F35 vs flies

[ThomasH]

In this video (and X post), there was some great data on the camera, lens, time and other details:

Source: https://youtu.be/VH4wrZnp9Pk?si=fDAKKkqx07u6zxaH


Mick suggested on X that the objects were flies. I initially thought they'd be completely out of focus, but I decided to recreate the setup in Blender using all the provided data.

I used an 85mm lens at f/5.6 on a 7008 × 4672 photo. The camera was placed where I believe the shot was taken, and I moved the plane backward until the scale matched.
And guess what? A 1.5 cm fly, 80 meters away, would actually still be in focus - and the right size too!

 

[FatPhil]

I used an 85mm lens at f/5.6 on a 7008 × 4672 photo. The camera was placed where I believe the shot was taken, and I moved the plane backward until the scale matched.
And guess what? A 1.5 cm fly, 80 meters away, would actually still be in focus - and the right size too!

That shouldn't be too much of a surprise, it's pretty close to where I'd expect the hyperfocal distance to be:

? 85*85/(0.02*5.6)/1000
64.509

(Assuming a 0.02mm CoC, which is fairly common for a non-compact camera.)

 

[ThomasH]

That shouldn't be too much of a surprise, it's pretty close to where I'd expect the hyperfocal distance to be:

? 85*85/(0.02*5.6)/1000
64.509

(Assuming a 0.02mm CoC, which is fairly common for a non-compact camera.)

Maybe it's because an 85mm at 1.4 has a really really shallow DOF I thought so, but of course that doesn't matter when it's at f/5.6
Also if it had been a 300 or 400mm you wouldn't have seen a fly, but he digital zooms in quite much in the example.

 

[Kyle Ferriter]

I used an 85mm lens at f/5.6 on a 7008 × 4672 photo. The camera was placed where I believe the shot was taken, and I moved the plane backward until the scale matched.

How far away did the plane end up from the camera, in terms of slant distance? I have a 100mm f/5.6 lens and live near an airport...

 

[Ann K]

And guess what? A 1.5 cm fly, 80 meters away, would actually still be in focus - and the right size too!

OMG, where on earth are you posting from, that you have 1.5 cm flies?? Half a centimeter would be about the limit here. :0

 

[jarlrmai]

Not sure where you are based but Tabanus sudeticus the Giant Dark Horsefly is 25mm and is commonly found in Europe.

North America has some very large robber flies as well.

 

[JMartJr]

And of course there are hornets, beetles, cicadas...

 

[ThomasH]

How far away did the plane end up from the camera, in terms of slant distance? I have a 100mm f/5.6 lens and live near an airport...

600 meters.

 

[ThomasH]

OMG, where on earth are you posting from, that you have 1.5 cm flies?? Half a centimeter would be about the limit here. :0

Hahaha, Denmark. I just started out with a 1,5 cm sphere because I wanted to be sure I could see it, when placing it in front of the camera.

Maybe this: https://en.wikipedia.org/wiki/Flesh_fly
But it could be any kind of flying bug, there a lot of bugs larger than 15 mm

 

[Kyle Ferriter]

600 meters.

Thanks.

The American Horsefly is relatively large and common (and their bites are very annoying).

https://bugguide.net/node/view/17587