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Forum: Flashes, Lighting, and Studio 08-13-2019, 09:30 AM  
Godox TT350P and Cactus
Posted By sprint113
Replies: 23
Views: 1,814
Just got a TT350P (v1.2) for my Cactus V6 II (PEN.A.005) ecosystem. I use an off-camera RF60x as my main flash and sometimes use an AF360FGZ on a V6 II as either fill or as a gelled background light. The idea was that the TT350P would basically be a smaller, slimmer replacement for the AF360FGZ since I don't use it that often, but still end up carrying it around "just in case".


So far, I have found that the TT350P seems to work fine on camera; TTL, HSS, Manual mode all seem to work okay. On the remote V6 II, TTL seems to work fine, and usually remote manual power control also works. However, so far, HSS doesn't seem to work, either with the TT350P's HSS mode on and off. Also, the flash head auto zoom doesn't seem to respond to manually changing the zoom in the master V6 II. Given my usage, the two issues are not dealbreakers as the "effects" flash usually isn't shot in situations where I'm using HSS. I'll have to see how the flash works in the field though. I'll probably post on Cactus' page to see if they have any inputs on resolving the issues.
Forum: Pentax K-1 10-10-2018, 01:48 PM  
Focussing screens for the K1 DIY split image
Posted By sprint113
Replies: 68
Views: 12,588
After getting my K-1, the first thing I did was order a Canon A-type (microprism center dot) focusing screen from focusingscreen. I have gotten both A type and S type focusing screens for my previous Pentax cameras from him. After receiving the focusing screen, I spent an evening trying out the included plastic shims until I was happy with the accuracy. Notably, the stock shim felt much thicker than the ones that were on my K-3 and K-5 and I had to reduce the thickness of the shim for Canon's thicker focusing screen.


After seeing this post, I gave it a try by buying a Canon ec-S focusing screen. The only modification needed was to cut off the grab tab. As far as I can tell, everything seems to be fine. The Canon ec-model (1D) screen is close enough in size to Pentax's that no other modifications were needed. Predictably, the shimming I had done for the Canon A type was still valid for the S type as both were ec model screens.


General thoughts:

  • For the crop sensor cameras, using focusingscreen to cut the screens down to size really helps. Not so much for the full frame K-1 if you're using Canon ec screens.

  • Focusingscreen does re-attach the tab in the correct location for the K-1 screens, which makes handling a lot easier/safer.

  • Focusingscreen includes plastic shims, which most likely will be necessary. Easier than trying to fabricate your own.

  • The K-1's shim holder seems much more fiddley. Maybe the larger size (vs crop) meant that the plastic shims were less rigid and more likely to interfere with the focusing screen. Might want to look into sourcing/fabricating metal shims

  • Back when Pentax handled service themselves, the part # for focusing screens shims were known. Even after the shift to third party repair shops, if you knew the part #, you could ask some smaller camera shops to order them directly from Pentax for you. So far haven't had any luck with K-1 shims.

Forum: Pentax K-3 08-24-2018, 01:23 PM  
Anyone using the Feiyutech a1000?
Posted By sprint113
Replies: 9
Views: 1,489
I'm looking at their website and seems like the included shutter cable is for Sony. Since it seems to use a 2.5 or 3.5mm jack on the gimble side, it's possible that simply getting an appropriate cable will get it to work with Pentax.


The whole bit about being compatible with Canon/Nikon seems to just indicate that those cameras will attach to the gimble, for search engine purposes.
Forum: Flashes, Lighting, and Studio 08-24-2018, 09:48 AM  
Remotely control flash power
Posted By sprint113
Replies: 10
Views: 675
Most likely that would not work. None of the main manufacturers (Canon, Nikon, Pentax) had their own radio triggering systems, so there was no "standard" to use. Therefore, all third party manufacturers independently came up with their own RF communication protocol, so generally, there is no cross compatibility. I think that's why a lot of users here have gotten into Cactus, as that is one of two brands that have catered to a full-featured transponders for Pentax DSLRs.
Forum: Flashes, Lighting, and Studio 08-20-2018, 07:54 PM  
Replicate this bug for me please (V6ii needed)
Posted By sprint113
Replies: 17
Views: 876
Testing it on my K-3 with Samyang 85mm and with the PEN.A.002 firmware + AF540FGZ set to HSS.


