How good is the RX100 Lens?

Started Sep 5, 2012 | Discussions thread
SolomonRa
New MemberPosts: 20
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Re: How good is the RX100 Lens?
In reply to EinsteinsGhost, Sep 9, 2012

EinsteinsGhost wrote:

SolomonRa wrote:

EinsteinsGhost wrote:

SolomonRa wrote:

EinsteinsGhost wrote:

RX100 maintains at least 1-stop advantage over the typical DSLR kit zoom lenses.

Sounds about right.

1 stop difference @35mm (f2.8 RX100 and f4.0 Sony kit)

18-55 kit zooms used on APS-C DSLRs are f/5.6 at 55mm (I believe f/5 at 50mm). So, the 1+ stop advantage still holds.

I thought that you won't forget to convert to the full frame equivalent.
1.55x Sony APS-C crop... 50mm = 77mm ... Sony kit f5@77mm and RX100 f4@66mm
So, where have you found that 1+ stop advantage?

I did realize that after I couldn't edit. Numbers (53mm, 35mm equivalent)
RX100: 3.5
18-55: 4.5 (35mm mark)
That is 1-stop.

EinsteinsGhost, are you sure that there is 1 full stop between f3.5 and f4.5?

http://en.wikipedia.org/wiki/F-number

EinsteinsGhost wrote:

nosnoop wrote:

If your way of comparison shows that iPhone 4S has an advantage over D7000, don't you think that's seriously flawed?
I did, and that's why I am explaining to you that's invalid and flawed.

Simply repeating a belief isn't explaining it. You haven't explained why RX100 produced a brighter image at lower ISO than D7000, when both have the same shutter speed.
Why is RX100 image brighter at a lower ISO than D7000?

Probably because RX100 was set to f1.8 and D7000 was set to f2.8.

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