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Forum: Pentax K-1 4 Days Ago  
Does K-1 limit use of flash to sync speed?
Posted By Class A
Replies: 15
Views: 2,131
1/200s


The K-1 has a setting for the maximum shutter speed. Unless you changed it, it should still sit at 1/200s, though.

You need to have 1/3 stops selected for the EV step setting. Choosing the "X" mode should also work.

If you want to go beyond 1/200s on the K-1, and want to use radio triggering, you need an HSS-compatible radio trigger like the Cactus V6II, Phottix Odin II, or Acon R930.
Forum: Pentax Full Frame 5 Days Ago  
Lens Compatability
Posted By Class A
Replies: 4
Views: 398
The DA 40 and DA 70 are not bona fide FF lenses. Some find them usable, in particular in 1:1 crop mode, but they deliver a compromised performance on the full FF frame.

I don't have any problem with people not worrying about the optical shortcomings outside the APS-C image circle, but one cannot simply state that these lenses are FF lenses with a DA moniker.

N.B., for sure some DA lenses could carry a D-FA moniker without any issue because they are based on FF designs, for instance. The DA 40 and DA 70 were always designed for APS-C, though and clearly struggle on FF (beyond benign issues like vignetting).
Forum: Flashes, Lighting, and Studio 6 Days Ago  
Off-Camera Flash setup for K3-II
Posted By Class A
Replies: 10
Views: 385
The YN560TX transmitter stevebrot mentioned will give you remote control over power levels and respective Yongnuo flashes have radio receivers built in which is very nice.

The downside of the Yongnuo system is that it isn't dedicated to Pentax and hence won't give you the option of using flash with a shutter speed higher than 1/180s.

If you want to do outdoor portraits with shallow DOF, you'll find that 1/180s is often not fast enough even at the lowest ISO setting. Then you either have to use neutral density filters (which come with a number of potential issues but are at the very least inconvenient to use) or you use HSS (high-speed-sync) flashes (which are not available for the Yongnuo system for Pentax).

Note, however, that when using HSS outdoors, you'll typically want to use multiple speedlights or a compatible strobe as a single speedlight will struggle to provide enough power in such conditions, in particular when used with a modifier.


Both of these support HSS and a number of extra features that you'll find useful one you advance beyond basic flash photography.

Beyond HSS, you have second-curtain sync and automated metering both of which are only available on trigger systems with Pentax dedication. The Cactus V6II has a host of further features like flash delay, group cycling, etc. which may seem exotic at first but can come in really handy when you need them.

I'm less familiar with the Phottix system but the Odin II is a very good trigger that has been available for Canikon for a long time already. Unfortunately, the Phottix system is rather limited in terms of what speedlights/strobes are supported for Pentax. The Cactus system is much more third-party friendly however that mostly matters if you already have flashes that you'd like to continue to use.
Forum: Pentax K-1 6 Days Ago  
What do you use the function dial for?
Posted By Class A
Replies: 30
Views: 1,823
I use the third wheel for configuration options like "Wi-Fi", "Crop", "SR' and "Grid".
I find it easier to choose the respective option and then turn the dial compared to using the menu system (including the custom menu which still requires navigation for most options).
Doing so allows me to keep the back LCD turned off most of the time, thus saving battery life.

I wish the top LCD provided feedback about the current configuration choice as non-binary choices that do not provide feedback in the viewfinder require the use of the status screen, which I normally don't use at all. Having said that, I prefer the use of the segment top-LCD Ricoh went for over the use of a matrix LCD which would have made it easier to display feedback about the configuration options.

