From: runcyclexcski on
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).

From: Pete D on

<runcyclexcski(a)yahoo.com> wrote in message
news:1184816777.299478.28800(a)e9g2000prf.googlegroups.com...
>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).
>

What you want to do cannot be done unless you set up some sort of mechanical
device to do the zooming.

Why must it be a D-SLR?


From: John Bean on
On Wed, 18 Jul 2007 20:46:17 -0700, 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)?

Not in the way that you mean. There are cameras with "live
view" tilt/swivel LCDs that would let you do what you need
to do without a PC, and there's an add-on device called a
Zigview that will do the same for pretty much any SLR.

One version of the Zigview allows you to remove the screen
from the camera and use it as a "remote" monitor.


--
John Bean
From: Alan on
The new EOS 1d-mkIII has the capability to live view through the lens
via a cable to a computer but at $4500 US that is probably beyond your
needs. An angle finder might be more appropriate. I recently had an
occasion where I needed to shoot an object straight down from a heighth
of over 6 feet with a 1d-mkII on a tripod and my angle finder "c"
enabled me to do this fine.


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).
>
From: SMS 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)?
>
> 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). Good luck
finding one of these lenses, you'll have to go on eBay and buy an
EOS-700 which came with that lens (the lens wasn't sold separately).
This assumes that the lens will work and focus on a Canon EOS digital,
but I think it should work. You probably want to use a 5D or other
full-frame sensor Canon D-SLR to avoid the crop factor so you get a true
35mm. Not a great lens, but maybe good enough for what you want to do.

You could buy a board for the PC that would let you simulate the button
pressing remotely, i.e.
"http://www.ieci.com.au/products/Product_Page2.asp?Product_ID=431"

It all depends how much you have to spend, and how mechanically inclined
you are.

Of course with the proper non-SLR all this would be very easy.