CDMc

CDMc

Lives in United Kingdom United Kingdom
Joined on Apr 16, 2007

Comments

Total: 7, showing: 1 – 7
In reply to:

yabokkie: > sdyue,

a simple rule that solves all the equivalent calculations is to use sqrt(sensor-area-ratio) as a factor for both focal length and f-number, like

Pana PZ 14-42/3.5-5.6 ------> 27.4-82.3/6.9-11.0 equiv.
Canon G1 X (15.1-60.4/2.8-5.8) ------> 28-112/5.1-10.5 equiv.
Sony E18-55/3.5-5.6 ------> 27.6-84.4/5.4-8.6 equiv.

so G1 X is the fastest/brightest one (lower noise, shallower field) at 28mm FOV with an equivallent f-number of f/5.1 (not fast/bright at all in 35mm FF standard) .

the "equivallent f-number" is really the aperture size at a given FOV,
which determines everything f-number does like SNR (shot noise) or DOF for instant comparison across different formats.

If only!

I'm starting to get fed-up with all this. the equivalent aperture does not determine everything - exposure triangle is still ISO-Aperture-Shutter Speed, the aperture is the actual none of this equivalent nonsense. equivalence is fine for DOF, but that's it

hope this helps

Direct link | Posted on Feb 14, 2012 at 21:41 UTC
In reply to:

CDMc: ? they're available all over the UK ? Many of the main online retailers have them available, and prices are starting to reflect that supply

They are available all over -

fotosense - i've used them personally very good
Mathers - very good reputation
SRS microsystems - ditto

etc

Direct link | Posted on Jan 19, 2012 at 19:04 UTC
In reply to:

kon23: Nice to see them on the ball with updates.
I've got my eye on a Panasonic GX1 or Sony Nex 5n.
At the moment in the UK you cannot get either of these for loving or money!
Sony lost their factory that supplies the sensors for the Nex 5n in the tsunami and I think Panasonic have some kind of major problem too.

I've been told everywhere that a Sony Nex5n with twin lens kit or the GX1 with X lens won't be coming into stock until late February. Even then, it's not guaranteed.

:(

They are available all over -

fotosense - i've used them personally very good
Mathers - very good reputation
SRS microsystems - ditto

etc

Direct link | Posted on Jan 19, 2012 at 19:02 UTC

? they're available all over the UK ? Many of the main online retailers have them available, and prices are starting to reflect that supply

Direct link | Posted on Jan 18, 2012 at 21:46 UTC as 5th comment | 4 replies
In reply to:

TxCamFan: This wasn't up yesterday. Why did you back date it? It would be nice to see the announcements with the newest on top regardless of how exciting they are.

Agree

Consipiracy Theory anyone? have a look at the release list for Panny, these are not even on it.

Edit: Just checked - still not showing in the product list

Direct link | Posted on Jan 11, 2012 at 20:21 UTC

This confirms a fewthings for me, and one of the unsung reasons why i'm so happy with m43 - CDAF - the focus is in a different league than the PDAF on my old 40D.

Once the issue of better CAF is solved, I wonder if Canikon will move to a similar system, after all, the returns and services must cost them a fortune, else why would they have included micro-adjust.

Direct link | Posted on Oct 5, 2011 at 22:12 UTC as 33rd comment
On Sony SLT-A77 studio comparison samples article (226 comments in total)
In reply to:

Carsten Saager: Interesting to see that even with the penalty of the translucent mirror the A77 wipes the floor with the APS-C competition - the 5dmkII only does a little bit better (thanks to its full-frame sensor)

Good job Sony! Curious what Canikon have up in their sleeves to counter that - though it won't last for long. In 5 years I'll find myself hard pressed to add to my Nikon gear if Sony can keep up this innovation speed (and in 10 years Canikon will become just nostalgia)

Not sure where you are looking? not seeing that at all

I compared to the GH2 in RAW and JPG at 1600 and 3200 - a pixel too far?

Direct link | Posted on Sep 26, 2011 at 21:24 UTC
Total: 7, showing: 1 – 7