Day 10 Moon on 07 Nov 2008

Post by **weixing** » Thu Nov 13, 2008 12:33 am

Hi,
Took this day 10 Moon on 07 Nov 2008 to estimate my setup focal length.

Below are the shooting info:
Canon 450D on Vixen R200SS with 2x barlow (Effective Focal Length: ~2180mm @ F10.9)
Composite of 11 x 1/100s @ ISO 200

Reprocess version:

Below are the shooting info:
Canon 450D on Vixen R200SS with 2x barlow (Effective Focal Length: ~2180mm @ F10.9)
Composite of 5 x 1/100s @ ISO 200

Have a nice day.

Zephyrus · Post by **Zephyrus** » Thu Nov 13, 2008 2:30 am

Wow, it looks really sharp, as if I'm looking at it from a window on a spaceship. Great work, I really enjoy looking at moon photos even thought I don't really like to observe the moon that much.

Clifford60 · Post by **Clifford60** » Thu Nov 13, 2008 8:39 am

We get another great moon man.

universe24 · Post by **universe24** » Fri Nov 14, 2008 2:44 pm

Sharp! I feel there is stacking effect....??? My eye problem...???

Post by **Airconvent** » Fri Nov 14, 2008 5:53 pm

weixing cheated. this was taken from his camera installed onboard the India's Chandrayaan-1 lunar orbiter. [smilie=crying2.gif]

Just kidding! Good image WX!

zackae · Post by **zackae** » Fri Nov 14, 2008 7:12 pm

Universe I think why you feel that there is a stacking effect is because the image couldn't be THAT good right??

Dragon Man · Post by **Dragon Man** » Fri Nov 14, 2008 8:13 pm

Nice work, Weixing

Excellent focus and nice detail [smilie=good-job.gif]

Post by **weixing** » Fri Nov 14, 2008 9:04 pm

Hi,

I feel there is stacking effect....???

Err... this image was the result of stacking 11 images (I thought I indicate it in my first post) and the stacking effect is there especially at the right side of the image. This "stacking" effect should be due to the atmospheric turbulence... the turbulence cause some part of the Moon to "shift" a bit in some of the images. As a result, some part of the Moon will not perfectly aligned even the rest of the Moon were aligned and cause the "stacking" effect when stacked.

Anyway, IMHO, it's basically impossible to get such a sharp single shot image at this long focal length at low altitude especially I'm using a large central obstruction Newtonian and the shutter speed I used (1/100s) was too slow to "freeze" the turbulence at this long focal length.

By the way, my main objective was not to image the Moon, but to use the Moon to estimate my scope effective focal length when using my 1.6x and 2x barlow. So I just took all the images I took using the 2x barlow (I shoot too many of them) without selection (too lazy

) and RegiStax do the rest... Hee hee

may be my only contribution after shooting the images was to crop the original image as RegiStax don't support resolution higher than 4096 pixels (height or width).

Thanks for all the comments.

Have a nice day.

universe24 · Post by **universe24** » Fri Nov 14, 2008 9:18 pm

Hi weixing, thanks for the explanation and I agree with that.
Anyway, I believe such sharp lunar image can be achieve. Depend on the telescope quality and performance.

Do you use multi-point alignment or just single point? Do you sharpen your image?

Thanks again.

Post by **weixing** » Fri Nov 14, 2008 10:27 pm

Hi,

Do you use multi-point alignment or just single point?

Multi-point... 2 point.

Do you sharpen your image?

I do auto-level and unsharp mask in Photoshop using radius of 0.5 pixel.

Anyway, may be I'll do a more accurate cropping and more alignment point to see whether does the image improved.

Have a nice day.