Re: Film slr lenses on DSLR question

Noons wrote:
On Oct 13, 6:02 am, "\(used to be\) Fat Sam"
<samandja...@xxxxxxxxxxxxxxxxxxxxx> wrote:

Speaking to an old mate of mine, he told me that a lot of older film
SLR wide angle lenses can cause problems on DSLR's because of the
angle the light strikes the sensor at.


Ah yes: good old "light bends differently" with dslrs. It'd be a
good laugh if it didn't show the total ignorance of these folks.
Light bends the SAME way in a given media, always!
The fact there is a digital sensor at the end of the optical path
makes
NO DIFFERENCE whatsoever to the physical laws of how light bends
in the lens. NONE, whatsoever!

That wasn't what he was saying.
He was talking about the angle at which the light strikes the imaging plane.
Not that it varies from camera to camera, but more that it varies from lens
to lens.

He tells me that a digital sensor has a shiny surface compared to
the more matt surface of traditional film, so you tend to get more
of the light reflecting back off the sensor instead of being
absorbed by it.

That is indeed true and has nothing to do with light "bending".

I'm confused as to why you keep referring to "bending".
You mentioned bending, not me.

That's why lenses made specifically for digital cameras
have multi-coating on both ends of the lens.
And that is precisously the only major difference in design
between them. Of course, those with a vested interest
inb selling you the latest, whitest and brightest will jump in
with all sorts of crap arguments. You may follow them
if you so wish. Or do like any sensible person has:
get yourself some lenses of both types, good quality,
and experiment ON YOUR OWN. Try it: older lenses are
not that expensive that the proposition is far fetched.
I'll promise one thing: you better have a VERY good quality
dslr and use a tripod if you want to see ANY differences.

He did stress that this was only with certain wide angle lenses, and
definitely not a universal problem.

It's actually a universal problem: the sensor does not stop
reflecting light back because a different lens is mounted!

It's amazing the amount of urban myth created by the peddlers
of digital over the years...

He's not a peddler. He's a very succesfull photographer.
I feel you have misunderstood what I was saying.
Or perhaps I didn't word it very well.


.

Relevant Pages

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