In Av mode, things behave normally, shutter speed changing depending on available light. Upon turning on the Tx V6II, shutter speed gets locked to 1/180. If I look at a very bright light source, the shutter speed will increase as needed.
Forum: Flashes, Lighting, and Studio 08-07-2018, 11:19 AM  
Why do I need Cactus?
Posted By sprint113
Replies: 15
Views: 1,416
The Cactus V6 II does have a "Powersync" alternative to HSS that will fire a non-HSS flash and you can manually adjust the timing of the flash to try and see just how short an exposure time you can manage before banding occurs.
Forum: Flashes, Lighting, and Studio 08-01-2018, 08:37 AM  
Why do I need Cactus?
Posted By sprint113
Replies: 15
Views: 1,416
Ah, I remembered that Pentax had some incompatibility, and couldn't remember if it was Pentax flashes not working with other bodies or Pentax bodies not working with other flashes. Well, maybe they'll be able to find an "impossible" solution down the road.
Forum: Troubleshooting and Beginner Help 07-29-2018, 09:52 PM  
Sticky Shutter
Posted By sprint113
Replies: 7
Views: 813
Had this happen on my K5 and K3 once or twice. Both times was while using one of my less reputable third party batteries. I sort of stopped using them and haven't experienced the problem since, but the problem was a rare occurrence in the first so I can't be 100% sure it was the cause.
Forum: Flashes, Lighting, and Studio 07-29-2018, 06:00 PM  
Why do I need Cactus?
Posted By sprint113
Replies: 15
Views: 1,416
I believe the RF60 should allow HSS with V6 II. You may need to update the firmware to version 200 or higher. I believe this also makes it incompatible with the V6 I, although supposedly there is a firmware coming out soon that makes the V6 I more compatible with the V6 II. The main additions to the RF60X is improved charge time, an AF assist light and better prevention of overheating.

---------- Post added 07-29-18 at 09:39 PM ----------



The main draw of the V6 II is the RF wireless transmission of the P-TTL signal. In short, the P-TTL signal is transmitted through the hotshoe and basically tells the flash unit some information about the exposure, the flash does a pre-fire and the camera/flash will evaluate the result to determine the actual flash power to properly light the scene; it is essentially auto exposure for flashes. The V6 II is able to take that data from the hotshoe and transmit it wireless to a remote flash unit. There are other wireless RF triggers, but they do not transmit P-TTL signal, so the flashes need to have their power level set manually. The other wireless P-TTL system native to Pentax flashes relies on optical triggering from the pop-up flash or an on-body flash acting as a controller/master. In some lighting situations, the contribution of the on-body flash is undesirable, but with this setup relying on optical triggering, it is difficult to prevent. In theory, you could put an IR-pass filter over the flash, but that can be unweildly at times.


In short, the V6 II allows you to have a flash remotely placed and have its power set automatically.


The RF60X with their Pentax firmware is basically a Pentax P-TTL flash with a Cactus V6 II built in, with the opportunity to also change it to some other brand should you choose to switch systems or sell the RF60X. You could also just buy more V6 II for your current flashes. It is also a HSS so you can use it above the sync speed.


You can also remotely adjust the power level of the remote flashes. Instead of having to go to each unit to adjust the +/- EV or power ratios, you can do that from the on-camera transmitter.