I'd appreciate if I could use the third wheel for the value range options exposure compensation and ISO, but I find it to be unreasonably stiff for this purpose. I find it too hard/slow to move with just the thumb and find pressing the +/- button or "ISO" button in conjunction with the back dial is easier than using an extra finger on the third wheel.
Forum: Pentax News and Rumors 06-12-2018, 08:21 PM  
DFA*50/1.4 first review
Posted By Class A
Replies: 313
Views: 15,896
The concept of a "normal" lens is not related to angle of view but to perspective distortion based on certain assumptions about viewing conditions. In the case of stills photography, the assumption is that one will look at an image from a distance that corresponds to the diagonal of the image. Hence, a "normal" lens has a focal length that is equal to the diagonal of the sensor (~43.3mm in case of FF, hence the FA 43/1.9; 50mm lenses are often referred to as "normal" lenses but strictly speaking would require looking at an image from a slightly larger distance than the image diagonal would suggest).
Forum: Flashes, Lighting, and Studio 06-12-2018, 07:47 PM  
Battery Pack for Cactus RF60x?
Posted By Class A
Replies: 6
Views: 278
The batteries are the correct type, but the charger is exactly the cheap wall-charger type I tried to discourage you from. Note the remark "Batteries must be charged in pairs." which means that there is no monitoring of individual cells, but only of pairs. This is not ideal. You'll save so much money from not buying Alkalines anymore that you should, IMHO, get a decent charger that preserves your investment into the rechargeable cells. The MH-C800S mentioned by stevebrot is a good one, for instance.


That's not quite true because there is some circuitry in the power pack as well.


Well, it significantly extends the time you can shoot without interruption.

There is also a slight gain regarding recycling times, but nothing dramatic.
Forum: Flashes, Lighting, and Studio 06-12-2018, 09:57 AM  
Battery Pack for Cactus RF60x?
Posted By Class A
Replies: 6
Views: 278
Everything stevebrot said was spot on.

Perhaps adding to that:
Even with a battery pack (taking eight AAs or one big Li-Ion battery), you'll need four AAs in the flash. The flash won't operate only off the power pack.

The battery pack mainly increases the flash's stamina (you'll find it very hard to run out of juice), but it doesn't do wonders to the recycling rate (which is already at a phenomenal 1.9s for the RF60X without a pack).

I recommend the white Eneloops unless you really absolutely need to maximise battery life. The black ones have a higher capacity but a reduced number of maximum recharge cycles.

Finally, get a decent charger. There is no point in hurting your rechargable with cheap wall chargers that do not charge cells individually, charge them too quickly, don't offer a refresh function, etc.
Forum: Pentax K-1 06-12-2018, 09:45 AM  
Lonely speck review of the K-1II for astrophotography
Posted By Class A
Replies: 49
Views: 2,076
+1
The same holds true for the size. I don't find the K-1 (II) to be a "very large camera... even compared to other similar DSLRs". It is actually smaller (less wide and less tall, albeit sometimes a tiny bit deeper) than other flagship DSLRs.

BTW, I like the weight of my K-1 as I feel it helps me to stabilise hand-held shots. The fact that lightweight (which often means flimsier) and compact (which often means fiddlier) are not always desirable attributes seems to be rarely acknowledged (in particular not by a particular review site particularly enamoured with small mirrorless cameras (that nevertheless need big lenses to perform in general)).

Overall, I found the review to be very well done and very balanced.
Forum: Flashes, Lighting, and Studio 06-11-2018, 01:43 AM  
Lets Get Outdoors With Some Radio TTL!
Posted By Class A
Replies: 12
Views: 616
Seems a lot of effort to deal with long cable connections just to get support for flash exposure control.

With a 645N you are probably not photographing action so it would seem simpler to trigger off-camera flashes via radio triggers and manually control the flash power. If you are concerned about not getting the power levels right using guide numbers and measuring distances then a flash meter should do the job.


If TTL mode is not supported "wirelessly" then there is no point to looking into the Aokatec system.


