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Forum: Troubleshooting and Beginner Help 1 Day Ago  
Is a 'Fast' lens stopped down the same as a 'slow' lens at the same aperture?
Posted By mcgregni
Replies: 33
Views: 972
The more I read this the more I find the terms "fast" and "slow" to be very strange ways to describe maximum aperture openings!
Forum: Flashes, Lighting, and Studio 10-09-2019, 07:17 PM  
Sticky: Comprehensive Pentax Flash Guide
Posted By mcgregni
Replies: 50
Views: 32,873
Things keep moving on in the world of flash, and compatibility with Pentax cameras is increasing. That's a good thing, but it doesn't make things any simpler in terms of choices and options!

I hope you get things up and running easily Les, and please come back to the forum with any questions.
Forum: Pentax SLR Lens Discussion 08-29-2019, 02:19 AM  
Why persist in using legacy manual lenses
Posted By mcgregni
Replies: 156
Views: 7,343
There's good and not so good examples within both the old Manual types as well as newer AF lenses ...... we should try to ensure we get hold of the good ones if we can! For me, on a limited (zero now!) photography budget, my legacy manual focus lenses provide a route to top quality IQ without the expense. In general I have found it important to use lens hoods which can improve contrast, but also I recomend RAW captuure and careful editing to get the best out of the image files with old legacy lenses.


Here's a link to a photo thread of mine on PentaxUser.com, all shot with the M75-150 F4.0 .... I simply can't afford a modern zoom that could come anywhere near these sort of results, and these are taken with a 10 year old camera, the K7 .....


Kensington with the M75-150
Forum: Troubleshooting and Beginner Help 08-28-2019, 03:52 AM  
K-x flash question
Posted By mcgregni
Replies: 2
Views: 375
The max sync speed on the aps-c Pentax models is actually 1/180th sec, so a basic manual radio trigger will not send a fire signal beyond that setting.
Forum: Flashes, Lighting, and Studio 07-10-2019, 03:37 AM  
Three flash setup Pentax K-p, Yongnuo YN560 III and IV , AF540FGZ II
Posted By mcgregni
Replies: 14
Views: 880
Good idea Clackers, but even I myself back away from referring people to them now.

Reading up and studying things in a written format is seeming more and more like a lost art. It's my impression that the vast majority of newer people here really just want to find out things from YouTube videos. And also they often only want to see a video that answers their exact specific concern, and generally are not interested in a written guide that builds an overall solid base of knowledge.
Forum: Flashes, Lighting, and Studio 07-09-2019, 12:56 AM  
Three flash setup Pentax K-p, Yongnuo YN560 III and IV , AF540FGZ II
Posted By mcgregni
Replies: 14
Views: 880
Yes, the term "channels" is probably most commonly associated with television networks, so it's not surprising that it only adds to any assumptions about how the flashes communicate.

"Wireless Channel" as a setting reference does not include a definition of exactly what the communication technology is, so it can be used for a range of system types. It's just one of those things that needs some pre knowledge or research before diving in and using the equipment.

We don't have any documentation to guide us that I'm aware of, but my assumption is that the channel setting must be included in every pre flash as part of the coded optical signals, so that only those flashes set to the same channel will react to those pre flashes.
Forum: Flashes, Lighting, and Studio 07-07-2019, 11:53 PM  
Three flash setup Pentax K-p, Yongnuo YN560 III and IV , AF540FGZ II
Posted By mcgregni
Replies: 14
Views: 880
"Epic" fail....? I'd say there's been a few even bigger ones reported here over the years....:lol:
Forum: Flashes, Lighting, and Studio 07-07-2019, 05:30 PM  
Three flash setup Pentax K-p, Yongnuo YN560 III and IV , AF540FGZ II
Posted By mcgregni
Replies: 14
Views: 880
We certainly don't have "WiFi" as a control technology for flashes with our Pentax cameras, that's right Inkista. It's likely I think that the OP is confusing the terms WiFi and Wireless, and has not considered the matter of flash communication technologies or read up on it.

I think we need to be told exactly how the flashes are being triggered, ie if its an on-camera flash then what one exactly, and what wireless mode is set. The fact that he did not specify this suggests he did not appreciate the significance of the on-camera flash settings.

It may also be that he believed the communication to the flashes is provided by a (non existent) internal radio system, and not by the optical signals from the camera flash.
Forum: Flashes, Lighting, and Studio 06-29-2019, 12:23 AM  
Cactus RF60x Wake Up?
Posted By mcgregni
Replies: 29
Views: 1,169
Unfortunately they don't respond to radio signals to wake up. You can press any button on the flash unit to wake it up..... I usually use the Next button. All settings remain unaffected, and you have options within the menu to adjust the sleep timeout setting.
Forum: Flashes, Lighting, and Studio 06-19-2019, 12:36 AM  
Wireless Trigger Pentax K-r & YN585EX
Posted By mcgregni
Replies: 9
Views: 912
The on camera wireless flash mode should not be a factor here.... In theory both master and control modes should work OK to trigger the slave flash.
Forum: Flashes, Lighting, and Studio 06-18-2019, 04:03 AM  
Normal HSS vs Powersync on RF60x
Posted By mcgregni
Replies: 24
Views: 1,049
Power sync mode with the V6ii is to allow you to use non HSS flashes beyond max sync speed..... A poor man's HSS!

