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What M8 and Noctilux can do for me at f/1


drstefanlenz

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The Noctilux has much shallower depth of field. At 10m, wide open, the depth of field is 2.475m. For the 35mm Summilux, it's 8.636m. Both figures are from Leica's lens specifications which do not take account of the reduced DoF from the smaller sensor size.

 

Mind you, the 75/1.4 has a depth of field of just 1.682 metres.

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The Noctilux has much shallower depth of field. At 10m, wide open, the depth of field is 2.475m. For the 35mm Summilux, it's 8.636m. Both figures are from Leica's lens specifications which do not take account of the reduced DoF from the smaller sensor size.

 

Mind you, the 75/1.4 has a depth of field of just 1.682 metres.

 

Hi Mark,

Does the sensor size affect DoF? I thought DoF should be the same, it's just that the image get cropped:confused:

Thanks.

Mike

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Hi Mark,

Does the sensor size affect DoF? I thought DoF should be the same, it's just that the image get cropped:confused:

Thanks.

Mike

 

 

Mike,

 

The difference is the in the circle of confusion - the cropped sensor has less DOF for the same lens and print size. You can play with these numbers yourself here:

 

Online Depth of Field Calculator

 

You can also see the DOF differences decreases with decreasing subject distance. 10 meters is quite far for most of these extreme shallow DOF examples. At a more usual 3 meters the difference between the Nocti a Summilux 50 shrinks to a few centimeters ( around 7 for the M8).

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{snipped}. At a more usual 3 meters the difference between the Nocti a Summilux 50 shrinks to a few centimeters ( around 7 for the M8).

 

But they draw quite differently. I love the Noctilux on the M8, and mine seems to be working just fine :)

EDIT--that's ISO 1250 at f1.0@ 1/16s, btw, so you know it's dark in there!

 

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Jamie,

 

That's what this lens is made for. Excellent way to use this lens to the fullest!

 

"What M8 and Noctilux can do for me at f/1"

A lot of blur images if you shoot in brightly lit areas. :p

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David,

 

That's a straight-through ACR conversion with the defaults, and then a dodge and burn to turn it into what *I* saw and not what the *camera* saw.

 

It's so hard to convince people that as the ISO goes up you need to make sure your exposure actually gets enough photons to the sensor :) It's counter-intuitive from the film days, but that's because my high speed film was usually around 400 ASA and the noise level is low, so when the lights went down you upped the film speed and pushed in post :)

 

With digital, you get decreasing DR as ISO goes up; for me the sweet spot on the M8 is 640 where I still have a stop in the shadows to play with, but lower ISOs on the M8 can be pushed around a lot more.

 

Still, when the light is very low, and the important DR flat, you can push to higher ISOs with great results.

 

"Out of the camera" that scene is much flatter, but not more noisy, if you see what I mean. I didn't pull shadow detail at all (it fact it got buried a wee bit) but I did raise the midtones and highlights (and blew out the couch) because I could still, even at 1250.

 

This is sometimes why every time a new FW comes out people think there's less noise at higher ISOs--they do a test exposure at 2500 in good light and in good low contrast light 2500 on the M8 is just fine.

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