E-P1 with 20 f/1.7

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Archive 2009 · E-P1 with 20 f/1.7

mawz
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p.2 #1 · E-P1 with 20 f/1.7

andrewd01 wrote:
mawz wrote:

Yes, it comes with SilkyPix but as long as you have a version of PS that supports ACR (CS and later) you can get the correction via the latest version of Adobe DNG converter (just be sure to set it to ACR 2.4 and Later for the compatibility settings).

I personally use CS3 and use DNG converter to get support for my E-30 and G1.

Do you prefer the results from CS3 over SilkyPix? I have a G1 but haven't tried processing in CS3. Wasn't overly impressed from the results from SilkyPix.

Having used SilkyPix in the past, it didn't even get installed when I got the G1. I'm not willing to deal with its poor performance and interface when I already had CS3 and knew it did a good job with conversions.

Oct 18, 2009 at 12:38 PM

mawz
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p.2 #2 · E-P1 with 20 f/1.7

Makten wrote:
mawz wrote:
ACR/LR and SilkyPix (as well as Olympus Studio, if you're a masochist) do automatic distortion correction for all m43 lenses on all m43 bodies.

Not on my computer. The 17/2.8 distorts like hell, and it's very visible in ACR.

Hmm, that's odd. Shots from the 17 are certainly corrected in ACR with the G1. I thought that the E-P1 was being treated the same way. Perhaps not.

Oct 18, 2009 at 12:40 PM

Sam Bennett
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p.2 #3 · E-P1 with 20 f/1.7

The 20mm really couldn't be much better, IMO. Sharp, contrasty, buttery-smooth bokeh, close focusing and it's tiny? What more could you ask for? Well, one thing - a bayonet-mount, reversible hood would have made it perfect.

Oct 18, 2009 at 05:38 PM

Makten
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p.2 #4 · E-P1 with 20 f/1.7

Sam Bennett wrote:
The 20mm really couldn't be much better, IMO. Sharp, contrasty, buttery-smooth bokeh, close focusing and it's tiny? What more could you ask for? Well, one thing - a bayonet-mount, reversible hood would have made it perfect.

I'd want it to be at least one stop faster and even smaller, which should be possible. The barrel is huge compared to the entrance pupil. Ugly, to say the least.

Oct 18, 2009 at 06:54 PM

Jman13
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p.2 #5 · E-P1 with 20 f/1.7

Continuing to dig this lens.

Wide open:

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100% crop:

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My daughter, wide open at ISO 1600:

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Oct 21, 2009 at 12:05 AM

Spyro P.
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p.2 #6 · E-P1 with 20 f/1.7

Nice work, I love the dispatch building photo

The lens looks like a keeper.

Oct 21, 2009 at 12:17 AM

Jman13
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p.2 #7 · E-P1 with 20 f/1.7

Thanks! Some pics of the lens on the body. Many have complained about the looks of the 20 on the E-P1, but I find it quite nice. It looks better in person than it does in pictures, though.

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Oct 21, 2009 at 02:24 AM

philber
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p.2 #8 · E-P1 with 20 f/1.7

I tried the same lens on the Panasonic GF1. There is no doubt in my mind that this is a very nice lens for this type of camera. The cam is interesting as well, though I am debating whether to spend the price for it plus a short tele, because that is getting to be expensive

Oct 21, 2009 at 06:38 AM

kahren
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p.2 #9 · E-P1 with 20 f/1.7

do you have any comparison pictures with 20mm vs 17mm

Nov 12, 2009 at 10:26 AM

kevinsullivan
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p.2 #10 · E-P1 with 20 f/1.7

The 20mm really couldn't be much better

I know you mean "technically." But $400 for a normal FOV, f/1.8 lens -- yikes. If it were f/1.4 maybe, but f/1.8? Me thinks the vendors is perhaps recouping its R&D costs.

Nov 12, 2009 at 01:22 PM

mawz
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p.2 #11 · E-P1 with 20 f/1.7

kevinsullivan wrote:
The 20mm really couldn't be much better

I know you mean "technically." But $400 for a normal FOV, f/1.8 lens -- yikes. If it were f/1.4 maybe, but f/1.8? Me thinks the vendors is perhaps recouping its R&D costs.

Note the build quality on the 20 is excellent, it's much better built than your average kit lens.

Comparing to closest equivalent for 35mm FF, which would be the CV Ultron 40/2 rather than one of the cheap AF 50/1.8's (which are cheap due to poor build and massive sales volumes), it's a little lighter built, a half-stop faster, adds AF and costs about the same in the US.

Nov 12, 2009 at 02:50 PM

Alex
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p.2 #12 · E-P1 with 20 f/1.7

I'm curious how telecentric this lens is. Could somebody measure the diameter of aperture as it appears from the back and from the front of the lens and provide the ratio of the first to the second?

The focal length multiplied by this ratio is the distance from the exit pupil to the focal plane. The larger this distance is, the more normal is the angle of the light hitting the sensor. For my Olympus 17mm this distance is ~35mm. This is a lot for such a thin lens. It seems that Olympus take the telecentricity seriously. What about Panasonic?

