For an equivalent focal length around 1,300mm the stars Zeta to Delta Orionis at 2.736 degrees separation are probably too far apart
Zeta to Epsilon Orionis are 1.356 degrees apart.
Epsilon to Delta Orionis are 1.386 degrees apart.
Orion is visible in the evening.
One should photograph them at a reasonable elevation above the horizon to stop atmospheric refraction slightly changing the separation.
The exposures should not be long. Sufficient to give good but small star images, not bloated star images.
If the 80mm scope plus converter and the Superzoom camera are used then comparisons at infinity can be made.
The Moon is another possibility but the apparent angular diameter is I think given for mid Earth. Diffferent parts of the Earth's surface could cause up to 1.5% error.
It may be some programmes correct for this.
The1.4x converter may have an attempted magnification of 1.414x rather than 1.4x but is likely 1.43x or similar.
I think this is the main sorce of error.
The size of the sensor I think has to be taken from the manufacturers specs. Both DSLR and Superzooom bridge camera.
Zoom lenses have complex focal length changes as do some odd modern fixed lenses such as one of Sony's fixed focus wide angles that actually behaves like a zoom.
Zeta to Epsilon Orionis are 1.356 degrees apart.
Epsilon to Delta Orionis are 1.386 degrees apart.
Orion is visible in the evening.
One should photograph them at a reasonable elevation above the horizon to stop atmospheric refraction slightly changing the separation.
The exposures should not be long. Sufficient to give good but small star images, not bloated star images.
If the 80mm scope plus converter and the Superzoom camera are used then comparisons at infinity can be made.
The Moon is another possibility but the apparent angular diameter is I think given for mid Earth. Diffferent parts of the Earth's surface could cause up to 1.5% error.
It may be some programmes correct for this.
The1.4x converter may have an attempted magnification of 1.414x rather than 1.4x but is likely 1.43x or similar.
I think this is the main sorce of error.
The size of the sensor I think has to be taken from the manufacturers specs. Both DSLR and Superzooom bridge camera.
Zoom lenses have complex focal length changes as do some odd modern fixed lenses such as one of Sony's fixed focus wide angles that actually behaves like a zoom.