I'm pretty sure that the Aokatec system is flash system agnostic. It just converts optical signals into radio signals and back. So if the AF500GTZ would have supported its TTL magic via optical communication with another camera flash then I'm rather sure the Aokatec system would have played with it.
Forum: Pentax Full Frame 06-10-2018, 05:45 AM  
Wide angle lenses
Posted By Class A
Replies: 20
Views: 995
In addition to the two Venus Optics lenses that are already covered, there is also a Venus Optics 25/2.8 Ultra Macro lens.
It doesn't focus to infinity as it is a very specialised ultra macro lens, but probably should still be added to the database.
Forum: Flashes, Lighting, and Studio 06-09-2018, 10:25 PM  
Lets Get Outdoors With Some Radio TTL!
Posted By Class A
Replies: 12
Views: 616
The V6II with the multi-brand firmware has no problem supporting distances up to 100m.

I haven't tested the X-TTL firmware variant (the one that supports P-TTL) for maximum reach but it should support a very similar, if not the same, range.



If it is possible to optically trigger/control the AF500GTZ then the Aokatec trigger system could be the solution you are after.
Forum: Pentax News and Rumors 06-09-2018, 10:11 PM  
DFA*50/1.4 first review
Posted By Class A
Replies: 313
Views: 15,896
Definitely get the big boy! At the current price, the K-1 is a steal and such fun to work with.
Forum: Troubleshooting and Beginner Help 06-09-2018, 04:09 AM  
Macro lens on APSC and FF
Posted By Class A
Replies: 53
Views: 1,395
It depends on the lens. The requirements on lens quality are a lot higher, if you use very small sensors with very high pixel densities.

The enlargement factor for smaller sensor is higher, for a 1/2.3" sensor it is 5.5, and this will magnify any lens problems (just like cropping does).


You don't obtain better DOF from using small sensors (or smaller pixels).


Why do you think that?

Just crop the image of a big sensor to the dimensions of the small sensor. As long as you still have as many pixels as the smaller sensor has, there will be absolutely no difference to capturing with a small sensor in the first place.
Forum: Troubleshooting and Beginner Help 06-09-2018, 12:37 AM  
Macro lens on APSC and FF
Posted By Class A
Replies: 53
Views: 1,395
If that's the case, just back away with your FF camera and shoot in APS-C crop mode.

Everything else being equal, an APS-C image is just a pre-cropped FF image (without an option for undoing the cropping). There really is no advantage to APS-C unless the particular APS-C sensor happens to provide a higher pixel density.
Forum: Pentax News and Rumors 06-08-2018, 11:09 PM  
DFA*50/1.4 first review
Posted By Class A
Replies: 313
Views: 15,896
DOF is a concept related to viewing images, it has nothing to do with AF.

If you use a DOF calculator, try to find out what viewing assumptions it makes.

Typical DOF definitions assume a circle of confusion size that makes areas within the DOF look sharp in a 8″10″ print viewed from 25cm.

When you pixel-peep at 100% magnification on a 24" monitor at a 36MP image, you'll see a much thinner DOF. You cannot expect 11cm in the scene to look sharp at such an insane magnification.

I looked at some of the images and saw no reason for concern. Areas in focus should sharpen up very well. The bokeh looks lovely. I hope it won't be too pricey because it looks like a formidable lens.

P.S.: In case anyone is disappointed with the performance (not sure why the would be, but still), isn't there a reason for the release date delay? Perhaps we are looking at the performance of a prototype lens?
Forum: Troubleshooting and Beginner Help 06-08-2018, 10:07 PM  
Macro lens on APSC and FF
Posted By Class A
Replies: 53
Views: 1,395
There is no advantage to APS-C when shooting macro.

Some APS-C cameras may support more digital zooming (cropping) but that's not a consequence of their sensor format but of their higher pixel density.

For instance, shooting macros with a K-5 (II) or K-1 (II) will give you pretty much the same images in terms of resolution because these sensors share pretty much the same pixel density (~208 pixels/mm vs 205 pixels/mm horizontally).

