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Messages - garry23

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126
Modules Development / Re: Full-resolution silent pictures (silent.mo)
« on: January 15, 2021, 06:22:30 PM »
@names_are_hard

The median merge function is ‘simply’ (a+b)/2, that is sum the pixel values and half the result. As to how one does it at the pixel level I don’t know, but someone will  ;)

Anyway, for now it’s just a development marker.

Cheers

Garry

127
Modules Development / Re: Full-resolution silent pictures (silent.mo)
« on: January 15, 2021, 02:39:08 PM »
@Grey

Yes I know I can do that and use normal approaches to construct bracket sets for processing in post, eg https://photography.grayheron.net/2021/01/music-additional-notes.html

My suggestion is to do this in camera, ie before outputting the FRSP image.

 ;)

128
Modules Development / Re: Full-resolution silent pictures (silent.mo)
« on: January 15, 2021, 10:25:59 AM »
A Thought/Idea

As we look forward to a 'resurgence' in ML development (fingers crossed and thanks to a1ex's tenacity) I would like to try out an idea, but first the usual caveat: forgive me if others have thought of this and/or tried it.

The idea is to create a pseudo ND feature using FRSP.

I say pseudo as it it will not behave like a true ND, but, with the right approach it should be pretty good.

I'm aware of a similar, frame averaging, feature in the XF IQ4, eg https://www.dtcommercialphoto.com/why-the-xf-iq4s-new-feature-update-makes-it-the-most-average-camera-in-the-world/

Then there is a slightly different approach in the OMD cameras, ie Livebulb.

If my understanding is correct, the current FRSP goes like this:

1. Enable the FRSP module and set shutter to between, say, 0.2 and 15s
2. Using the FRSP module take the FRSP
3. The FRSP module reads out the LV image into an 'image buffer', which takes about 200ms (say)
4. The FRSP module reads out a DNG to the card, which takes many seconds
5. You can now take another FRSP

My 'idea' is to ask the developers if we could implement the following:

1. Enable the FRSP module and set shutter to between, say, 1 and 10s (say). The module will check shutter times and provide feedback re acceptability
2. Using the FRSP module start taking the pseudo ND FRSP
3. The FRSP module reads out the 1st LV image into the 'image buffer', which takes about 200ms (say). This is a dead time in picture taking, which is why one needs the minimum shutter to be relatively long, eg 1-2s, say
4. The FRSP module now takes the next frame and the previous frame remains in the image buffer
5. Once the second frame is taken, the FRSP module merges the current frame into the image buffer, using a simple median statistic at each photosite
6. The FRSP module carries on doing steps 4 and 5 until the ND time is reached
7. The FRSP module reads out a DNG to the card, which takes many seconds
8. You can now take another FRSP or ND FRSP

Photographers will only need to carry a minimum number of NDs, ie sufficient to get into the 1-10s zone, from where the FRSP ND feature will allow them to 'dial in' longer ND times.

As I'm not a developer or fully understand C coding, I'm not sure how practical the above is. However, if it can be implemented, I believe it will give ML another killer (photography) feature, ie similar to the XF IQ4's frame averaging.

129
Scripting Corner / Re: MUlti Shot Image Capture script
« on: January 14, 2021, 11:13:57 PM »
@ArcziPL

Thanks for the feedback.

Hopefully you will try DOFIS and MUSIC out and they will help you with your captures.

Cheers

Garry

130
Scripting Corner / Re: MUlti Shot Image Capture script
« on: January 14, 2021, 03:56:26 PM »
MUSIC now covers people removal and ND simulation :-)

https://photography.grayheron.net/2021/01/music-additional-notes.html

131
Scripting Corner / Re: MUlti Shot Image Capture script
« on: January 11, 2021, 10:15:37 PM »
@Kharak

Quote
Can you link me to some article explaining this practice?

No  :)

As I just thought it up. As I say, it may not work.

The jiggle is simply moving the lens from the point of focus to another point, and back again; ie the image is always taken at the same point of focus. I was hoping that engineering tolerances and mechanical imperfections in the lens MAY shift the image relative to the sensor each time.

The first approach, if you can, is to use handholding to achieve SR bracketing, which will guarantee image to image pixel shifts.

If jiggling doesn’t work, you still have the noise reduction brackets ;-)

132
Scripting Corner / MUlti Shot Image Capture script
« on: January 11, 2021, 02:36:53 PM »
This 'new' MUSIC script is aimed at those interested in taking brackets sets.

This first release covers noise reduction and super resolution bracketing.

Future releases will cover, FRSP bracketing, Zero Noise bracketing, People Elimination bracketing, Hand Held bracketing and Long Exposure simulation bracketing.

You can read about MUSIC developments on my blog at https://photography.grayheron.net/

The latest MUSIC script is always here https://gist.github.com/pigeonhill/7b02d3dcadddbc703940778d74cd7af2?ts=4

133
General Development / Re: Lens Simulator
« on: January 06, 2021, 04:13:37 PM »
LensSim is fully functioning and I would welcome others trying it out.

