2 replies to this topic

[bill10385]

Nikon d7500

ISO 100

200mm

f/22

8 seconds

Nikor 70-200mm

Firecrest 77mm Eclipse Filter, ND5.4, 18 Stop

 

This image was taken about 2 pm on Sat 8/19 as part of a series of images to establish exposure parameters for the eclipse.  I was using a stable tripod with auto exposure and bracketing, so I was not touching the camera.

 

 

This is one of the few images where my histogram shows something other than the extreme left side.  Even this is still primarily in the black on the histogram.  I am finally starting to get some yellow in the sun rather than blown out white.  Tomorrow I will take more shots with exposure times up to 30 seconds (which sounds completely crazy to me).

 

 

Is the bluish shadow to the left of the sun an artifact?  is the round object to the left and below the sun a planet?  the moon?  or is this an artifact?

 

Would appreciate thoughts and inputs on this as I am not comfortable with my progress on this. 

Image....

Attached Thumbnails

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[Merco_61]

Why f/22? When you stop down past f/16 or so, diffraction sets in, the high-density DX sensors tend to exaggerate this. It is best to keep the aperture wider than f/11.

 

The light in all channels are near fully outside the histogram already, so why would you want to increase exposure?

The little toe that disappears on the right is the sun exposure.

 

With a lower exposure, the coma aberration will be less as well.

[bill10385]

Peter:

 

Many thanks for your input.  

 

I started with f8 and did a full series of exposures from 1/6400 to 1 second, and then did the same will f/11 and f/16 and then f/22. With some of the early attempts I tried using autofocus and realized that wasn't working.

 

Still, I haven't gotten a single image where the histogram shows exposure blown out on the light side of the histogram.   Hence my comment, "which sounds completely crazy to me."  It defies my logic but as I used the smaller aperture and longer exposure the histogram seemed (at least to me) to be moving towards the lighter side (again, this defies logic) so that is why I reached out for a sanity check.    

 

I will go back through my images at wider aperture and shorter shutter time and if I get a chance take more images.  We are in total cloud cover today , hopefully I will have a break in the clouds this afternoon to try again.