Diffraction Spikes

Hi Abdul, 

I think you can spread the cables from the camera and they will produce the spikes on the images. 

D

So spread the cables to the sides and maybe tape them as well?

It needs to be a cross pattern, just like the spider of a Newton. Tbh, why didn‘t you buy a newton XD?

Two pieces of string pulled tight with tape (on the sides) at right angles across the aperture will do it.

John

Yeah, it might be a bit more complicated with RASA but if you just cross the strings over the back of the camera (crossing at the middle), it should work just fine.  The strings just need to be pulled so that they are straight.  Unfortunately I don't have a photo and I'm not in a place where I can make a drawing.   It's so easy that you can just try it to see how it works...and if you don't like it, just pull the strings off!

John

You can also just buy a diffraction spike generator for Photoshop 

Hi John. I have the Rasa where the camera goes at the front,so how does this work? Have you got any picture for me to see?

Are you using a dew shield? 
If not, use it and put the strings that John mentioned on top of it and you are done!
Ciao.
Lorenzo

Yes I do use an aluminium dew shield

A Fishing line (nylon cord) would give stronger result, as it refracts light going through it, which creates much stronger effect that diffraction itself. It's pretty much similar to flat spider vanes of the Newtonian, where majority of light in the spikes comes from reflection off vanes surface, not from diffraction itself.

Real Diffracton Spikes for 0,04$ - Nebula Photos

CS
Danny

Danny:

Yes I do use an aluminium dew shield

A Fishing line (nylon cord) would give stronger result, as it refracts light going through it, which creates much stronger effect that diffraction itself. It's pretty much similar to flat spider vanes of the Newtonian, where majority of light in the spikes comes from reflection off vanes surface, not from diffraction itself.

Real Diffracton Spikes for 0,04$ - Nebula Photos

CS
Danny

*** Okay I will try this,thanks***

Abdul,

I also prefer the look of diffraction spikes on my RASA-11 images, so added vanes to an aluminum dew shield and routed the data and power cables along these. I use a flat ribbon data cable that has a thickness about matching the diameter of the power cable on the other vane, so the orthogonal spikes are luminance balanced to one another visually. These cables are held in place with clips and black theatrical (aka "gaffer's") tape.

Take care that any odd angles in flexing these cables take place within the light path that the camera with block from contributing odd flares into the image.

The usual thing of routing the cables in a semi-circular bend through the optical path broadened all the stars with circular haloes, as that diffraction effect spreads the light at all angles. The RASA's images are noticeably sharper since making this change.

CS

Jim

This looks really good. Might try it myself 

Hey Abdul,

I think this will do the trick, it’s a 3d printed model of a spikes mask/cable management for the rasa 8. It will help you keep your cables properly aligned and generate uniform spikes.

https://thangs.com/designer/michael.hamende/3d-model/RASA%208%20and%20C8%20Hyperstar%20cable%20router%20and%20aperture%20mask-344561

cs

*** So how do I purchase it?***

Okay thank you

This looks really good. Might try it myself 

Hey Abdul,

I think this will do the trick, it’s a 3d printed model of a spikes mask/cable management for the rasa 8. It will help you keep your cables properly aligned and generate uniform spikes.

https://thangs.com/designer/michael.hamende/3d-model/RASA%208%20and%20C8%20Hyperstar%20cable%20router%20and%20aperture%20mask-344561

cs

*** So how do I purchase it?***

You will need to download the model, and take it to any local 3d printing service in your area. I did a quick search, for UK, and this poppedup, but im sure youll do a better job finding one, cause im not in UK.

When you download the model there are 3 models, you will need to download the Rasa 3mm or 6mm (that's the size of the cable tray). 

You should also provide the link to the 3d service so they know what exactly they are printing if they need to check any info.


CS

*** Another thing how does it fit on the Rasa?***

It should fit, where the cover goes, I don't have a rasa, but i printed something similar for my C6. If you look at the bottom right of the link you will find a picture someone who's already printed this and used it, posted.