From: David J Taylor on
SayWhat wrote:
[]
> You can't use a digital SLR for this because they can't provide the
> live-preview signal, they can only provide an after-view of what
> you've already shot.

Actually, now they can. Check, for example, the Olympous E330 and E410 -
DSLRs whch can provide live preview.

http://www.dpreview.com/reviews/olympuse330/

http://www.dpreview.com/reviews/olympuse410/

David


From: J�rgen Exner on
runcyclexcski(a)yahoo.com wrote:
> I need to set up a digital SLR on a stand to take images of relatively
> small objects (say, 2 by 3 inches). The camera is set up above the
> surface of a table, with the lens pointing down. I want to place small
> objects on the table and take pictures using a cable switch. Since the
> camera is set high above the table surface I can't see the LCD
> viewfinder to focus/zoom, so I want to hook up the camera to a PC with
> a USB cable or smth to stream the image to the comp's monitor "in real
> time" (a ~0.3 sec response time is OK) to be able to zoom, focus and
> then take images.
>
> Is there an SLR that can do that (real-time image streaming)?

No. But why don't you simply use an angle viewfinder, e.g.
http://www.bhphotovideo.com/c/product/357239-USA/Nikon_4753_DR_6_Right_Angle_Viefinder.html?

> What lens would you recommend to be able to image ~2 by 3 inch
> objects, with some zoom capabilities (if the object size increases/
> deacreases by a factor of 2).

Any decend macro zoom lens should be able to do that. As you don't say which
camera you are using it is pointless to point out a specific lens.

jue


From: SMS on
SMS wrote:
> runcyclexcski(a)yahoo.com wrote:
>> I need to set up a digital SLR on a stand to take images of relatively
>> small objects (say, 2 by 3 inches). The camera is set up above the
>> surface of a table, with the lens pointing down. I want to place small
>> objects on the table and take pictures using a cable switch. Since the
>> camera is set high above the table surface I can't see the LCD
>> viewfinder to focus/zoom, so I want to hook up the camera to a PC with
>> a USB cable or smth to stream the image to the comp's monitor "in real
>> time" (a ~0.3 sec response time is OK) to be able to zoom, focus and
>> then take images.
>>
>> Is there an SLR that can do that (real-time image streaming)?
>>
>> What lens would you recommend to be able to image ~2 by 3 inch
>> objects, with some zoom capabilities (if the object size increases/
>> deacreases by a factor of 2).
>
> Sounds like you need a Zigview S2, a computer with a video-in jack, plus
> an autofocus lens with a motorized zoom. While these are common in C
> mount, you can't use these lenses on an SLR.
>
> You could try one of the old Canon EF 35-80mm f4-5.6 Power Zoom lenses,
> and modify it so you can control the zoom motor buttons remotely via
> wires connected to the two buttons (this is the hard part).

Actually, a better way might be with a fixture that holds two solenoids
that press the buttons down. These could be controlled from a PCI relay
board.

If you can live with a high-end point and shoot, with remote control
software, it'll be a lot easier, and a lot cheaper, than trying to jury
rig something with a D-SLR, plus the software is readily available. The
really hard part with the D-SLR is that their are no lenses with remote
control zooming, and in fact almost no lenses with even motorized zooms.
The live preview is not hard to simulate with Zigview, but it's costly.

Look at "http://alkenius.no-ip.org/Cam4you_remote/".
From: runcyclexcski on
I did some research based on what you said, and, indeed, I can not do
it with an SLR, unless I am ready spend multiple $Ks. The Sigview is
interesting, but that device is ~$500 by itself. I would like to stay
within 1K for the whole setup.

I guess a DSLR is not necessary, point and shoot will do. But this
point-and-shoot should be capable of taking close up shots - say, to
focus at ~1-2 feet. Is there a P & S that can do macro shots and can
be remotely controlled through a PC and provide "live preview" through
a PC?


From: SMS on
runcyclexcski(a)yahoo.com wrote:
> I did some research based on what you said, and, indeed, I can not do
> it with an SLR, unless I am ready spend multiple $Ks. The Sigview is
> interesting, but that device is ~$500 by itself. I would like to stay
> within 1K for the whole setup.
>
> I guess a DSLR is not necessary, point and shoot will do. But this
> point-and-shoot should be capable of taking close up shots - say, to
> focus at ~1-2 feet. Is there a P & S that can do macro shots and can
> be remotely controlled through a PC and provide "live preview" through
> a PC?
>
>

1-2 feet is easy, it's below 4" or so where you have to be careful.

Most Canon P&S cameras have this capability. The G7 would be good, the
G6 would be better, if you can find one.

See "http://www.breezesys.com/PSRemote/features.htm#ps"