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tech / rec.photo.digital / Re: What might this lens be used for.

SubjectAuthor
* What might this lens be used for.Whisky-dave
+- What might this lens be used for.Alan Browne
+- What might this lens be used for.geoff
+- What might this lens be used for.David Taylor
`* What might this lens be used for.Alfred Molon
 `- What might this lens be used for.Whisky-dave

1
What might this lens be used for.

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Subject: What might this lens be used for.
From: whisky.dave@gmail.com (Whisky-dave)
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 by: Whisky-dave - Mon, 5 Jun 2023 11:41 UTC

I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !

https://photos.app.goo.gl/erxxqydNRQbHJCET8

Re: What might this lens be used for.

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 by: Alan Browne - Mon, 5 Jun 2023 17:32 UTC

On 2023-06-05 07:41, Whisky-dave wrote:
>
> I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !
>
> https://photos.app.goo.gl/erxxqydNRQbHJCET8

If you buy two you get a free camera.

--
“If you torture the data long enough, it will confess to anything."
-Ronald Coase

Re: What might this lens be used for.

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 by: geoff - Mon, 5 Jun 2023 22:00 UTC

On 5/06/2023 11:41 pm, Whisky-dave wrote:
>
> I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !
>
> https://photos.app.goo.gl/erxxqydNRQbHJCET8

Hand-held close-ups from a distance in a pitch-black moonless night ?

geoff

Re: What might this lens be used for.

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From: david-taylor@blueyonder.co.uk.invalid (David Taylor)
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Subject: Re: What might this lens be used for.
Date: Tue, 6 Jun 2023 07:32:25 +0100
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 by: David Taylor - Tue, 6 Jun 2023 06:32 UTC

On 06/06/2023 07:15, RichA wrote:
> On Monday, 5 June 2023 at 07:41:45 UTC-4, Whisky-dave wrote:
>> I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !
>>
>> https://photos.app.goo.gl/erxxqydNRQbHJCET8
> FAKE. It's not big enough. The front element would need to be at least 85 inches across. The Vera Rubin Telescope has the large

I could believe 4000 mm, f/3, but not E-mount!

--
Cheers,
David
Web: https://www.satsignal.eu

Re: What might this lens be used for.

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From: alfred_molon@yahoo.com (Alfred Molon)
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 by: Alfred Molon - Tue, 6 Jun 2023 16:26 UTC

Am 06.06.2023 um 08:15 schrieb RichA:
> On Monday, 5 June 2023 at 07:41:45 UTC-4, Whisky-dave wrote:
>> I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !
>>
>> https://photos.app.goo.gl/erxxqydNRQbHJCET8
>
> FAKE. It's not big enough. The front element would need to be at least 85 inches across. The Vera Rubin Telescope has the largest glass lenses ever made in it. 61 inches across.

Actually at least 13m (4m/0.3).
--
Alfred Molon

Olympus 4/3 and micro 4/3 cameras forum at
https://groups.io/g/myolympus
https://myolympus.org/ photo sharing site

Re: What might this lens be used for.

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Subject: Re: What might this lens be used for.
From: whisky.dave@gmail.com (Whisky-dave)
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 by: Whisky-dave - Thu, 8 Jun 2023 11:56 UTC

On Tuesday, 6 June 2023 at 17:26:53 UTC+1, Alfred Molon wrote:
> Am 06.06.2023 um 08:15 schrieb RichA:
> > On Monday, 5 June 2023 at 07:41:45 UTC-4, Whisky-dave wrote:
> >> I can't really think of a reason for this lens to exist , well it won't fit in my kit bag !
> >>
> >> https://photos.app.goo.gl/erxxqydNRQbHJCET8
> >
> > FAKE. It's not big enough. The front element would need to be at least 85 inches across. The Vera Rubin Telescope has the largest glass lenses ever made in it. 61 inches across.
> Actually at least 13m (4m/0.3).

For those that haven't sussed it, this is apparently an AI generated image.
Things I was impressed by are the overall look the shadows cast by the geezer and the lens, and also the lens reflection
ie. the image on the front lens element.
But where was the 'intelligence' in this, as you imply even a f1 4000mm lens would need to be ~4 metres across.

I remember in the late 70s Ziess made a ~210mm ~f0.3 equivalent lens which had an inbuild image intensifier
that could be used with film under starlight conditions.
Well the uses of this could be night time wildlife or military and at least be somewhat portable
Which is why I was wondering what a 4000mm lens with even at f1 could/would be used for if it could actually be made.

Oh and of course how much it would cost and weigh ;-)

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