Image of the day

Captured by
RICHARD COFER

VdB 141 Ghost Nebula

My Account

New to Astromart?

Register an account...

Need Help?

Posts Made By: Larry Stange

December 28, 2002 05:44 AM Forum: CCD Imaging and Processing/Solar System

Cheap home-made Electronic Focuser....

Posted By Larry Stange

Brief article of retrofitting a cheap RA drive(with picture) has just been posted in "Astrophotography" under a title of "Dead Horse Resusitation". -LarryS

December 28, 2002 08:00 AM Forum: Film Astrophotography - Imaging and Processing

Taking the Hartmann Mask another step forward?.

Posted By Larry Stange

Having been introduced to the concept of the Hartmann mask by Paul Hyndman earlier...I would like to take it forward another step, and am currently searching for the materials to verify an unconventional approach to critical focus.

I that if two identicle polarized pieces of glass were put over the two holes of a Hartmann mask where one hole is polarized vertically, and the other hole is polarized horizontally...the center image should be blacked out leaving only the two outside images(1 vert. & 1 horiz.), approaching each other in the center as focus is adjusted gradually. When critical focus is achieved...ALL LIGHT SHOULD BE CANCELLED OUT with the horizontal & vertical polarized images superimposed.
---Any professional thinking on this would be appreciated. -LarryS.

December 28, 2002 09:22 AM Forum: Off Topic Discussions

A devils advocate to Black Holes.

Posted By Larry Stange

Having only scanned a laymans overview for about 30 minutes the other night on Black Holes...I came away with serious doubts about the concepts of black holes.

1. Black "holes" would have to be spheres, holes invites an incorrect mental imaging.

2. The Hawking x-ray/cosmic ray generation of some black holes would not necessarily be due to separation of particle pairs at the black *hole* gravitational horizon...but could be due to matter approaching the horizon with a corresponding collapse of the electron sub shells. (e.g., L-shell electons compressed to the K-shell with the resulting "Quantum energy difference released as soft to hard x-rays.). This occurs when matter goes from a higher state to a lower state. Of course this compressed "collapse" would occur on every subshell from the K-shell outward, generating a wide band of electro-magnetic radiation.

3.Hawkings conjecture of what happens inside the horizon does not really help. But if we want to go there...I like the White hole worm concept better. It would seem just as reasonable to think condensed matter would disappear traveling as a worm thru a White *hole* into another time, making another Universe. Going still farther out....It could help explain all the old popular Transcendental stuff like time regression under hypnosis and parapsychology. After all there is no physics definition for the structure of thought *waves* which COULD survive Black *hole* gravitational compression & destruction. :-) -LarryS.

Incidently...wonder if Laser light follows the inverse square law being collimated?.....probably, just further.

January 2, 2003 06:46 AM Forum: Off Topic Discussions

Late answer to John Meiners re: Light &...

Posted By Larry Stange

Been mess'n with webcam. On the simultaneous transmissions of hundreds/thousands of cell phones....imagine a single freguency being transmitted. The freq. is continuous but it is pulses, for example like digital logic(binary)code. These code pulses are in continual small groups. I will try and use the keyboard here for a overly simple example showing groups first. The little dots are MY spacing only signifying an unending stream of data. The "groups" are letters.
...[ A ]...[ B ]...[ C ]...[ D ]...[etc]...
Now within these groups like A, B, etc. Is many more pulses.
The phone company breaks up a conversation from #1 caller into pulses for transmittal. They can take ONE single pulse from Caller #1 put it into group A and take ONE single pulse from Caller #2 & put it in group A AFTER #1's pulse. They can do this for many callers. When Group A is filled they can start putting in the first pulses of other callers into group B and so on. This happens extremely fast!. When original caller #1 adds another sound by talking, that pulse gets put in the next available group, and so on with all callers. The phone companies electronics keeps track of which pulses went where from the different callers speech. Their equipment (the phone receivers & transmitters) are kept in step by special pulses so that the individual pulses come out the way the went in and are re-assembled back again into speech for each listener on the phone. This is a terrible example I know. But what I am trying to say is that many, many people can talk on the same frequency so-to-speak at the same time because speech is broken up into little bits and kept track of by electronics. Same as fibre optic communication cables, transoceanic phone cables under the sea, and satellites too. Digitizing like this is going on in your CCD. Don't try to listen to it. :-) My apologies to the electronics persons here who like accuracy. This is only a ROUGH example. The speed of the digitized transmisson is so fast your entire voice frequency can be taken apart, transmitted, and reassembled before you can finish the ending sound of any word. It operates nearly instantaneously
a laser can be aimed at your window and the sound of voices in your house can be decoded into speech by the minute vibration of the glass effecting the reflected laser light back to a surveilance vehicle or tracking station. -LarryS

