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Forum: Pentax Medium Format 10-30-2017, 10:58 PM  
645Z sync speed issues
Posted By Pablo Villegas
Replies: 22
Views: 2,901
I have the same problem with the 645D, I’m forced to use 1/100.

But like they mentioned earlier, it must be the radio trigger. I haven tried a sync cable. I can live with 1/100 in studio.
Forum: Pentax Medium Format 10-20-2017, 05:20 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Thanks!

---------- Post added 10-20-17 at 05:20 PM ----------

People & Portrait | Flickr
Forum: Pentax Medium Format 10-16-2017, 12:11 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
I finally did my first two sessions in my new studio.

The Pentax 645D is an excellent camera in studio, the detail and color are amazing, but I do need new lenses, all I have is the 75mm and 200mm FA lenses, and feel kind of limited by them. I think I’m gonna have to buy the 80-160mm right now FA version. And wait till I have the money for the 150mm 2.8 and 120mm macro. I do have a A 150mm 3.5. But it’s manual focus and I’m having a very hard time focusing with this focusing screen, so I’d rather buy FA lenses.

And I think I made my choice, I’m getting a 645Z, all I need is the higher ISO quality and a bit of more dynamic range for location and outside shots. In the Studio the 645D is amazing.

Thanks to everyone who replied to the thread.

And if they have any input or critique abot the photos, it is, of course, welcomed.
Forum: Pentax Medium Format 10-16-2017, 12:01 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090


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Forum: Pentax Medium Format 09-18-2017, 12:30 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Forum: Pentax Medium Format 09-16-2017, 12:32 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Forum: Pentax Medium Format 09-15-2017, 04:41 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Forum: Pentax Medium Format 09-15-2017, 03:24 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Thanks again everyone. My first studio session got pushed back and back, I only did it yesterday and just Color corrected and retouched the first photo. In the end it was just a regular shoot with some friend actors. Nothing special. And I was kind of rushed... I wanted to try more lighting solutions but in the end it was just regular lighting, softboxes and beauty dish.



I'll post more images later
Forum: Pentax Medium Format 09-06-2017, 05:40 PM  
Canon EF Mount lens on a 645??
Posted By Pablo Villegas
Replies: 14
Views: 757
645 A lenses are very cheap, and most primes are not that heavy or big, the zooms are another story.
Forum: Pentax Medium Format 09-06-2017, 12:16 PM  
Like to see Images shot with ISO 800/1200 on 645D
Posted By Pablo Villegas
Replies: 4
Views: 777
Only personal stuff, nothing profesional.

ISO 800 wide open



---------- Post added 09-06-17 at 12:19 PM ----------

ISO 1600 wide open F2.8



---------- Post added 09-06-17 at 12:20 PM ----------

ISO 1250 wide open F2.8.

Forum: Pentax Medium Format 09-06-2017, 12:05 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Hi and thank you all, sorry, Ive been rather busy this week.

My reason for thinking of moving from Pentax is that I run into a lot of problems trying to do certain things, like working thetered, using the camranger, and HSS, although doable with the 645D and Z. It doesn't work as good or as easy as the other brands, it works with some strobes and not others, with some cameras and not others, and in my case it requires to stack two triggers on top of the 645D, already a big camera, so with the XT1 and the Cactus V6ii stacked on top it's annoying and bulky. I could buy another Cactus V6ii for every light I own, but that's expensive and silly.

And finally, Pentax is almost non existent in Mexico, everything is double the price and service is hard to find and slow.

But the thing I care about the most is image quality, which encompasses Dynamic range, Color depth and Resolution with usable high ISO.
That's why I'm asking, I've never even used a D810. If the IQ is similar to the 645Z, will it make sense changing to that system, for overall compatibility? But that's only if I get very similar quality. Sadly there's no rental market here to test the cameras, and I can only do it at the shop, which is not ideal.

Thanks again.
Forum: Pentax Medium Format 09-02-2017, 11:35 AM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Thanks!

This is what I'm affraid with the 645Z, that I won't be able to do some things with flash and HSS, I was unaware that HSS only works with AF lenses, I have a Cactus V6ii for the 645D, but have never tried to use it with manual lenses, only the 3 FA I have and found no problem in my limited testing.