If you choose a K-3, then you get 256 pixel/mm horizontally which is a ~19% increase in resolution which could be used for "digital zooming". You'll be stressing the lens' capabilities more when doing this, but it is often a legitimate way to simulating getting closer.

However, this is not a perk courtesy of the APS-C format but of a higher-density sensor. So if you are looking for the ideal macro camera, do not pay attention to the sensor format but to the sensor pixel density.
Forum: Pentax K-1 06-08-2018, 03:10 AM  
DPR's K1ii Re-shoot is up: Score now 80%
Posted By Class A
Replies: 192
Views: 7,051
The "accelerator" processor is not an analogue unit. There is no "boosting" (as in amplification).

Fourier transform (taking the image from the spatial domain into the frequency domain) analyses show that there is high-frequency attenuation starting with ISO 640. This does not happen with regular noise reduction (such as dark frame substraction). This only happens when denoising techniques are applied that use smoothing which itself is based on determining the value of a pixel depending on its local context (cf. "nearest neighbour" approaches).

One can debate the visual impact all day long and even come to the conclusion that one prefers the treated output, but objective measurements don't lie.
Forum: Travel, Events, and Groups 06-08-2018, 03:01 AM  
Kiwi Pentaxians
Posted By Class A
Replies: 15,096
Views: 857,421
Perhaps separate with mutual cross-referencing and offering discounts on multi-buys?
Forum: Travel, Events, and Groups 06-07-2018, 08:32 PM  
Kiwi Pentaxians
Posted By Class A
Replies: 15,096
Views: 857,421
The dwarfs wears an invisibility cloak to avoid interference with the picture taking.
Forum: Pentax K-1 06-07-2018, 05:01 PM  
DPR's K1ii Re-shoot is up: Score now 80%
Posted By Class A
Replies: 192
Views: 7,051
The difference can become significant when using image stacking (e.g., in astrophotography). Stacking noisy but otherwise intact images will result in a final image with proper detail. Stacking already denoised images cannot perform the same feat.

Furthermore, future RAW developers may offer advanced (not yet existing) denoising methods that will depend on unmodified data.


Quite possibly many are fine with the RAW manipulations. However, we do not know how many opted for the conversion without knowing about the consequences.


For sure.
I wonder whether DPReview's planned comparison between K-1 and K-1 II images will account for that. If they do, they potentially may find that their initial assessment may not be as defensible as they thought it would be (depending on how robust the K-1 II processing really is).


Yes, undoubtedly.
I have no problem at all with people who prefer the K-1 II output.

I still maintain, though, that it was unwise to give DPReview that kind of ammunition. Even if no single user would ever be negatively affected by the "accelerator" processing (most likely a purely hypothetical scenario) then DPReview's criticism of the mandatory denoising still nevertheless hurts Pentax and Pentaxians. For that reason alone, the feature should have been made optional to start with.
Forum: Pentax K-1 06-07-2018, 04:45 PM  
DPR's K1ii Re-shoot is up: Score now 80%
Posted By Class A
Replies: 192
Views: 7,051
I do.


Different cameras produce different images of the same scene. It doesn't make sense to then let some adaptive processing potentially homogenise differences.


Of course, you can. But then you are suggesting to move away from Pentax. This is not the first thing that springs to mind to most members of this forum.

The point is that it is completely unnecessary for Ricoh to alienate some subset of Pentax users. All they have to do is to make the processing optional.


You seem to miss that ACR does not "manipulate the raw data".
Nothing "manipulates the raw data", except potentially the camera.

Also, the fact remains that I can replace any RAW developer I don't like with another one. I cannot do the same with the camera without having to replace all my lenses, potentially start using an EVF or lose image stabilisation or weather-sealing, etc.


Is that so? Do all makers manipulate the sensor data?
Do you have anything to corroborate that view?

