moon

This picture is taken with stacked extenders.

 

The configuration of the camera and lens is as follows:

EF70-200mm f/2.8L IS II USM @ 200mm

Canon Extender EF 2x III

Kenko Teleplus HD 2x DGX

Kenko 20mm extension tube

Canon Extender EF 1.4x III

60D

 

The 20mm extension tube is added so that I can mount the Canon 1.4x extender. Although adding extension tubes should lose the ability to focus at infinity, it would seem that I am still able to focus on the moon.

 

What is the focal length for this photo?

It would seem that the focal length recorded by the EXIF accounts for the two 2x extenders (200mm x2 x2), but not the 1.4x extender. Similar case for the aperture. I also do not know what is the effect of extension tube on focal length.

Given that this photo is uncropped, is it possible to determine the focal length of the setup based on this photo?

 

Focusing difficulties

Viewfinder AF does not work. Live View AF sometimes work. Manual focus is difficult because a slight touch on the camera or lens will cause a lot of shake, especially with 10x magnification Live View, making it difficult to judge focus.

Not to mention that the moon will move across the frame in around 30s, so that I have to re-frame again.

Also, Live View will auto switch off, if I don't keep my finger on the shutter button, half pressed.

 

Processed in Canon Digital Photo Professional 4

Done