I do love the feel, the sound and even the weight of Medium Format, I shoot a lot of Medium Format film for personal stuff, but it's very expensive, per picture. I would love to stay in Medium Format digital, but I'm affraid I will be limited by some things, like I am now with the 645D. And going the GFX route is more expensive for me. I would need to spend just $6,500 for the body. Having to sell my 645D and lenses just to get a single lens or maybe two. The only reason I have a 645D is a found a bargain here in Mexico, a 645D body(3,000 actuations) and 3 FA lenses (45mm,75mm and 200mm) for $1,500 USD.

That's why I'm considering the 645Z, it will be the least expensive for me, since I only need the body and two relatively cheap lenses(120mm Macro, 150mm 2.8) around $700 USD each.

I have a lot to think, but have the time to do it, I still need to see if I can make it into the market and if it's worth paying that much in gear. For my personal work I would keep the 645D and add a FF 35mm, and keep shooting all of them.
Forum: Pentax Medium Format 09-01-2017, 09:16 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Thanks, that's a movie. So in cinema you always light everything so it doesn't looke lit. You tend to have minimalistic lighting in new indie cinema. You always use available light when you can. That's not necesarily what I'm gonna be doing with portrait and headshots on still photography. I'm gonna have my first real session on still photography on Tuesday, I'll post some pictures later in the week, of what I intend to do with stills.

Btw, that movie was shot at T2.8 in interiors and night exteriors T5.6 in day exteriors. Very rarely I used T1.8 or T2.0. Never lower than that. It's hard pulling focus at 1.8, at 1.3 it's impossible.

This is similar of what I intend to do with still photography, but more professional, that's just mostly family and vacation photos. https://www.flickr.com/photos/32577294@N06/albums/72157677713676872

---------- Post added 09-01-17 at 09:33 PM ----------



Thanks, that's something I really haven't thought of, aspect ratio... the digital cinema cameras I use are either super 35mm 24.89 mm 18.66 mm (4:3) but you never use the whole sensor for final delivery, you'll use 16:9, 1.85:1 or 2.40:1 or close to that. Or use a Vista Vision Sensor, 40.96 mm x 21.6 mm, again, with a wider aspect ratio. So I guess I'm used to wider aspect ratios, but never really tried to compose for 4:3 or 3:2 in profesional work. I need to think about that.

Yeah, I want the Pentax 645Z for that better DR nad better low light images. But I also get that form the Nikon 850 or 810. I guess I just need to know if there's any difference between the Nikon and the 645Z in image quality, other than resolution.
Forum: Pentax Medium Format 09-01-2017, 05:44 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Thank you very much everyone!

I'm choosing to buy both the 150mm 2.8 and Macro 120mm because they both serve different purposes, the 150mm gives you shallow depth of field and it's less sharp, specially wide open. And the 120mm macro is super sharp. You can use it on male clients. And the 150mm on females.

I would like to go with AF lenses, because I have a hard time focusing manual on the 645D. Unless I'm on a tripod and the subject doesn't move at all, but specially wide open, you'll get around 2-3 inches in depth of field on a headshot, if the subject moves a little bit you can miss focus and judging focus on 40-50MP on such a small viewfinder is hard
I don't own or have even used a FF 35mm DSLR, all I have are two APS-C cameras, both with autofocus(Canon T1i and Fuji X100). So I don't know how is the manual focus on an optical viewfinder in that sensor size. Maybe using live view on the 645Z or on the Nikon 850 is a good way to judge focus. But I don't have that on the 645D, so don't know.
Although I haven't used a Zeiss still lens, other than the old Hassy V lenses. I have used them in numerous ocasiona in cinematography, the last film I shot I use vintage Zeiss High Speeds(T1.3). Stills from that film, taken from the footage. Las Reglas Del Rey Stills | Flickr

I loved those Zeiss High Speed, they're incredible with high resolution digital cinema cameras. But in cinematography it's different, you want lenses with more character, new Zeiss lenses are too sharp for most of what I shoot. I prefer Cooke S4 lenses. But I have used the Zeiss Ultra Prime and Master Primes on many occasions. But I'll definitely test the new Zeiss still lenses if I get the Nikon.

I know the K1, is excellent and every bit as good as the Nikon 810, in picture quality. But the only reason to move away from Medium format is because of ease of use and compatibility. I hate having to look for ways to use HSS, and use something like cam ranger, or even work thetered. And most solutions and pretty cumbersome or expensive.

That's the only reason I would use a FF 35mm DSLR for convenience. And I would chose Nikon for IQ over a Canon.

I have three months to make a decision, I'm getting paid a TV series I'm shooting right now, and I'll buy it with part of that.

