Summer moon shot at 1714mm (effective)

[micloi]

Real size, just cropped, no enlargement.

Shot with a Canon 40D (on a tripod of course!) using:

1. Sigma 100-300mm f4 lens

2. Three teleconverters stacked:
a. Sigma 1.4x
b. Kenko 1.5x
c. Soligor 1.7x

300mm x 1.4 x 1.5 x 1.7 = 1071mm
1071 x 1.6 (Canon cropped sensor) gave me an effective 1714mm telescopic lens.

http://i387.photobucket.com/albums/oo311/micloi/9b430efd.jpg

[TheBigDog]

very nice detail, is the haze due to the weather or something else?

[Bernoulli]

First of all, this is a really nice shot. Yes a bit hazy, but good detail. The haze can mostly be removed in PP.

But let me open a can of worms about effective focal length. I don't think you get to count the 1.6X crop factor from using the APC sensor and here's why. The image size on your sensor is the same as if you had used a 1071 mm lens (which you did). Now, the image doesn't know where the edge of the sensor is because it didn't reach the edges - this isn't a full frame shot. You would have the same size of the moon projected on the sensor no matter how big or small the sensor is.

Any digital enlargement that you did in PP is the same principle as the digital enlargement you'd get if you took an image covering an APC size sensor and blew it up to the size of a 35 mm sized sensor.

So there's a focal length of the actual lens used and, beyond that, any enlargement due to smaller sensor size or cropping is the same thing - digital zoom. The 1.6X crop factor is just digital zoom and, since you performed digital zoom by cropping the image, it's hard to know how much extra magnification there is. But the original image was taken at 1071 mm.

Does this make any sense?

[micloi]

The haze was due to the weather. It is actually much less visible than with the naked eye!

Any tips on how to remove it (if al all possible)?

[Bernoulli]

The haze was due to the weather. It is actually much less visible than with the naked eye!

Any tips on how to remove it (if al all possible)?

If you'll give me permission to, I'll clean it up then tell you how. In this forum, we can't edit other folk's pictures without there permission (you can check a little box in your profiles to give everyone permission if you want). But a little PP will fix this right up.

[mlc]

This was clearly taken last night - here's my effort also from last night taken on 50D using Celestron Nexstar 8SE 2000mm telescope.

393074

[dmeiselman]

...1.6X crop factor from using the APC sensor and here's why. The image size on your sensor is the same as if you had used a 1071 mm lens (which you did). Now, the image doesn't know where the edge of the sensor is because it didn't reach the edges...

This is entirely accurate for a Full Frame sensor with the same pixel density of the 40D, which would result in a 25MP sensor. Not unreasonable, and you can certainly crop down from a 25MP, but I think the OP was noting that the angle of view is equivalent to that of a 1700mm lens.

[micloi]

This is the same image from my 1st post edited for me by someone else.

http://i28.tinypic.com/6e3tzb.jpg

[Celestron]

There is burnout on the second and third image posted with loss of detail . I've seen Ricks work and he can do that first moon image justice .

[micloi]

Whoever wants to work on the image here is a higher resolution copy:

http://farm3.static.flickr.com/2581/3909318250_15b475f318_o.jpg

[Adrena1in]

Wow, the quality is excellent, and it makes me wonder just how many TCs you could stack together and get away with it!?

[Bernoulli]

Here's my before and after. The easiest way to get those blacks to be really black is to go to the levels control (assuming Photoshop) and move the left-hand slider in towards the middle. That'll set the black point up higher.

The only other stuff I did was to enhance the constrast in the mid-tones (using curves) and a tiny bit of sharpening.

[micloi]

Good job, thanks :)

[Scoobs]

Really good to see a before and after. Just shows how good post processing can be.

[VIGER]

2. Three teleconverters stacked:
a. Sigma 1.4x
b. Kenko 1.5x
c. Soligor 1.7x

I am very impressed. Good work. Someting else to try.
Regards

Michel