). There will never be an instance where you can point to some particular detail in the lower pixel density photo, and not be able to point out the same, and usually more, detail in the higher pixel density photo taken with the same lens.

Of course the K-1 actually has slightly lower pixel density than the K-5 in the center (and infinitely more pixel density in the FF corners), so I don't even really know what the complaint is.
Forum: Pentax News and Rumors 02-24-2016, 11:29 PM  
New lens road map
Posted By Cannikin
Replies: 278
Views: 24,829
Everything "2017 or later". Strange, I would've thought they would have at least a few to show at Photokina.
Forum: Pentax News and Rumors 01-13-2016, 03:38 PM  
LAOWA STF 105mm F2.0 (T3.2)
Posted By Cannikin
Replies: 70
Views: 17,551
Also keep in mind, if you want this for astrophotography, that it is a T3.2 lens, meaning it has a huge light transmission loss of 1.3 stops from its nominal f/2.0 aperture (the Samyang 135mm is T2.2, or ~0.3 stop loss).
Forum: Pentax News and Rumors 11-10-2015, 12:35 PM  
HD PENTAX-D FA ★ 70-200mm F2.8 at 5th February?
Posted By Cannikin
Replies: 1,414
Views: 169,789
The price of the DFA 150-450 has fallen nearly $600 from its introductory price in about 6 months.
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