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Advice for buying a camera and a beamer

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Advice for buying a camera and a beamer

Postby XYZ » Thu Jan 07, 2016 4:09 pm

Hello Forum
I’m new to David and this forum.

I’m planning to buy a David system and digged myself through the posts on this forum.

I want to scan things between 50 mm and 500mm of height, width and depth.
I don’t need the details of a fingerprint but more a well balanced system.

I favor the use of a DSLR camera as I already want to buy a DSLR for taking pictures so I can kill two birds with one stone.

My ideas til now:

Camera:
Nikon 7200 body, 1.920 x 1.080: 60p (progressiv) livestream
Video grabber card
Which lens would you recommend?
Does a 18-105 mm or 18 - 140 mm lens make any sense or rather a prime lens?
What focal length to avoid distortion?


Beamer:
Acer K132 or
NEC V260X as Curiousjeff has one?
The Acer has a smaller minimum screen of 43,1cm vs. NEC 76cm and a higher resolution of 1280x800 vs. NEC 1024x768.

Are there any problems with the LED beamers, like distortions, interlacing, diamond shape pixels etc.?
I read somewhere in the forum about some problems with the Acer Beamer and a DSLR camera.

Where do I get close up lenses for the beamer?


Any advice would be great!

Thank you very much and happy to hear from you
XYZ
 
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Re: Advice for buying a camera and a beamer

Postby WalterMo » Fri Jan 08, 2016 11:31 am

Hi,
Welcome to this forum.

I couldn't find a Nikon 7200 on this forum by means of the Search Tool top right, but a Nikon D5200 used by Curiousjeff:
viewtopic.php?f=15&t=6624&p=33371&hilit=nikon#p33371

His additional hardware is also listed.

Regarding close up lenses for a projector: I would choose an achromatic lens. It has minimal distortions, also at the edge of the lens. Choose its diameter not too small, the projector's beam is deflected upwards.
Here is a German reseller of good achromats:
http://präzisionsoptiken.eu/achromat-c-24_41.html

Unfortunately this reseller of odds has the letter 'ä' in its name. Maybe it's a bit difficult to find an 'ä' on your keyboard.
Or you go another way:
http://www.macony-design.de/

and then click on 'Rundoptik' and then 'Achromat'.

In this thread you will find additional infos:
viewtopic.php?f=15&t=3471
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Re: Advice for buying a camera and a beamer

Postby XYZ » Fri Jan 08, 2016 3:43 pm

Walter, thank you very much for your help.

I've already seen Curiousjeffs post for the D5200.

Unfortunately the 4-digit Nikon series (3300, 5200, 5500, 7100, 7200) do not support the possibility to change the aperture during livestream.
How (un)comfortable is this when you calibrate the David system?
As I've never worked with David I have no clue if this can be a mess.
Or is setting the correct aperture an easy job?

Are the diamond shaped pixels of the Acer 132 a problem?
Seems like overexposure + diamond can cause some problems, I've read in a post.

The achromatic lenses are very interesting.
I will give them a try when my system is established.



Martin
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Re: Advice for buying a camera and a beamer

Postby WalterMo » Fri Jan 08, 2016 6:07 pm

As far as I know are the so called diamond shape pixels of the Acer K 132 no problem for DAVID. Otherwise the DAVID team would not have chosen this projector as the follow-up type of the Acer K11 for the SLS kits.

I have never worked with a DSLR camera with DAVID. So I hope someone else can give you an advice. Normally the aperture is set one time for the calibration and then not changed afterwards.

Walter
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Re: Advice for buying a camera and a beamer

Postby Curiousjeff » Fri Jan 08, 2016 8:25 pm

I have purchased a new 4k hdmi capture device that plugs into USB3. I will have it in a few days a report back.

The Blackmagic Intensity Pro 4K works very well up to FullHD but not beyond.

The Nikon D5200 goes up to 30 fps. The new Nikons go to 60 fps.

I will also (probably) be buying a Panasonic GX8 as my regular photo camera but will of course test it with David and this new capture device once I have it. I hope 4K will work.

It really depends on your purpose using David, your budget, portability, etc...

I cannot comment on the combination K132 and Davidcam but I was not happy with the combination K135 and Canon D60 using liveview. I could never get the same quality as Narmella with my K135 even though we use the same camera. Maybe it's a problem with my K135 or an electric inteference, or me :? (?).

Jeff
Panasonic GH4 4K with lens 12-35, Inogeni 4K to USB3 hdmi capture device, projectors: Acer K135/Acer K11/NEC V260X, Canon 60D, macro 60 mm, MagicLantern
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Re: Advice for buying a camera and a beamer

Postby mr_cg » Fri Jan 08, 2016 8:33 pm

Just my two cents on this based on my experience ... beginning with Canon EOS 600d and using industrial USB cam.

Projector:
Acer K132/K135 should be really good choice (money vs value). It's very small and light.
Also DAVID is using the K132 for the SLS2 bundle.

Camera:
I also started with DSLR because i already had one. The results in live view are quite good.
The usage of image grabber could further improve scan quality ... BUT: it's more complicated and time consuming than live view.
If you do not already have a DSLR for testing i personally would recommend to buy industrial mono cam.
The handling is much easier (only USB, no additional power, very small and light) and scanning is extremely fast.
It's not only the resolution what is important for good results and have smooth workfow!
DAVID4 Pro v4.3.6 (64bit) - david-cam-3.1-m - IDS UEYE UI-1540-M - Canon EOS 600d (Canon Lens: EF-S 18-135 IS) - Acer K135i Projector + 37mm Close-Up Lens
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Re: Advice for buying a camera and a beamer

Postby XYZ » Sat Jan 09, 2016 4:56 pm

Thank you everyone for your help.

Walter, thank you for your hint for http://www.macony-design.de/


mr_cg
Where did you buy your 37mm Close-Up Lens?
What area does it cover?

Acer K132/K135 should be really good choice (money vs value). It's very small and light.

I think the only difference between these two beamers is the SD card slot at the K135, right?


Plug and play, especially with the David camera, sounds very reasonable.
Having a DSLR camera for some extra benefit like taking pictures as well :-D
That's the conflict I'm currently fighting with.
I have to see what camera it will be in the end.


I have purchased a new 4k hdmi capture device that plugs into USB3. I will have it in a few days a report back.

Sounds very interesting, waiting for your experiences...

I found this one: StarTech USB3HDCAP Video Grabber USB 3.0, but it's only Full HD.
Or this one: epiphan DVI2USB 3.0 which cost 3,5 times more than the StarTech.
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Re: Advice for buying a camera and a beamer

Postby soren » Mon Sep 19, 2016 9:26 am

What is your price range?
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Re: Advice for buying a camera and a beamer

Postby soren » Mon Sep 19, 2016 9:30 am

I have a Canon DSLR and a couple of thousand dollars in high end lenses. Good stuff. Look http://thedigitalcamera.net/canon-eos-5d-mark-iv-the-evolution-of-the-saga/
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