Note that the idea of all manipulations being created equal is of course nonsense. It is not the case that all RAW files are all lying only in different ways. This discussion is not as subjective as you may think it is. DxoMark and PhotonsToPhotos have measured RAW file properties. It is not uncommon across brands to do some manipulation at ridiculously high ISO levels. Personally, I don't care if any processing is applied to an ISO 102,400 image as it always going to lack any reasonable sense of fidelity.

Pentax seems to be unique in starting processing at ISO 1600, and now with recent camera models at ISO 640 already. The respective analyses show that the processing is not just any kind of data massaging but destructively smoothes out higher frequencies, i.e., performs denoising.

So, no, it isn't the case that everyone does the same thing anyhow and that everyone is assuming what they want.
Forum: Pentax K-1 06-07-2018, 04:26 PM  
DPR's K1ii Re-shoot is up: Score now 80%
Posted By Class A
Replies: 192
Views: 7,051
Perhaps, but maybe not.

I was impressed by the detail you recovered from one K-1 II image, but I'm sceptical that the same technique will be successful with different scenes where the "accelerator" may have smoothed irregular details (such as the dust particles on Adam's electronic component images).

I also noticed blotches in your processed K-1 II image that weren't present in the K-1 version; I guess that's what DPReview refers to as "artefacts".

I find some noise to be quite natural but smoothed surfaces and artefacts to be rather unnatural.
Forum: Flashes, Lighting, and Studio 06-07-2018, 04:07 PM  
K-1 and wireless off camera TTL help!
Posted By Class A
Replies: 13
Views: 448
Yes, any wireless trigger will work, however,
  1. if you get very cheap ones, make sure they support the 1/200s sync-speed of your K-1. No need to be stuck with triggers that only fully work at 1/160s max, or so.

  2. I agree with awscreo that manually controlling flashes is a good idea, but once you have tasted remote power level control, you'll never want to go back to a system that makes you walk to each flash to change its power level. If a flash is hard to reach (high on a light stand or hidden within a softbox, etc.), it becomes very tedious to adjust power levels. Hence, I'd least get a V6 trigger that supports remote power level and remote zoom setting control. You'd have to check compatibility with your Metz model, though.

  3. All of the above only support shutter speeds up to 1/200s on your K-1. If you want to use higher shutter speeds then your trigger system needs to be HSS-capable. The V6II that has been mentioned already supports HSS and on top of that (optionally) P-TTL.

Forum: Flashes, Lighting, and Studio 06-07-2018, 04:14 AM  
Godox XProC on Pentax: tests with my K3II, V6 II and other Godox equipment
Posted By Class A
Replies: 13
Views: 1,303
Oh, as long as it is just the battery level indicator playing up, that's completely normal.

NiMH accumulators don't lend themselves for useful battery level indication so battery level indicators are always calibrated with respect to Alkaline batteries.

As long as the trigger is working fine with NiMH accumulators and only the battery level indicator is "broken" then there is absolutely no problem. You can most likely save quite a bit of money, even if the triggers don't eat through Alkaline batteries very quickly.
Forum: Travel, Events, and Groups 06-07-2018, 04:03 AM  
Kiwi Pentaxians
Posted By Class A
Replies: 15,096
Views: 857,421
Yes, for most cameras the shutter curtains travel from top to bottom.

Some cameras, for instance the K-1, have a reversed motion. Their shutter curtains rise from bottom to top.

@zkarj
GUB's explanation regarding the slow scanning vs fast shutter speed is correct. Just imagine that that the whole sensor is normally insensitive to light. Light can shine on it, but it won't result in any exposure. Now imagine a small dwarf prying open a small horizontal slit at the top of the sensor for a very short time (say 1/750s). Then the dwarf moves one row down and prys it open for 1/750s as well. The dwarf is rather slow, so it takes the dwarf 1/5s of a second to pry open all the rows from top to bottom. By the time the dwarf has reached the bottom of the sensor, the scene will have changed if there are any moving objects. This leads to the crazy "rolling shutter" distortions" as you are not seeing the same scene for 1/750s, but many scenes, each for 1/750s.
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