Dave scutt

I've collimated the laser, the circle on the primary lines up with the cap as from photo above but the laser seems to be out.

The star test I done the other night was perfect so should I adjust so the laser hits the circle or leave it alone .

I measured the spider vanes and they are all equal. 

What else could I adjust. 

Good choice, I was going to get one but they where out of stock .

As  @Laurieast said check to see if your focuser knob isn't glued on first.

Dave

1 hour ago, malgpz900 said:

Thanks, which on did you go for?

I think it's this one.

But I got it from the SGL classifieds for only £50

I've just upgraded mine, definitely recommend it.

I have an opticstar 127mm f9.5,  bresser remake. It's heavy but still easy to carry out .

There is CA but I use a Lumicon 2" Minus Violet filter which helps.

If using it for planetary and the moon I would recommend a skytee II mount very quick to set up and start observing. 

The view's are good but I haven't looked through any other refractor to see the difference. 

The moon picture was taken using my phone

54 minutes ago, TBRHussaR said:

Guys, I just tried to clean my mirror, but there is a “film “ of some kind that I can’t get off….any tips /advice?

Hi TBRHussaR.

Could you add a photo I'm sure someone would be able to help you.

Whan I done a star test and everything was concentric .

How much more improved would the view be if I adjusted the secondary mirror slightly 

19 hours ago, Laurieast said:

Is that image from the front end of the tube, and that's why we can see the diagonal adjustment screws?

Have a look here:

https://www.astro-baby.com/astrobaby/help/collimation-guide-newtonian-reflector/

 

 

I had to check what those 4 screw marks where .

It's the inside of the collimation cap. 

Maybe the Chinese rocket.

41 minutes ago, Spile said:

Your eyes are the best judge but based on your image the slight secondary tilt/rotation error is really not worth worrying about. More importantly I would confirm alignment of your primary with a cap. Aka https://astro.catshill.com/collimation-guide/

I done a star test last night and the rings were concentric. 

I got a laser collimator today to check it out but it's taken me nearly all day to collimate it.🤣

The photo was through a collinmation cap

4 hours ago, Spile said:

My interpretation of your image...

 

It looks just out , is it the secondary or primary 

First attempt at Jupiter. 

12"skywatcher dob. 

Es82  6.7mm.

Samsung a52 hand held at the ep.

Single shot no editing 

Nice postman just brought me this thanks to @jeffwjz .

No telescope just my phone samsung a52  iso3200  5secs hand held.

Just done a star test and the rings are concentric no more triangular shape.

I've never seen the stars so sharp , should have done this along time ago instead of putting it off ( being scared).

How do you get the blue, green and red circles overlaying 

30 minutes ago, JeremyS said:

But you’d have to wear a yellow shirt while observing 😊

And a cycling helmet 

My flocking material was due to arrive today from flo.

Waiting in anticipation I disassembled the dob. And cleaned the inside. 

Not long after, the postman arrived with the flocking material. 

After watching a quick video on YouTube  I decided to cut the meter long material in half to make it more manageable. .

After the flocking was done I used masking tape to get rid of any loose debris and excess fluff. 

Now it was time to reassemble the dob, starting with a new duel speed focuser. 

The primary mirror wasn't that dirty but the clips had been done up tight giving me pinched optics. 

I cleaned the mirror while it was out using the finger method and a drop of washing up liquid. Nice clean mirror. I used a piece of card under the clips so there not tight anymore.

Everything back together now, seems like a new dob. I also cleaned the bearings on the lazy susan and regreased them and it swings so smooth. 

Only thing left is to collimate which I've never done before,  im using a cap and a Cheshire. 

Will do a star test next time there out.

Dave.

Mirror back in and just had my first go at collinmation what do you think is it ok,  waiting for my laser to arrive so done with cap and Cheshire 

Yes it rotates now

Does it matter if the screws on the clips are not tight otherwise I cannot slide a piece of card in between the clip and the mirror. 

5 minutes ago, neil phillips said:

If you cant finger rotate in its cell, something is holding or sticking. Sticking is not so bad.

holding is worse.  Is the mirrors height against the 3 top clips adjustable ?

What about how its held side ways. Is that adjustable ?

 

Just taken off clips , mirror has just been washed and drying before I put the clips back on will let you know how it goes

On 21/07/2022 at 12:37, neil phillips said:

Yep thats pinched. And will likely destroy fine planetary detail. Sort that out and your lunar rills will be hairline. The mirror should be able to rotate in its cell. and when you move the cell around you should feel a very small clunk. as the mirror moves to a new position. Not moving in its cell by rotating. And no small clunk. is too tight. 

The mirror doesn't rotate and the clips look like they have been done up tight 

Nice postman just brought me some flocking material thanks to flo and their fast delivery. 

Now the fun begins