But as already explained by the others, in certain configerations and set ups it will produce more output, although with possible banding or uneven coverage.

It is a function of the radio triggers, not the flash. By definition there is no power control in the mode, as it automatically sets max power..... The flash level is controlled using other parameters, ie aperture, ISO and distance. Therfore it is not as convenient or easily manageable as HSS.

There's not much point to it when using an HSS system IMO..... You've got a V6ii and RF60x, so you're not a poor man!!
Forum: Flashes, Lighting, and Studio 05-30-2019, 03:36 PM  
Need help with HSS on my Godox V860ii & X1 T2.4G
Posted By mcgregni
Replies: 8
Views: 590
And there was me thinking all this time that HSS off camera was only complicated with Pentax cameras! :D
Forum: Flashes, Lighting, and Studio 05-17-2019, 01:32 PM  
AF360FGZ II --or-- AF540FGZ II for K-1
Posted By mcgregni
Replies: 6
Views: 723
You might find this online tutorial I did with the Pentax "540" flash and HSS interesting ....


A Practical Look at High Speed Synch
Forum: Flashes, Lighting, and Studio 04-07-2019, 03:31 AM  
YONGNUO YN585EX Wireless Camera Flash
Posted By mcgregni
Replies: 45
Views: 7,001
When combined with good user knowledge and some experience, the ancient P-TTL system can produce excellent consistency and reliable results. ... But of course, I agree with ClassA that we need to understand and work within its liimitations.

Thanks to the Cactus XTTL system I now enjoy this excellent consistency and reliable fine control even with multiple off camera flashes in P-TTL mode.

I also mostly use M camera mode combined with P-TTL in order to gain the needed control over ambient and flash exposure levels.
Forum: Flashes, Lighting, and Studio 03-14-2019, 02:36 PM  
Xpro-P TTL Wireless Flash Trigger for Pentax
Posted By mcgregni
Replies: 264
Views: 25,889
Glad to hear the Slow Speed Sync can work with the trigger and AD200. Its an interesting "flash mode", because it is not a mode that affects the flash really at all, but rather the camera behaviours. My understanding is that standard "Flash On" mode is really designed for simple flash only scenes, ie where there is no real attempts to balance ambient and flash light, or outdoors in daylight then only for the most basic fill-in situations. The shutter speeds are related to lens focal lengths and designed to avoid camera shake, assuming handholding. So it is sort of "snapshot" mode. Indoors in low light this mode can produce the typical "party" snapshot look, with bright flashed faces and dark surrounds.


Slow Speed Sync assumes that the photographer wants to take more control and combine a mix of ambient and flash exposures, well suited to indoor events or the classic low light portrait outdoors with a city skyline in behind. The camera manual now warns us to ensure the camera is steadied or on a tripod, as shutter speeds will likely not be hand-holdable.
Forum: Flashes, Lighting, and Studio 03-14-2019, 02:24 PM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
Yes, its good to acknowledge that flash output combines with ambient brightness, so the two are effectively slapped on top of one another. And there is a risk of blow out where flash is introduced on top of, for example, an already naturally bright face ..... however, I wonder if it may be over-promoting the sophistications of our P-TTL metering system a bit too far to suggest that the system can recognise when a flash cannot reduce its output sufficiently, and consequently take a decision to use shutter speed (if allowed) to reduce ambient to a level that would allow the flash to expose correctly ...? That does sound rather far fetched, however of course there's no proof about this as we lack any technical information about this sort of thing.


It sounds to me more like the sort of considered and assessed decision a photographer would have to make when finely tuning things using manual mode!
Forum: Flashes, Lighting, and Studio 03-14-2019, 10:52 AM  
Xpro-P TTL Wireless Flash Trigger for Pentax
Posted By mcgregni
Replies: 264
Views: 25,889
For these modes, if needing to free the shutter speed restrictions then switch the Camera Flash Mode to Slow-Speed Sync.... this is most effective indoors and in low light to create a true balance of ambient and flash exposures.
Forum: Flashes, Lighting, and Studio 03-14-2019, 10:43 AM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
Peter is right with this; its important to keep emphasising that exposure time does not influence the flash exposure level in normal operations .... only in HSS mode will exposure time have an effect on flash exposure.


If the meter detects an overexposure situation even though the flash would output its lowest possible level, then it would need to adjust another variable, ie aperture or ISO, in order to allow a good flash exposure. Which of these varies would depend on the mode of course, and whether ISO is available to vary (auto-ISO parameter settings).


If the need is to reduce flash exposure, and the flash is already at its lowest possible output, then in Av mode the camera only has one thing to vary .... ISO, which would have to be lowered. The only alternative is for the photographer to step back more and increase the distance, then try again with a new pre-flash and test shot.


