It's more than apparent—judging by sceptimatic's confused attempts at debunking the NASA photographic images, that he has very little understanding of the technicalities of digital photography (or in some cases film photography). He also fails to comprehend the ongoing issues caused by lens flare, ghosting, and aberration.
As an example, when a lens is directed at a strong light source, a whitish flare is produced. When non-incident light reflects off the lens surfaces (especially internal elements) and the mirror frame, ghosting often occurs. Additionally, the lens' spherical front surface causes some degree of image distortion and contains irregularities that cause problems such as chromatic aberration, or color bleeding.
Also, when a lens is directed at a strong source point of light (like the sun in space), unneeded rays of light reflected from the lens surface, the aperture blades, or the camera mirror's frame can have a "blanketing" effect on the lens, and which causes all or part of the image to turn whitish, and sharpness is lost. This is exactly what's happening with the apparent white haze appearing to spill over the opposite side of the shuttle's tail.
Another effect is known as coma, which is a refractive problem that occurs in off-axis point light sources causing image aberrations. Due to the difference in refraction near the edges of a spherical lens element, or at the edge of the aperture blades, off-axis point sources of light may appear stretched and "haloed" at the focal plane. This results in improper convergence of light rather than convergence into a single focal point. Coma is generally a combination of both spherical aberration of a point light source and chromatic aberration to produce an effect that looks like a comet. It's also a problem that largely affects astrophotography, as isolated point light sources are most common in those scenarios.
Modern high-end technical lenses usually include an aspherical lens element which cause less refraction at the edges and more in the centre, resulting in proper convergence over a given focal length.
Possibly the most commonly caused aberration is lens flare, which is severe in the posted image of the sun. Flare occurs when non-incident light enters the lens and reflects off of the various internal lens elements or diaphragm. The effect, when strong enough, can create bright spots and streaks, and may also have a detrimental effect on contrast where it occurs. Flare is can also be caused by a very bright near off-scene light source, such as the sun, or a bright rearwards light illuminating the overall scene.
Without understanding the complexities of all these shortcomings in photography, it's very difficult to simply dismiss NASA images posted here as bogus or Photoshopped. It would also seem logical that if NASA were manipulating their images, they'd be taking a lot more care to delete any all-too-obvious giveaways.
And the flat earthers still haven't posted any of their images for the round earthers to examine. Again, why is this? Why are they so coy about showing us even just a couple of images? Shouldn't be all that difficult if—according to them—the earth is truly flat.
C'mon flat earthers. Put your money (or your images) where your mouths are!