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Messages - MatthewD

#1
:-)
The slip lamp (the above photo) is a little different, it most often is used to observe the anterior (or posterior part of the eye), often without photography (the price is also 5k-20k).
The light is also a strong "slit" thus a narrow focused line (less blinding)

(I'm not thinking of using the focus bracketing to do stacking)
The reason i believe the focus bracketing will work is that often a photo will be sharp (or even part of the photo is sharp... see the photo above of the iris, certain areas are sharper). The difference between sharp and not is fractions of a millimetre and in the short moment between autofocus and taking the photo there is often a slight shift in the distance. A compounding difficulty is that in some eyes the camera tends to focus on the "skin" (anterior surface) thus forcing the camera to take extra shots near the autofocus point would be able to catch the right focus distance.

Does the code you added in "Reply #4" do anything like what i'm describing? (if yes how can it be added to my ML)

(thanks for your enthusiasm)


#2
Again many thanks Walter and Garry

After multiple tests (on 70D and a new 5Diii), still no success. :-(
It seems to me that a very simple "Focus Bracketing" with a basic and fast burst of "0,-,+" (with ability to set the number and distance between the steps) would be really beneficial...

My specific needs of capturing a persons iris make it impossible to have something that requires setting anything up, ie. tripod, setting the front and back frames... even Live View autofocus is too slow, as the subject is live and in constant movement, yet sensitive to bright light (More light is not an option, thus faster shutter and/or small aperture not possible).
It's a bit like taking a photo of a young fidgety child :-) ... Only something very quick and automatic ... click, click, click in less than a second.
I can think of so many other situations this feature could help get a sharper photo and save the day...

If it's technically too difficult to implement, does anyone know of a camera that has this ability?

EDIT: I'm aware of my low level of experience with ML and that maybe what i'm needing may be possible (if thats the case i'd be very grateful for some tips on how to do this...).
thanks all you guys involved in making ML

#3
thanks for that.
I will have a play with that. If it works it will be nice to have a few very sharp shots...
However, this option is not easy to implement in a clinic setting with a patient present and waiting. The idea is to take a few photos and quickly get them onscreen to start analysis.

I'll try to buy a second hand 700D it may have ML nice and stable on that one. If there are any other cameras recommended that do the focus bracketing really well, keen to hear... Full frame cameras don't seem to add much (DOF not the best for Macro it seems), although haven't tried them with ML... (I'm currently testing the 5Ds, but doesn't add much so going to sell it)

Thank you guys for all the work and enthusiasm.
#4
Hi Walter thank you for you swift reply.
Looking more closely i realise why i'm confused... some of focus features for the 70D are disabled at the current development stage.

This is best result with focus trap... manuel focus without ML (and lots of luck) gets better results... i will either wait or try to get my hands on different camera
Thank you


#5
Not sure if i should start a new thread...
I've been trying (unsuccessfully) to figure out how ML can do "Focus Bracketing" on my 70D.

I take macro photos of the iris (http://www.irislab.com/pages/iris-photos). It's a very difficult task to get the focus just right (The iris moves constantly, is sensitive to light, has a reflective quality, is spherical... to name just a few difficulties...).

Focus bracketing wish:
Without a tripod
step 1) half press : Autofocus
step 2) full press : snap photo "0"
step 3) keep the shutter btn pressed : ML automatically takes 2, 4, or 6 extra photos  -  (0,-,+  or  0,--,-,+,++)

It sounds like you guys are talk exactly about this... Please spare a couple of minutes to explain how to do this in the ML menu.
(I'll make youtube video when i figure out how)
Thank you
#6
Thank you Walter.
I'm still experiencing
- 2) When in liveview and then enter ML menu within a few seconds it automatically jumps me back to the liveview (doesn't happen if i wasn't in liveview)
Can't seem to see anyone else talking about this in the forum --> I can film it if that's helpful

(I know it's a beta, so just giving this as feedback :-) 
I love the work and have been sending btc to share expenses etc ... if i can do anything else, do say
#7
I recently installed for first time ML, am very impressed with it.

Possible bugs :
- I follow install instruction from 1st post (B version)
- Installed all modules
- Played around with some features (can't remember exactly what i played with, but i followed some of the features covered in this vid : https://www.youtube.com/watch?v=au3xaQi-vHo
  1) One of the photos i took had weird color distortions (over exposed + horizontal lines going across) img01 https://www.dropbox.com/s/fmu2ygd9rjtq3w7/ML_img01.png?dl=0
  2) When in liveview and then enter ML menu within a few seconds it automatically jumps me back to the liveview (doesn't happen if i wasn't in liveview)
- Play with the game Arkanoid for couple of minutes
- Then decided i was unlikely to rec video in RAW so uninstalled all the modules that seemed related to that.
- Restarted
  3) Error messages on screen img02 https://www.dropbox.com/s/nem158pu9eug07i/ML_img02.jpg?dl=0  & after remove battery img03 https://www.dropbox.com/s/p1yjy1s39hnb68c/ML_img03.jpg?dl=0
Solution to uninstall ML and copy a fresh version of ML files to SD card and reinstall

I tried to reproduced the bug by simply uninstalling the same modules, but wasn't able to reproduce error msgs.

Anyone else experienced this?