My Telescope

[JayA]

I have been building a Newtonian reflector but, I cannot get a sharp image. The reflecting mirror is at fault, I guess. The image is too blurry to understand anything. Your help will be surely appreciated.

[Peter Drew]

Hello JayA.   Welcome to SGL.    A little more information about your telescope please.  Aperture, focal length, commercial or home made optics?     🙂

[andrew s]

Photograph would help.

Regards Andrew 

[JayA]

The focal length is 48 cm, aperture is 15 cm. It is a parabolic mirror.

Sorry, its my mistake it's focal length in 38 cm

 

Edited April 17, 2020 by JayA

[Peter Drew]

A 6" F8 parabolic mirror would have to be very bad to give a blurry image.  My bet is that something to do with the construction is spoiling it at the moment.  This should be possible to improve.  A photo or more construction details will help us help you.   🙂 

[miguel87]

That's not F8, works out as F3.2, I know very little about telescopes but that is very fast. Others will be able to tell you if this is causing problems.

What are you viewing that is showing you a blurred image?

Where did you the get the mirror?

Mike

Edited April 16, 2020 by miguel87

[Kev M]

Are you sure it not 48 inch focal length f8, this would be quite common for a 6 inch mirror

 

[Cornelius Varley]

16 hours ago, JayA said:

The focal length is 48 cm, aperture is 15 cm. It is a parabolic mirror.

Sorry, its my mistake it's focal length in 38 cm

Where did you obtain the mirror or did you make it yourself ?  With a focal length of 380mm and a diameter of 150mm the fr is 2.533 which is incredibly fast.