PS: I tested the Fuji GFX, and it's a great camera, but it's more expensive, and I would have to sell my 645D and lenses to buy the body and 1 lens or maybe two. And I don't know how much improvement there will be from a 645Z which will be cheaper for me.

Thanks again, and if you have some more suggestions or comments, please leave them.
Forum: Pentax Medium Format 09-01-2017, 12:20 PM  
"Upgrading" decision, Pentax 645Z or Nikon D850(810)
Posted By Pablo Villegas
Replies: 60
Views: 5,090
Hi, I really don't know what to choose.

I currently own a Pentax 645D, and although it has great resolution and image quality in general, I do feel limited by the dynamic range and ISO performance. Being a professional cinematographer, I'm used to 15 stops of dynamic range and at least ISO 800, although I can use up to ISO 2000 with great results in some cameras.

I'm not a profesional photographer right now, I don't make any money from stills, but I want to change that, I'm currently creating a portfolio of portraits and headshots, to see if I can make some money on that front. Cinematography right now in my city has stalled for the moment.

Like I said, the 645D is a great camera for the studio, with controlled strobes, but when you shoot on location, either inside it's hard controlling ambient light at ISO 100 or 200 with an aperture of 5.6 at the most, for depth of field or lenses that don't open more with sharp results. And going to ISO 400 or more loses DR and sharpness. And outside the DR is too limiting, you only have about 1.5 to 2 stops on the high end, so you need to expose for the highlights, leaving the pictures looking underexposed and hard to judge on the LCD, specially the focus or even see anything at all in sunshine.

So, I want to upgrade to something with more DR and better low light picture quality. So a CMOS it is. I'll have around $7,000 USD to spend, so that's only leaves the 645Z, because I will only need the body and a 150mm 2.8 and 120mm macro, I have all the other lenses I'll need. And I'll buy the body used, I've seen it around $4,500 -$5,000.
Or a Nikon 810 used with the 70-200 used and an 135mm f2 and an 85mm 1.4 or even 1.8. Or a new Nikon 850.
I can even go with a Nikon 610 and more lenses for that price, but I'll be losing about half the resolution.
The other big advantage of Nikon is the possibility to use HSS without the use of third party unreliable triggers.

So, what are your opinions on what should I buy? I'm not considering Sony, because I know nothing of it's models and lenses. But if you have any suggestion, please do so.

Thanks in advanced for any suggestion, or reply.
Forum: Flashes, Lighting, and Studio 04-14-2017, 08:01 PM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
Well, what I said is that indeed it should remain constant regardless of the shutter speed, unless you have a higher speed than the flash duration, in which case, it should be underexposed a bit.

But it's a given flash exposure doesn't change a stop by doubling the shutter speed.

I'm gonna do a test this weekend and post the results here, HSS and out of sync flash.

But basically if the full flash duration, which is a full flash exposure, fits into your shutter speed in sync or not, the exposure should remain constant, because the flash power doesn't change.
Forum: Flashes, Lighting, and Studio 04-14-2017, 05:39 AM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
I never said that, I said going to 1/125 which is this camera sync speed, overexposed the image by almost 2 stops from 1/200 of a second or faster.
But that's because the flash is not really full power in HSS mode, it can't be, it needs to pulsate very fasts so can't maintain a full power burst, what's the recharge time at full power? Like 3 seconds, it couldn't pulsate at full power, it must be around 25% power at HSS, and that's why the exposure changes.

Moving shutter curtains and HSS work like this. Let's say at 1/250th, both curtains are moving at 1/1000th of a second to cover the complete exposure, so the flash needs to pulsate 4 times at 1/1000th of a second, that will cover the whole sensor and curtain movement and will give you a correct 1/250 exposure time. So, even if the flash is out of sync with the curtains, you will get a correct exposure every time, even if an incomplete time, if your falls I able to maintain a higher than 1/1000 of a second duration time.



So, same exposure will be maintained as long as the flash duration is higher than the partial shutter curtain time, if I'm seeing the same expossure from 1/200 to 1/1000 it means this flash must have a flash duration of at least 1/8000 of a second, correctly exposing 1/1000, even if it's a partial exposure(not complete frame). And yes. The Godox fastest duration is 1/10000 of a second.

You can see here, that the flash exposure doesn't change between 1/3200 to 1/8000 of a second, only the ambient light. And he does need to compensate 2 stops, to ISO 400 to use HSS, instead of ISO 100 without HSS, that's exactly what I'm experiencing.