Finally, the V6 II can work with multiple systems, hence the X-TTL nomenclature. In theory, you can borrow someone's Canon E-TTL flash or Nikon iTTL flash and have it work like a P-TTL flash. There is a note about incompatability regarding the P-TTL system, but I am not sure if that means Pentax bodies can't use other brand TTL flashes, or other brand bodies cannot use P-TTL flashes.
Forum: Pentax SLR Lens Discussion 07-29-2018, 03:28 PM  
Circular Fisheye (circle, 180) options?
Posted By sprint113
Replies: 6
Views: 686
It may not be optimal, but the Samyang/Rokinon 8mm fisheye II. Originally, version I had a permanent built-in hood restricting the FOV to an APS-C view. Version II has a detachable hood which results in a 180 degree circular image in full frame view.
Forum: Pentax SLR Lens Discussion 07-29-2018, 03:18 PM  
Pentax-A 50mm f2.0 or Pentax-M 50mm f2.0
Posted By sprint113
Replies: 15
Views: 915
I believe that both lenses use the same optical formula so they should be nearly identical in optical performance. For Pentax DSLR shooters, the A variant probably has more value due to the A setting, making it easier to use. However, I think the A body used more plastic, especially in the aperture ring, which can hamper manual aperture operation a bit. In any case, both lenses are usually found pretty cheap on ebay, like copies sold for <$10.
Forum: Pentax DSLR Discussion 07-29-2018, 12:40 PM  
Is my K5 mount damaged ?
Posted By sprint113
Replies: 3
Views: 809
Compared it to mine as well and it looks about the same. Maybe its just you not remembering how it feels after using a M42 adapter, especially if the adapter doesn't fit as tight. Or perhaps moisture/temperatures made the mount fit a bit tighter.
Forum: Flashes, Lighting, and Studio 07-28-2018, 08:46 AM  
K-3 and YN6585EX
Posted By sprint113
Replies: 9
Views: 550
So the main advantage of the Pentax wireless flash is that it can do TTL, which for people new to flash, can make things easier. Yes, the pop up flash (or some other master/control flash on the hotshoe) needs to be up to trigger the remote flash and even in controller mode, the pop up flash will have some contribution. You can try putting an IR filter over the pop-up flash, either DIY or purchase a Nikon SG-3IR pop up flash panel.


If you are fine with manual flash control, then cheap radio triggers with compatible manual flashes are probably a suitable solution. Some of the fancier ones do allow for remote control of power levels so you don't need to run back and forth. And there are 1 or 2 triggers that support Pentax P-TTL flash control.
Forum: Pentax Camera and Field Accessories 07-28-2018, 08:31 AM  
Best cross-body strap for D-FA*70-200 on K-1?
Posted By sprint113
Replies: 26
Views: 1,521
Also a fan of Op/Tech straps. I have both of their slings and prefer the one that supports 2 bodies simply because the extra loop helps keep the shoulder pad from rotating away. Each loop has 2 buckles. One is sufficient for most camera weights (K-3 + Grip + Sigma Art 35/Samyang 135), but the second one can be connected in a pinch for added security. I also like that I can quickly reuse the existing connectors with their wrist strap.
Forum: Pentax Price Watch 07-17-2018, 09:16 AM  
This is why I hate ebay... FA* 80-200 "Good" condition
Posted By sprint113
Replies: 47
Views: 2,581
To be fair, a lot of sellers separate "appearance"/cosmetic condition (i.e. barrel) from the optics. The seller is Japanese and probably chose the wrong way to use the word appearance.
Forum: Pentax SLR Lens Discussion 04-12-2018, 09:33 PM  
SMC DA 35mm f/2.4 AL All Metal mount
Posted By sprint113
Replies: 8
Views: 1,289
Like tibbitts said, it's probably the FA 35mm 2.0, or an older lens. It would help to post a picture. If it has an aperture ring, make sure it is set to "A", otherwise you will need to change a setting in the menu to allow aperture ring use and use green button stop down metering.
Forum: Sold Items 02-01-2018, 08:48 AM  
For Sale - Sold: Pentax KP with Accessories for Pentax K-3II
Posted By sprint113
Replies: 2
Views: 949
Thought I was having an aneurysm and seeing double. There is some member 2 posts down https://www.pentaxforums.com/forums/24-photographic-equipment-sale/359777-tr...r-kp-body.html
Forum: Pentax SLR Lens Discussion 07-13-2017, 01:17 PM  
which is the best 50mm k mount lens?
Posted By sprint113
Replies: 81
Views: 7,658
I have the A 50 1.7, A 50 1.4, F 50 1.7, FA 50 1.4, A 50 2.8 Macro, just recently got the Samyang 50 1.4 and have been ogling the A 50 1.2

help
Forum: Pentax K-1 02-22-2017, 08:02 AM  
BG-5 Battery Grip and Pentax K-1.
Posted By sprint113
Replies: 2
Views: 746
No, D-BG5 is only compatible with K-3 and K-3 II. You need the D-BG6.
Forum: Pentax SLR Lens Discussion 01-11-2017, 02:05 PM  
Mirror lens usage
Posted By sprint113
Replies: 10
Views: 972
Since the lens is a fixed aperture, you shouldn't need to specify that it's f/8 lens, and having the body show f/-- should be fine. It's been a while since I've used my mirror lens, but I think metering will continue to work fine in Av, M and maybe some other modes, setting the shutter speed/ISO based assuming the current aperture/amount of light is coming in is the same as during image acquisition. Setting the aperture should only matter if the body is metering wide open, and then stopping down during the photo acquisition.

