Image Scale.

[mike3parareg]

Good evening.

I have been into this hobby now for a couple of months and I feel as though I could really get into it.  I know it will be a steep learning curve that will take years to get the basics of but I will get there.  With help from this forum and other online sources, books and trial and error the results should come in.

The problem I am having is the planet image I process (Jupiter, Mars) is really small when finished.  I have read the post that GUS posted on july 6 2017, and that is the problem I am having.  I read all the replies which I found to be in depth but I thought never really answered the question.  I also read what Luna-tic posted on November 7 2017 which confused me even more.  So, Do I need a eye piece projection Adapter?  I have tried increasing the drizzle in Autostackert3 to 1.5x and 3.0x.  That works but as you can guess the image is blurry.

The equipment I am using is a Celestron Advanved VX8.  A Cannon 700D.  A 2x and a 3x Barlow.

 

Many thanks for your time.

 

Michael.

[happy-kat]

 

Hi

Funnily I've just been reading up on this.

Have you used the imaging resource FOV calculator to check the effect of your gear on Jupiter. Can you make use of a video 1:1 crop mode when recording video of Jupiter that might help. The pixels in planetary cameras are small the pixel size in your camera is larger at 4.3um.

Edited November 14, 2020 by happy-kat

[happy-kat]

I think this is you telescope and camera, the centre frame of an example.

I don't know anything about eyepiece projection, hopefully someone else will reply.

[jambouk]

Even with a 3x Barlow, Jupiter for example, is only going to cover about 100 pixels on the sensor of the camera, by 100 pixels. A very small area of the sensor. The resultant image will be of similar dimensions, which is pretty small. If you try and enlarge that image it will become blocky and look awful. One image below shows how Jupiter is framed in your scope with a 3x Barlow and your camera.

if you want Jupiter to be much bigger, you need a longer focal length telescope and a camera with smaller pixels. The second example below shows how Jupiter is framed in a C14 with your camera and a 3x Barlow (not necessarily recommended) and the planet occupies probably 500x500 pixels.

 

 

[mike3parareg]

Thanks to happy-kat and Red Dwarf for your quick reply.  I get it now and the information you gave does help.  I think this may involve raiding the Piggy Bank again but not just yet.  I read on here that people have a telescope and kit for observing and a different telescope and kit for astro p.  Get the overtime in and keep the missus sweet.  Thanks again and stay safe.

[happy-kat]

I think the piggy bank is safe, could just look more into video crop mode I mentioned with the camera you already have. Here's one such search.

https://www.astropix.com/html/i_astrop/eq_tests/canon_one_to_one_pixel_resolution.html

[mike3parareg]

Thanks happy-cat.  

                                      Funnily enough I did see that post and it kinda put me off because that means more clutter to have around.  Having the laptop attached to the camera whilst outside is just one more thing to carry, connect and have sat on top of the table on the decking along with all the other stuff.  I have purchased a eye piece projection adapter for 12 quid and see how it goes.  I will post the images I get and tell you my opinion.  I have already fell into the rabbit hole and don't really want to go any further down.  However, we will see.  Thanks again for your time.