Regarding shutter speed auto control, then this is determined mainly by the camera flash mode setting and the lens focal length. The system aims to provide a steady handheld shot as the first requirement, and in dim conditions this will result in a poor ambient/flash balance, unless the photographer overrides this with Slow Speed Sync mode.
Forum: Flashes, Lighting, and Studio 03-13-2019, 04:07 PM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
Having a flash ready signal going to the camera through the hotshoe changes everything. The metering system has to decide whether it tries to balance ambient and flash exposures, or whether the flash is going to provide everything.

This depends of course on what restrictions on ambient exposure are being imposed by the program line and ISO parameter settings. The Camera Flash mode and lens focal length will likely have the most impact in practice though.
Forum: Flashes, Lighting, and Studio 03-13-2019, 03:08 PM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
....


Bruce, be fair please, this is what you told us in your first post, so I think we should be forgiven for understanding you are trying to use Av with Auto-ISO.
You may have said you had changed it later, but the posts are quite long, so its likely that people are responding to the opening one primarily.


No one is denying that its not possible to get some good flash shots using Av with P-TTL modes .... I use that sometimes myself too. But I agree with Steve that it is more suited to "snapshots" .... it is not suited to any situation where we need to take full control over the mix of ambient and flash brightness that is recorded. Whether results in dynamic situations using Av / P-TTL can be more than snapshots really depends on the skill and creativity of the photographer I feel.


Don't forget to check out the impact of the Camera Flash Modes, which can have a major influence on the amount of ambient light allowed to be recorded.


You asked about why the Auto ISO figure was not displayed prior to taking flash pics .... well, its because the figure is not calculated until the pre-flash. And there will be different decisions made based on a range of factors .... camera flash mode, focal length, amount of ambient light are a few of them.
Forum: Flashes, Lighting, and Studio 03-13-2019, 07:09 AM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
I keep on with the same mantra over and over, in any Flash threads that concern automated exposures and auto -ISO .... If we want full and secure control over the images (and Professional work always demands this, regardless of the scenario), then we cannot rely on auto exposure parameters in addition to our P-TTL flash levels.

P-TTL itself, by itself, is a good thing and a useful aid to efficiency, but only when its the one single variable to focus on. Automated flash metering needs a solid, fixed base in terms of the ambient EV, not the least in order to allow the photographer to see clearly the precise effect of their compensation adjustments. Trying to view and assess the impact of multiple automated setting responses, as well as juggle two independent compensation inputs ....well, it's all too much and bound to lead to confusion and inconsistently exposed shots.

I do agree that it's good thing to have a basic underlying knowledge of the key aspects of what the automated systems are trying to do, and what they respond to .... That's why I wrote sections in my Guides that cover Camera Flash Modes, the impact of focal length, ambient brightness, program line, auto-ISO parameters etc. But to understand these basic principles is to ultimately appreciate the liimitations of such an automated approach to what is a very complicated thing; the balance of light and darkness in a scene, and the creative desires of the photographer who needs to take control of that scene and produce an image that records a precisely controlled mix of ambient and flash exposures.

No tiny camera computer brain can do that
Forum: Flashes, Lighting, and Studio 03-13-2019, 04:23 AM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
The camera flash modes are also detailed in a special section early on in the main Guide document (2nd edition). Worth having another stab at understanding it really ...... Honestly, most of your forum threads here are way more complicated than my guides!!

Anyway (and you always knew this was coming!), you asked for the pro view on this. Well I'm not a pro, but I am very sure that the pros wouldn't even be bothering to think about any of this ..... They just wouldn't care .....

Ok, deep breath, here it comes again..... When trying to control and mix ambient and flash exposures, use Manual camera mode and fixed ISO.
Forum: Flashes, Lighting, and Studio 03-13-2019, 03:49 AM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
No, the Camera Flash mode, on your camera .... That is the important setting that influences automated ambient exposures in these circumstances. Still recommending you read up the Supplement section of my guide.
Forum: Flashes, Lighting, and Studio 03-13-2019, 02:53 AM  
Pre readings differ from Post Playback EXIF under these conditions... what gives?
Posted By mcgregni
Replies: 29
Views: 1,176
As has been explained already, what you see on the screen or viewfinder before firing is not what you will get, because the automated aspects of the exposure settings are not calculated until the pre-flash.

Bruce, you're forgetting about the most important setting here ... What is your camera flash mode. ...?

Don't forget, most of this is covered in my Supplement PDF guide, a whole section on automatic flash photography.
Forum: Flashes, Lighting, and Studio 03-13-2019, 12:36 AM  
3rd Party Flash for Pentax that HSS in Manual Mode (from the hot shoe)?
Posted By mcgregni
Replies: 63
Views: 2,885
You're spreading the confusion Bruce! :lol: I knew this would happen once Godox started to offer more options

Whatever you do I would strongly suggest you go for the neatest, single system choice, and avoid things like trigger stacking and sync cables connecting things etc. Out and about with all your modifiers and stands and handles and stuff, there's more than enough to set up already!
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