Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
09-23-2017, 12:01 PM   #1
Senior Member

Join Date: May 2017
Posts: 127
Any chance for using flash in Pixelshift-mode by letting the flash fire like in HSS?

I ask this, because in HSS the flash is said to actually strobe really quickly.

I think it could also work with a simple (P-TTL) flash that is powerful and capable of strobing real quickly... Like the Sigma 610 DG Super... or something alike.
You would only have to get the flash to fire, but when you are in pixelshift, the hotshoe does not do a move... not one.

I already thought about using a Cactus V6II that releases the camera whilst also releasing the flash(that will strobe with about 60Hz)...

If there is anybody with experience in developing cameras and camera firmware, i would love to hear what you think, could this be achieved by a sysparam mod(so a K-70 for instance would release a flash sitting on the hotshoe even if its in pixelshift mode?

or will i have to go the way around with strobing via releasing with Cactus V6II...

I will let you know when i had success... All that just came to my mind a few hours ago... So I did no testing until now, but maybe others also want to take their try on this:
so if i experience any success i will report in here.
Would be nice to hear if someone else tried flashing in pixelshift mode.

09-23-2017, 01:53 PM   #2
mcgregni's Avatar

Join Date: Sep 2012
Location: Surrey, England
Posts: 2,263
I seems like you are really asking about a continuous lighting source .... an LED that stays on throughout the whole exposure sequence of the pixel-shift capture would obviously work. An HSS style xenon flash burst would have to be pulsing for quite a long time. How long does it take to expose a pixel-shift image .... is it 4 times the shutter speed setting?
09-23-2017, 02:40 PM   #3
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 47,036
QuoteOriginally posted by mcgregni Quote
How long does it take to expose a pixel-shift image .... is it 4 times the shutter speed setting?
Yes, with a fraction of a second in between each.

Adam Webmaster (Site Usage Guide | Site Help | My Photography) server and development costs are user-supported. You can help cover these costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

11-12-2017, 05:58 AM   #4

Join Date: Jul 2011
Posts: 1,164
The camera would make sure that the flash provides the same output for a fairly long time or for each sot in a series when using longer shutter speeds. As much as I would like a more flexible implementaion for pixel shift, this would be very tricky to do.

11-13-2017, 12:40 PM   #5
Senior Member

Join Date: Jan 2013
Photos: Gallery | Albums
Posts: 161
With 1 sec exposure time, strobe 40 times at 60 Hz

I've been struggling with a similar problem when wanting to use shutterless lenses.

My current line of thought is to use strobe mode flash and just manual trigger for each subsequent frame.

I'm having a Canon 550EX which allows setting the rate and number of flash firing. When pushing the test trigger (tried with both Cactus V5 and V6) using button continuously, the flash fires for the specified number of shots. I got a combination of 19 Hz and 50 flashes at the power level setting of 1/128. When going to 20Hz and over, the flash allows only 40 fires. As a note, Cactus RF60 also allows multi strobe, but does full multi strobe run with a single trigger signal.

Pixel shift seems to work on horizontal segments - if just popping the flash once at full power, the pixel shifted image receives exposure only on one segment. A bit similar to banding when going over camera's sync speed, however with pixel shift this happens with e.g. 1 second exposure time.

So the problem is finding the exposure settings where the flash is firing while the camera is going through all segments of each consequent exposure, as mentioned by the previous poster, preferably with constant power. Since doing the triggering manually for each pixel shifted frame if the fire rate * flash amount is too close to frame exposure time, it's difficult to time the shots to the right frame.

After some experimentation, with 1 second exposure time, 40 fires at 60 Hz rate seemed to give pretty even light distribution over the segments. This was 2/3 of the exposure time.

Few test shots with D FA 100mm macro and F 35mm-70mm F3.5-4.5. Both shot at f/11 near to closest focusing distance.

On pixel peeping, the pixel shift seems to give a bit more pop, maybe 10-15% more on the sharp areas. However, overall the pixel shifted image is clearly more pleasant to see, especially in the case of the zoom lens. This seems to support the theory that pixel shift gives relatively largest improvements when the lenses are not of the highest quality.

Can you see which one is pixel shifted and which one not?
Attached Images

Last edited by ppohja; 11-13-2017 at 01:42 PM.

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
cactus, customer service, experience, fire, flash, flash fire, flash in pixelshift-mode, hotshoe, mode, pixelshift, ricoh imaging, strobe, suggestion
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Starting to test Godox HSS with Cactus V6ii, HSS works in AV mode? jake14mw Flashes, Lighting, and Studio 6 04-13-2017 07:30 AM
using the K-1 with pixelshift to "scan" medium format negatives/sludes, anyone?? Douglas_of_Sweden Pentax Medium Format 14 11-07-2016 02:49 PM
Acon R930 multi flash setup HSS fun fact using Metz-Canon flash as second unit beholder3 Flashes, Lighting, and Studio 4 03-29-2016 03:29 AM
Pentx k500 not letting in enough light mzmony Troubleshooting and Beginner Help 6 01-19-2016 09:16 AM
Radio trigger for HSS I don't care about P-TTL just HSS. PTTL not neccesary or wanted MD Optofonik Pentax Camera and Field Accessories 11 05-04-2013 03:59 AM

All times are GMT -7. The time now is 10:22 AM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]