January 6, 2003 05:51 AM Forum: Film Astrophotography - Imaging and Processing

Lunar landing photographs anyone?.

Posted By Larry Stange

Did any amateur/professional astronomer photograph any part of the lunar landing or the flight to the moon with earth based telescopic equipment?.

January 6, 2003 05:03 PM Forum: CCD Imaging and Processing/Solar System

Info needed on Connectix color/color2 webcam

Posted By Larry Stange

Have identified a webcam as an early Connectix Color or Color2 camera. Does anyone have the software for this parallel port webcam or the SPECIFICATIONS of it?. I have thoroughly searched countless websites looking for both. Thanks.

January 9, 2003 03:18 AM Forum: CCD Imaging and Processing/Solar System

K3CCDTOOLS doesn't recoqnize my Philips 675K

Posted By Larry Stange

Anyone been able to control the 675K with K3ccdtools?. It doesn't seem to support the 675K. It will however, recoqnize the avi files wherever I put the capture. I had hoped to use K3ccd to view the live image before capture and to control the number of images without using software for the Philips.

January 11, 2003 05:35 AM Forum: CCD Imaging and Processing/Solar System

Connectix color quickcam specifications?.

Posted By Larry Stange

Initial imaging with this webcam looks very promising particularly in true color besides very good definition.

Anyone know where a schematic or block diagram for that camera is on line?.

Also needed, any comparative specifications on this Texas made CCD and a PCVC675-680?. 250mv/lux on the color quickcam does not relate to <1 lux without more info. Tnx.

Last question- How do you join QCUIAG without getting tons of e-mail?....there are two places to click on selections.

January 12, 2003 07:42 PM Forum: CCD Imaging and Processing/Solar System

wanted-info on an epoxy for heat exchange.

Posted By Larry Stange

Need the name/type of a good epoxy that can absorb/transfer heat readily and is an excellent dialectric(non-conductive).

This is an attempt to bond a CCD substrate to ground plane traces and/or heat-absorbing metal nearby on a Philips 675K circuit card.

January 14, 2003 07:56 AM Forum: Film Astrophotography - Imaging and Processing

CCD fan WARNING et.al.,

Posted By Larry Stange

In the process of designing my 675K CCD housing I decided to test two 12V. ball bearing fans of the type used in computers.

A Socket 7 type, (more blades & air flow) for the larger processors had a distinct STRONG vibration under 100 hertz.

A Socket 3 type, (less blades & lower air flow) had a significantly reduced vibration but still strong enough to be easily felt by hand.

These vibrations of low frequency could easily degrade image quality if transmitted into the focus tube and telescope.

It might be wise to check image quality with fan on and off to see if the fan is causing reduced definition and contrast.

Of further note....most of the heat in the Philips Vesta PCVC675K is coming from the large processors on the piggy back assy board, NOT the CCD. This was a 1 hr. test with moderate illumination & heat sinking the CCD to the metal case via a cut-off metal mount which was a part of the original LED/Microphone/Lens front piece. The case was left open to isolate source of the heat. The heat sinking of the CCD did NOT increase case temperature in its vacinity.

I am a beginner, so these are for what it is worth. -LarryS