Youtu.be




And it has nothing to do with TTL or automatic exposure of any kind, you can't even use TTL with the Cactus V6ii right now.
Forum: Flashes, Lighting, and Studio 04-13-2017, 08:04 PM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
Don't know how HSS or hypersync work, but shutter speed on normal flash does not affects flash exposure. Unless, like I said before, your shutter speed is faster than the flash duration, not my case with 1/400.
It doesn't matter that the slit gets smaller and smaller, it still gets whatever the shutter speed is of time or exposure(light), so, as long as the flash fully triggers in less than that time, it should fully expose the sensor or film just as much as in any slower shutter speed.

And like I said, is not only the exposure that changes, it's the flash output, as you can clearly hear the flash sound louder at sync speed or below. So, HSS in this setup must be limiting the flash output.

PS: after reading how HSS works, it does need to limit the flash power, since it emits extremely fast pulses of light, so it cannot be full power, or it wouldn't keep up with the speed.
When using HSS with my setup, the flash exposure doesn't change when increasing the shutter speed, at least not from 1/200 to 1/1000 the fastest I could test it today, it only changes when going to 1/125, because it allows the flash to trigger at full power, slower than 1/125 doesn't change the flash exposure from 1/125 as well,
Forum: Flashes, Lighting, and Studio 04-12-2017, 09:03 PM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
I don't see why the flash output will vary with shorter shutter speeds, unless you get to a faster speed than the flash duration, which will prevent the flash to fully expose the frame.

But is not only about that, I mean from 1/125 to 1/400 there shouldn't be any change at all in exposure with normal flash output. The flash is doing something to limit the power in HSS mode, because you can hear it as well, the pop from 1/125 is a lot louder than from 1/400. And the image is more than 1 stop overexposed.
Forum: Flashes, Lighting, and Studio 04-11-2017, 09:28 AM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
I did some quick tests the other day, and it just works, Settings on the Cactus V6ii are Flash Canon, HSS normal, camera Pentax. And the Xt1-C is set to manual. Camera set to manual, once you go beyond 1/125 of a second, it will trigger the flash in HSS, it will also limit the power, once you're at 1/125 you get a lot more power like more than 1 stop, your flash exposure shouldn't be changing with the shutter speed, but it does, you need to close between 1-2 stops. Don't know if it's true HSS. But it does fire and synchronizes past 1/125 of a second.
Forum: Flashes, Lighting, and Studio 04-06-2017, 06:01 PM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
No, no leaf shutter lenses. If I had leaf shutter, or if they were leaf shutter lenses for this camera I wouldn't need a Cactus V6ii.

This is the only picture I have now that proves it, it was my test of the system. You can notice the 1/400 of a second and flash fired, it's bounced at the ceiling. This was at night. I don't have any other picture right now, but I'll upload some more when I have time.

Sorry, here is the link so you can see the camera info.
https://www.flickr.com/photos/32577294@N06/29861161005/in/dateposted-public/
Forum: Flashes, Lighting, and Studio 04-06-2017, 01:01 PM  
Pentax HSS with Cactus V6ii and Godox Witstro AD360 Flash Light Speedlite
Posted By Pablo Villegas
Replies: 89
Views: 9,202
That's not accurate, there's no way to manually turn on HSS on the Godox AD360II flash, and the Cactus V6ii triggers it when ever you set a speed higher than normal sync on your camera. That works at least in the Canon version with a Pentax camera.
Forum: Pentax Medium Format 04-01-2017, 09:13 AM  
645 lens suggestions
Posted By Pablo Villegas
Replies: 11
Views: 823
The 45mm is good for landscapes because you can only use it stopped down. It's very soft wide open or even at 5.6.
Forum: Pentax Medium Format 03-27-2017, 06:56 PM  
How often do you use your D or Z handheld?
Posted By Pablo Villegas
Replies: 36
Views: 2,628
This!

You're no longer limited to 1/125th of a second on the Pentax 645D or Z.

And Catus V6II just updated the firmware and you can actually use TTL now with Pentax and other manufacturer strobes.
Forum: Pentax Medium Format 03-20-2017, 09:11 AM  
How often do you use your D or Z handheld?
Posted By Pablo Villegas
Replies: 36
Views: 2,628
I shoot the 645D handheld 99% of the time. All outdoors and nothing professional.
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