Widefield Foreground Question

[LenGazer]

When taking wide field photographs with objects in the foreground.. I Stack using deep sky stacker... The foreground objects will blur,  How do you take photographs of the Stars and a foreground object without the stars streaking, or foreground blurring?

The above image I took a week or so back..
 

This type of photo is what I'm trying to achieve

 

[Psychobilly]

Photoshoptrickery take a single exposure for the foreground and combine then in ps...?

[ollypenrice]

You can only stop the stars trailing if you track with an equatorial mount, though by taking short exposures you can reduce the problem.

As Peter says, you then use Ps to put a single exposure skyline over the blurred one. Use layers and the magnetic lasso tool to crop out and apply what you don't want (ie the blurred skyline.)

Olly

[Alien 13]

As stated in the previous posts a bit of PS layres with two images will do the trick however if you have a fast wide angle lens you can probably push exposures on a non tracking mount to 20 seconds which can give good results.

Some portable EQ mounts have an option for half speed tracking that allows slightly longer exposures without noticible movement of the sky or forground.

Alan

[Psychobilly]

As stated in the previous posts a bit of PS layres with two images will do the trick however if you have a fast wide angle lens you can probably push exposures on a non tracking mount to 20 seconds which can give good results.

Some portable EQ mounts have an option for half speed tracking that allows slightly longer exposures without noticible movement of the sky or forground.

Alan

I made a  "guide port" test box that had switches for RA an DEC and you could  use it to slow down the RA axis... by  enabling RA-  and then adjusting the autoguide rate you could vary the relative trailing in either the stars or foreground objects...

Peter...

[Mr TamiyaCowboy]

full frame camera has no crop, so a 10mm fish eye lens is 10mm and the full viewing angle.

on our APS-C cameras a 10mm lens is still 10mm but our field of view is cut back alot. 

image above looks to be taken with a full frame capture.

you first focus for the foreground, bash a shot off.

you focus for the middle ground, bash an image off.

you focus for infinity and bash a image off.

you now take a final image exposing for the stars, 

take all images into software layer and mask up,

adjust contrasts, levels, saturation, hues. bump up gamma

lower lumination. 

using back or white brush you then paint in the starscape.

save image and your done.

the method above is called focus stacking, we use this taking panoramas

where you want the fore/mid/rear all focused sharp so we focus for certain points in the image

to get what we need with software help.

for your image : 

heres how to cheat a little. wait till dark, set camera up, grab a couple torches

and take a long exposure , as the camera takes picture you now use the torch

to highlight the tree, not to much and be careful. 

now review image back, does the tree look nice and has some light casting to it?

if so, now expose again and again and again for your star trails.

on the computer stack ALL your star trails, and merge down the layers.

now open your light painted tree image and add this to your star trail image as a layer mask

now using brush ( white adds, black removes ) you paint in your nice tree.

save and then admire your handy work.