FP ISO 64000

Started 3 months ago | Discussions thread
Scottelly Forum Pro • Posts: 16,328
Re: FP ISO 64000

xpatUSA wrote:

Scottelly wrote:

xpatUSA wrote:

Ceistinne wrote:

Roger wrote:

Hi gang how are you doing?? Well I hope. Here's the FP at ISO 64000



Roger J.


Not bad at 64,000 ISO.


Curious how the ISO steps have departed from doubling up each time, e.g. 100, 200, 400 ... and now have values like 64000 where the digits "64" are no doubt there for some reason - perhaps aimed at making some shooters feel comfortable - a bit like "ISO" itself!

... 800, 1600, 3200, 6400, 12800, 2560, 51200, ???, 102400 ...

I don't understand Isn't 800 twice 400, and isn't 1600 twice 800?

They are.

I mean it does double.

It does - up to a point ...

Did you say, ". . . the ISO steps have departed from doubling up each time . . ." . . . ?

I did.

You proceeded with a series that doubled, including 3200 to 6400 to 12800 to 25600 to 51200. I don't know what the ??? means, but then you finished the series with 102400, which is double the previous number of 51200.

That I did.

I don't unerstand why you made this post Ted. Sorry. What do you mean?

I meant that 64000 is not part of the aforesaid well-established series.

Oh, I see. Yeah, I wonder why, if they just wanted to make things easier by using "round" numbers, why they didn't just step up to 50,000 from 25600. At that point they could then continue to double with simple numbers, like 100,000, 200,000, and 400,000. In the future they could add 1 Million, 2 Million, and 4 Million.

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Scott Barton Kennelly

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