Jump to content


Photo

meade color usb pc camera


  • Please log in to reply
7 replies to this topic

#1 new07

new07

    Newbie

  • Members
  • Pip
  • 4 posts

Posted 10 August 2009 - 03:50 PM

Hello..

I have bought a color usb pc camera (meade) and it seems to be working just fine..but the thing is that i keep seeing a black dot on the left side of viewing screen..

I am not sure if it is due to dirt on secondary mirror or primary mirror of my reflector telescope?? Maybe it could be something else and I don't have any other suggestions..

so did anybody else has this kind of problem before??

any comment or suggestion would be really appreaciated

Thank you..

#2 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 10 August 2009 - 07:00 PM

If you can post a pic it would help.
It could be either of them or dust or dirt on the CCD chip.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#3 new07

new07

    Newbie

  • Members
  • Pip
  • 4 posts

Posted 10 August 2009 - 08:48 PM

thanks for responding Mark..

it seems i have another issue at hand than this black dot I am talking about..

Tonight from 10 pm to 12 am ..I've tried to see jupiter with this camera and didn't have much success in seeing a part or the whole picture..I mean preview on the screen

I am not sure what I am doing wrong ..if the brightness is too low or exposure is not set right or maybe something else..or maybe my 80 mm reflector doesn't have that much light gathering power compare to big ones..

if you know something about this or someone else does..I'd really appreciate any help...

thank you very much...

#4 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 10 August 2009 - 09:02 PM

The 80 mm scope should give you a decent view.
What problems did you have?
Things to be sure of is make sure you have a good focus.
Also check your exposure times as Jupiter is bright it will only need very shout exposures of well less than a second.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#5 new07

new07

    Newbie

  • Members
  • Pip
  • 4 posts

Posted 10 August 2009 - 09:28 PM

Hello again..

Even though you say i should have good focus but wouldn't it matter much since I would focus it again once I get a blurry, indecent picture  in my view..or does it have to be focused from the beginning ....

plus i didn't know that the exposure should be less than a second..i had it on 73 which was set as default...do you think that might the reason i didn't get picture...

#6 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 11 August 2009 - 06:47 AM

Focus is critical for any imaging.
If you are out of focus the result is a blurry image with no details.
Also if your exposure is to long you will get a bright washed out dot with no details at all.
You have to expierment on each scope to get the right exposure time.
The Last time I shot Jupiter I thionk the exposure time was like .22 to .26 seconds.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#7 new07

new07

    Newbie

  • Members
  • Pip
  • 4 posts

Posted 11 August 2009 - 07:14 AM

Thanks for your suggestions Mark..

I think I've got to do some trial and error kind of procedures with this camera until I get some results...
I wish I could do it again but weather here is getting cloudier..not sure when I'll get a second chance..but thanks a lot for your suggestions...

#8 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 11 August 2009 - 08:30 AM

A good place to practice things will be pick a far away small terrestial target and practice on framing on it as well as exposure times.
Increase and decrease exposure times to see the effects and practice focus.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users