That said, there aren't really any modern mirror lenses. Pentax lenses use a pattern of electrical contacts on the lens to tell the body the maximum/minimum aperture so the body knows how much to move the aperture lever in order to achieve a certain f stop. As a result, there aren't any patterns that specify a fixed aperture lens and hence, no fixed aperture lenses will be able to tell the camera what aperture it is. However, as I stated in the first part of this reply, this should be unnecessary.
Forum: Pentax Price Watch 11-17-2016, 09:21 AM  
SMC F*300mm for Auction: No Affiliation
Posted By sprint113
Replies: 10
Views: 1,231
I was that somebody. "Supermoon" Monday ended up being cloudy/rainy, so I picked it up Tuesday. Apparently the department handling the auction was not the one that originally used the lens, so I wasn't able to get the story of why the city owned the lenses up for auction. The F* 300mm turned out to be in pretty good condition and I was able to put it to use immediately. Finally a member of the "star" club.



Moon Rise over the Capitol by imstee, on Flickr
Forum: Sold Items 11-10-2016, 02:51 PM  
For Sale - Sold: Pentax K-3 with extras
Posted By sprint113
Replies: 3
Views: 749
Also interested.
Forum: Pentax K-3 05-21-2016, 11:24 AM  
Pixel shift motion correction in K-3II?
Posted By sprint113
Replies: 23
Views: 4,486
That seems to be correct. I loaded the DNG of PentaxForums' PS sample shot in a hex editor and saw that it was basically 4 Image File Directories holding 4 RAW sensor data. The overall structure was almost identical to one of my K5 DNGs, minus the extra 3 IFDs. I'm not sure if MC was on or off in the sample shot, but I didn't find any means for the body to communicate regions it detected motion to the RAW processor, such as a mask. If MC was on in the sample shot, this suggests that its purely up to the raw processor, either the built in JPEG engine or computer software, to detect and correct the motion.

Since motion correction seems to be a unique feature, there didn't seem to be an entry for it in the EXIF directory in the DNG file, although I didn't check to see if Pentax had overloaded an older/obsolete EXIF entry type. There is also a large block of data in the DNG that is reserved for manufacturer specific private data that I haven't tried to parse, so it's possible I missed something. In the end, if motion detection and correction of PS RAW is done entirely in software, it's likely that the MC setting has minimal to no impact to the RAW data.
Forum: Pentax K-3 05-19-2016, 08:46 AM  
Pixel shift motion correction in K-3II?
Posted By sprint113
Replies: 23
Views: 4,486
This makes sense in that the Pixel Shifted RAW files for both the K-3 II and K-1 simply consist of the 4 shots acquired. The RAW converter then is responsible for merging the 4 files together to make your RGB image. It's really nice that Pentax didn't artificially limit motion correction to the K-1. Of course, motion correction for in-body JPEGs is only available for the K-1.
Forum: Pentax DSLR Discussion 05-19-2016, 08:29 AM  
How can I tell if Pixel Shift Worked ?
Posted By sprint113
Replies: 11
Views: 1,317
The pixel-shifted RAW files, both DNG and PEF, simply consist of the 4 separate RAW images acquired. It is then up to the RAW converter to combine the 4 images into a RGB image. Currently, Pentax's own software is the best at converting pixel shifted RAWs. I believe Adobe Camera Raw can handle Pentax K-3 II Pixel Shifted RAWs, but from what I've heard, it handles motion artifacts poorly. It may also not yet be programmed to handle the K-1 PS RAWs since that camera is quite new. As far as I know, all other RAW converters will only take the first RAW frame, resulting in essentially the same image as if you had taken a regular non-pixel shifted image.

In your case, it's also possible that the conversion from PEF to DNG stripped the all but the first frame; you can double check by seeing if the file size dramatically decreased between the two formats. Meanwhile, for out-of-body JPEGs, the body handles the processing of the 4 images to create the pixel shifted image, so the out of body JPEGs should be properly pixel shifted.
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