Another moon shot…

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David Berry

David Berry

🇦🇺 Australia 🦘
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Drifting through the sky…
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2023-08-06 07 — 7am (UTC +10)
~ 27ºS; 152ºE​
If you look up in the western morning sky today you should see the moon looking a lot like this. It'll be smaller (already 12 hours since photographing) and, if you are in the northern hemisphere, your moon will look like it has been rotated about a quarter-turn clockwise — that's because I'm Down Under and you're 'Up Over'. (The long, drab green leaves should immediately identify the tall tree as an Australian eucalypt.)

I was tidying up the garden when I heard the unmistakable 'whoosh' of a hot air balloon's burner. Straight overhead! As usual I had neglected to take a suitable BIF (get it?) kit with me, and so had to hobble rapidly indoors and grab a suitable zoom. The balloon was, by then, heading north-west in pursuit of our planet's constant companion.
Who needs a BIF lens that zooms down to 100mm? For once, I did, but I failed to notice that the unfamiliar f/4.5 aperture was too wide.

Why don't they make variable-aperture zooms with the larger aperture at the extreme end? Should be simple. :rolleyes:

!​

 
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David Berry said:
Who needs a BIF lens that zooms down to 100mm? For once, I did, but I failed to notice that the unfamiliar f/4.5 aperture was too wide.

Why don't they make variable-aperture zooms with the larger aperture at the extreme end? Should be simple. :rolleyes:
Click to expand...
Well likely because manufacturers don't really sell a BIF lens as much as a mid range zoom that could be used for portraits, landscape isolation shots, sports and many other things where f/4.5 or even wider apertures would be welcome.

It really wouldn't make any sense to build a variable aperture zoom with the widest aperture at the long end as you'd basically be throwing away potential light gathering and DoF control at the short focal length end.
 
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