Celestron Schmidt Camera
Posted 26 March 2013 - 11:48 AM
Now what can I do with it ?
Not sure yet if roll film holder is included.
Has anyone installed a CCD in place of the film holder?
Posted 26 March 2013 - 01:04 PM
Didn't these have some sort of provision to "bend" the film to match the curved field they produced? That would seem to be the downfall of sticking a CCD in there instead of film. Field curvature would do it in. A correcting lens could be employed, then you have a Hyperstar.
Posted 26 March 2013 - 01:57 PM
Posted 27 March 2013 - 11:06 AM
used lodestar ccd
Posted 27 March 2013 - 07:47 PM
i miss the old Tech Pan, TriX days when I built a Hypering chamber, We had a local welding company that one guy would
"hand mix" the gas for me, he did a darn good job..
He retired so did my Hyper Kit.. Still have my old Minoltas tho..
It would be cool if someone came out with a Loadable ccd to put in those old Cameras... I know I know it will never happen, or backs were made, but man I loved the feel of those mechanical cameras.. Still get them out timr ti time to actuate the shutters to keep them loose.. SRT102-202 were my favorite..
Posted 27 March 2013 - 08:53 PM
eh - NY suburb - 5.4 skies on good day
about 50 sec exposure single unstacked - super fast babies those sc's
Posted 30 March 2013 - 10:30 AM
Good condition,just a little dust on the bottle,errrr.....mirror.
Corrector plate described as dirty but doesn't look like a problem to me.
No film holder though.
Mounting foot on the mirror end and a kind of pin parallel to the tube midway on the bottom ,so some work and ingenuity needed to securely mount this.
I suppose piggyback mounting is usual so the observer and photographer can actually find and see the photo subject ?
Tagged "Arizona Western University" ;, no doubt sold as obsolete.
So now to figure a way to secure a CCD camaera or webcam ,or maybe a Newtonian diagonal on a stalk inserted where the film holder should go? And would I lose the superfast f1.65 by converting to Newtonian system?
Schmidt cameras are new to me .
But couldn't pass up this chance for fast optics.
Posted 30 March 2013 - 10:52 AM
Since there is no free lunch,what am I overlooking?
Posted 31 March 2013 - 04:57 AM
Fl won't make out door unless barlowd
Plu cone is wide
Do you have vane fins in tube?
Posted 31 March 2013 - 11:02 AM
I guess there is a camera there.What keeps it in place?
The vanes and machined cylindical piece are in place in mine ,just no actual film holder.No doubt the film holder(s) were in another box at the auction.
Posted 31 March 2013 - 11:22 AM
If you look behind cap
You can see body
Held by simple pressure
Rubber strip added to vanes
Thst is why I chose lodestar
Almost exact size
I got bw and color
Posted 31 March 2013 - 06:02 PM
he was grand master of sc camera
sc have internal reflection issues
this is normal but annoying
here is example
Posted 02 April 2013 - 08:56 PM
BigC I suggest you read
Adventures with mr schmidt telescopes
By David H Levy (star trails)
He explains agony and ecstasy of using
3 years to focus with film
Posted 05 April 2013 - 01:03 PM
If you get a spare film holder and IF (yes a big one) you adjust the focus successfully (a long and tedious process) then you will have outstanding results. Far better than with small CCDs like lodestar. Fuji acros doesn't need any hypering and with any film the short exposure times with superfast schmidts reciprocity failure is not much of an issue.
Posted 05 April 2013 - 05:21 PM
But the reality
I got pictures
I'm still waiting to see some film shots
From any one since 1990's
Posted 16 April 2013 - 12:10 AM
b/w films are still available, and still with good characteristics. Cost structure for film imaging with SC is superior in comparison to CCD. Not to mention that the film equipment is far more portable. Nevertheless CCD addition to SC is an interesting approach.
Posted 16 April 2013 - 02:52 PM
Of course their ccd are real large
Posted 16 April 2013 - 11:08 PM
Posted 17 April 2013 - 08:42 AM
I know that Robert Piekiel modified at least one 5.5 Celestron Schmidt and at least one 8 Celestron Schmidt to Newtonian configuration by:
1. Opening a 2 inch hole in camera's door
2. Adding a screw type focuser.
3. Adding a PVC pole with a elliptical type diagonal on the magnetic film holder of the camera.
As a result he could "see" the image few mm above the reflective diagonal surface.
I think that Robert is a member of Cloudynights community, so you can reach him for additional information. See a relevant picture below.
Of course the curved field remains. So, this would be a nice challenge for the dedicated amateur. To find a combination of a 50mm diameter relay lens that can send the converging rays out of the tube with field flattening properties. A dedicated SC field flattener should be typically a plano-convex with the convex side (facing the mirror) having a radius of curvature, R, given by:
R = F(n–1)/n
where F is the focal length of the Schmidt camera, and n is the refractive index of the glass used for the field-flattening lens.
This lens should placed as close as possible to the CCD face. For the SC users in the US with the skilled ATM community I thing that the article below is very useful:
Personally, I believe that SC are still alive and potent instruments.