I wrote it for those that wish to understand their lens, based on knowing the focal length, the aperture, the focus distance from the sensor, the minimum focus distance, the magnification at the minimum focus and the pupil magnification. All fairly easy to obtain.

LensSim then allows you to see how your lens front and rear principal planes and entrance and exit pupils move as you focus.

Remembering that the entrance pupil is the location of the pano pivot point, and that towards the macro end of the lens, the pupil mag effects depth of field. Plus see lens breathing.

Finally, don’t forget my DOFIS depth of field script, which allows you to capture perfect focus brackets and, if you wish, exposure brackets as well.

134
Tutorials and Creative Uses / Re: Any hummingbird photographers out there?
« on: December 31, 2020, 04:07:51 PM »
@Kevinrea

From my experience, shooting them in California and New Mexico, use dialled down flash and several of them, if you wish to freeze hummers’ details.

135
General Chat / Merry Christmas one and all
« on: December 24, 2020, 05:47:48 PM »
Just a Merry Christmas message from a pestilence locked down U.K. 

Plus a great link to read over your holiday break: https://ciechanow.ski/cameras-and-lenses/

Cheers

Garry

136
General Development / Re: Lens Simulator
« on: December 13, 2020, 11:37:24 AM »
Another minor uplift to LensSim, which now shows a representation of the entrance and exit pupils: http://photography.grayheron.net/2020/12/lenssim-12.html

137
General Development / Lens Simulator
« on: December 07, 2020, 11:00:36 AM »
Some may be interested in a little project I've developed to create a Lens Data Sheet.

Here is the latest post on LensSim: http://photography.grayheron.net/2020/12/lenssim-data-sheet.html

138
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 28, 2020, 05:10:32 PM »

139
General Development / Re: Cooled R5
« on: November 28, 2020, 01:12:42 PM »
Quote
Low risk but should be mentioned: Warranty issues apply.

Agree, but, as with those seeking to get their camera IR converted, risk has been assessed  ;)

As for the thermal paste, someone who knows their stuff should be able to verify the amount that is acceptable.

One final thought, when you look at what Canon did inside, relative to the tweak in the video, you have to say, what were you thinking Canon?

Cheers

Garry

140
General Development / Re: Cooled R5
« on: November 28, 2020, 12:56:40 PM »
Quote
I'm keeping my eyes out on Ebay for a $10,000 Modified R5 now.

Based on my initial post, someone with the skills to break open a camera, could make a nice little business doing a conversion, ie just like the IR conversion people do.

Just a thought or hint  ;)

Cheers

Garry

142
General Development / Cooled R5
« on: November 26, 2020, 04:54:14 PM »
I thought some may be interested in this.


143
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 26, 2020, 12:38:16 PM »
I'm pleased to release TiltSim 2, that is a closer emulation of a 'real' T/S lens: http://photography.grayheron.net/2020/11/tiltsim-2.html

145
Scripting Corner / Re: Focus feedback for Photographers and Videographers
« on: November 20, 2020, 12:59:26 PM »
Another addition to DOFIS for TS lens owners: http://photography.grayheron.net/2020/11/dofis-plane-of-sharp-focus.html

146
Scripting Corner / Re: Focus feedback for Photographers and Videographers
« on: November 18, 2020, 03:58:30 PM »
Just added an additional feature for the tilt lens users: http://photography.grayheron.net/2020/11/dofis-tilt-calculator.html

147
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 16, 2020, 04:13:22 PM »
I thought some may be interested in my latest post: http://photography.grayheron.net/2020/11/view-cameras-vs-dslr-tiltshift-lens.html

148
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 08, 2020, 10:02:25 AM »
@tupp

Quote
Okay, but I am not so sure about that.
.

Good luck with your work and photography.

Cheers and over and out


149
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 08, 2020, 07:54:18 AM »
@tupp

Fully understand all you have said and I assure you I know what you are referencing.

As I keep on trying to say to you, the current TiltSim is a simplified model to gain some insight into TS lenses.

Your gif is well known on the web, but you could also have shown the gif showing the hinge in action from front tilt, ie see both here http://www.northlight-images.co.uk/using-lens-tilt-on-your-digital-slr/

All I’m doing in TiltSim is showing the hinge, ie not the Scheimpflug line. That is exploiting the J height from sin tilt = f/J and, of course, focus distance.

I will likely write a 2nd version which better models  the true lens tilt, but it will not change the gross view of things.

Once again, thanks for posting a reply, but I can assure you I know TiltSim is ‘wrong’ ;-), but not so wrong that it’s not useful.

Cheers

Garry

Ps SelectN is used because of how Desmos works. It does select the 1/3 stop aperture numbers, which are shown on the y axis ;-)

150
General Chat / Re: Tilt/Shift Lens Simulator
« on: November 05, 2020, 03:53:47 PM »
@tupp

Once again, thanks for all your feedback.

Bluntly, I think you are looking for more than I was attempting to do here, ie your references are sound for a large format or medium format technical camera user.

For a TS lens on a Dslr, I’m comfortable that TiltSim is doing its job, ie as an tool to help one understand a tilt and shift lens on an Dslr ;-)

Hopefully, my latest post explains my thinking.

Cheers

Garry

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