Barlow lens for camera

[recceranger]

Hi folks,

I recently got hold of the new ZWO ASI 462MC Colour Imaging Camera and was testing it on Mars with my RC8 a few nights back. The RC8 focal length is 1600mm and I wanted to add my Baader 2.25x Barlow (for Zoom Hyperion) to the camera but when I did it was a complete image blackout!. To ensure the image didn't simply shift out of FoV at increased mag, I zeroed in on the centre of the moon but still a blackout. I'm all ready using all of the supplied iOptron RC8 extension tubes to achieve the required back focus. Any advice is greatly appreciated.

 

 

Edited October 7, 2020 by recceranger

[michael8554]

As you know a Barlow will extend the focal point further, so is often used to get focus with a camera on a Newtonian.

So you're going to need more spacers.

But even so the moon should have overexposed your camera, so something else wrong perhaps ?

Michael

[900SL]

Bit late but you shouldn't use the adapter 'A', you should have a T2 adapter 'B' for a camera connection

Additionally the zoom depends on the backfocus, at 55mm backspacing it is around 2.7x see more here

https://www.baader-planetarium.com/en/blog/barlow-lenses-their-magnification-factors-and-working-distances/

I've just ordered one from FLO for use with an ASI 178mm, I'll be trying to get around 2.25x mag so I'll need a M42 spacer to get 25mm backfocus

 

 

 

 

Edited January 10, 2023 by 900SL

[recceranger]

23 hours ago, 900SL said:

Bit late but you shouldn't use the adapter 'A', you should have a T2 adapter 'B' for a camera connection

Additionally the zoom depends on the backfocus, at 55mm backspacing it is around 2.7x see more here

https://www.baader-planetarium.com/en/blog/barlow-lenses-their-magnification-factors-and-working-distances/

I've just ordered one from FLO for use with an ASI 178mm, I'll be trying to get around 2.25x mag so I'll need a M42 spacer to get 25mm backfocus

 

 

 

 

Never too late friend and thank you. This is very useful. I did manage to rectify the problem through trial and error, but I think a bit of knowledge goes a long way.