I was using Cannon S100 previously for mapping purpose with CHDK, 1/2000 shutter speed, IS turned off and focus set to Infinity but still get around 50% blurry image.
Please share your Nex 5n camera setting (Auto or manual or shutter priority?) and any experiences, pros & cons using Nex 5n for mapping purpose.
Let me start from what I was reading from some forum (forgot the link):
Sony Nex 5 series Camera Setting for Mapping:
I will update first page regularly that may be useful for others.
Many thanks in advance for your contribution.
That is correct. I haven't used aperture priority, mostly because I want to keep the shutter speed high. I haven't had any issues with manual, so I've continued to use it. I have been lightening up shadows with post-production, but the RAW allows me to shoot in manual without worrying about lighting changes.
You had told me previously that you liked the 30mm - I may pick one up so I can still fly high and get good GSD. I've had some issues reproducing buildings with the 19mm, since I fly fairly low (lots of perspective change).
I am working with an Engineering student at KU to develop a product for drones. Would you be open to answering a few questions about your drone(s)?
Sure thing, feel free to email me at firstname.lastname@example.org
David, do you process the image one by one or do you batch process them?
I batch process by similar characteristics. For example, if half of a set is cloudy, I'll do that half separately, and alter the temperature, exposure, and blacks more than I would otherwise. It's pretty easy to get them close enough that Photoscan can deal with them - I mostly worry about matching amount of green color when doing grass/forested areas. Haven't done as many urban or suburban areas yet.
I've similar questions moving from Canon SX260 to Sony NEX-5.
Like to sum up and please correct me where I'm wrong.
My profile is for a SkyWalker
- 100m altitude
- Sigma 30mm (intended)
main points for me
-5T for low weight, app loadable and reasonable costs
min shutter interval (using a >90MB/s write speed SD)
mentioned here ~1/s for jpeg
What is the max speed for RAW?
I can't see the point why the app with delay and trigger interval time
isn't sufficient? Get rid of what I don't need later on.
Can't remember where I saw this but 900 pics/charge in practice?
I would like to go for a fixed high shutter speed priority like discussed
here already. Seems that RAW and post-processing is the consequence.
By my profile when should I expect to get rid of any blur? My feeling
is going for 1/2000s or even more.
thanks for all the valuable info found in the forum already
thanks for the additional information.
I'll hope that I can go for open aperture with the Sigma 30mm.
Regarding the intervalometer.
As I'm going for large area coverage with a plane
more than 95% of the pictures are useful. Only the
pictures within turns need to be dropped.
For now I'm concentrating on collecting pictures and
do not care so much about post-processing. Friends of
mine do some 3D modelling and yes a home computer isn't
enough. But I hope this scales better over time.
Concerning the geo tagging I did assume that a low number
of GCPs assigned to pix in the stiched image would be
sufficient. But I have to learn what's going on in this
Just sharing my result.
Using Sony A5000, running all manual; manual exposure and manual focus
Set shutter speed at 1/1600 to get good still photo
Set aperture at f/8 to get longer sharp zone (might be better at f/11, haven't tried yet at this small aperture)
Set focus at infinity
Set iso to auto iso (but testing on the ground first to ensure that with above setting the iso won't go higher than 800)
The aim is to get consistent exposure on every photo, use auto iso to anticipate on cloud changing during flight...
I got a very nice consistent exposure, process it on agisoft and none of my photo rejected by agisoft...
Ps: don't forget to put a tape on the focus ring, it moves during flight due to the shaky platform...
can you please complete your info, which lens, AGL, speed?
Using sony 16-50mm set to 16mm, flying 140m agl on 14 m/s (actual speed 12 m/s). Using highest resolution on jpeg (using raw will kill my computer).
Total got 865 photos for 215 Ha area. Post processing took 12 Hours on my monster laptop (core i7 3.2Ghz octacore, 16Gb ram, 4 Gb graphics card).
The photo's exposure is really consistent (usually got slightly darker or lighter between images on Aperture or shutter priority). Focus is a bit blurry due to drift focus on flight (forgot to put a tape on the focus ring), but the post processing result is really satisfying.
I'm using 9 gcp surveyed with static rtk gps.