Alex

Nov 12, 2009 at 03:50 PM

fourfa
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p.2 #13 · E-P1 with 20 f/1.7

Just checked with my calipers and my friend's lens: from the front, 0.433", from the back, 0.572".

Ratio: 1.32
Times focal length (assuming a true 20mm): 26.4mm

Nov 12, 2009 at 07:23 PM

alexandre
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p.2 #14 · E-P1 with 20 f/1.7

kevinsullivan wrote:
The 20mm really couldn't be much better

I know you mean "technically." But $400 for a normal FOV, f/1.8 lens -- yikes. If it were f/1.4 maybe, but f/1.8? Me thinks the vendors is perhaps recouping its R&D costs.

Or miniaturization and early adoption have a cost per se.
If we were talking about a standard Leica lens, $400 would be a 'yikes bargain' lens

Nov 12, 2009 at 08:11 PM

Alex
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p.2 #15 · E-P1 with 20 f/1.7

fourfa wrote:
Just checked with my calipers and my friend's lens: from the front, 0.433", from the back, 0.572".

Ratio: 1.32
Times focal length (assuming a true 20mm): 26.4mm

That is quite interesting. There are quite a lot of reports that wide angle rangefinder lenses don't perform well on mFT. The common explanation is that the digital sensors are not designed for oblique light angles. CV 28/2 is very often mentioned as a poor performer because of this. For this symmetrical lens the distance between the exit pupil and the focal lane should be about 28mm which is practically the same as for the Panasonic. The angles should be pretty much the same. I'm puzzled

Alex

Nov 13, 2009 at 12:59 AM

mawz
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p.2 #16 · E-P1 with 20 f/1.7

Alex wrote:
fourfa wrote:
Just checked with my calipers and my friend's lens: from the front, 0.433", from the back, 0.572".

Ratio: 1.32
Times focal length (assuming a true 20mm): 26.4mm

That is quite interesting. There are quite a lot of reports that wide angle rangefinder lenses don't perform well on mFT. The common explanation is that the digital sensors are not designed for oblique light angles. CV 28/2 is very often mentioned as a poor performer because of this. For this symmetrical lens the distance between the exit pupil and the focal lane should be about 28mm which is practically the same as for the Panasonic. The angles should be pretty much the same. I'm puzzled

Alex

People are generalizing too much. There's issues with a number of RF wide-angle designs on m43, but a number of other designs do not have the same issues. The CV 28/2 is ust about the only CV wide with this issue. Even the CV 28/1.9 generally doesn't suffer for it and none of the slower CV wides and ultra-wides have the issue. Many Leica wides have problems however. Distance from the rear element to the sensor seems to be the primary determinant.

Nov 13, 2009 at 01:44 AM

fourfa
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p.2 #17 · E-P1 with 20 f/1.7

how well does the 35mm/1.2 work?

Nov 13, 2009 at 02:46 AM

CVickery
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p.2 #18 · E-P1 with 20 f/1.7

mawz wrote:

People are generalizing too much. .... Distance from the rear element to the sensor seems to be the primary determinant.

I think that's why Alex is puzzled. The distance from the rear element to the sensor with the CV28/2 (a poor performer on mFT) and the Pany 20/1.7 (an excellent performer on mFT) are almost the same. If the distance from the sensor is the primary determinant this result doesn't make sense. If anything the 20/1.7 is at a disadvantage...it's wider, faster and slightly closer to the sensor.

My suspicion is that Alex's approach is valid, but perhaps only for lenses not designed for mFT. It has been suggested that the mFT lenses have been designed to be corrected by the software. The performance of this lens may be an indication of how well this approach to lens design can work.

Nov 13, 2009 at 03:21 AM

mawz
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p.2 #19 · E-P1 with 20 f/1.7

CVickery wrote:
mawz wrote:

People are generalizing too much. .... Distance from the rear element to the sensor seems to be the primary determinant.

I think that's why Alex is puzzled. The distance from the rear element to the sensor with the CV28/2 (a poor performer on mFT) and the Pany 20/1.7 (an excellent performer on mFT) are almost the same. If the distance from the sensor is the primary determinant this result doesn't make sense. If anything the 20/1.7 is at a disadvantage...it's wider, faster and slightly closer to the sensor.

My suspicion is that Alex's approach is valid, but perhaps only for lenses not designed for mFT. It has been suggested that the mFT lenses have been designed to be corrected by the software. The performance of this lens may be an indication of how well this approach to lens design can work.

Actually Alex has been calculating based on exit pupil rather than rear element. The rear element of say the Oly 17 is around 20mm from the sensor, not 35mm. The same goes for the 28/1.9. I'm not sure about the 20/1.7 or CV 28/2 as I don't have those in front of me.

Nov 13, 2009 at 03:26 AM

CVickery
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p.2 #20 · E-P1 with 20 f/1.7

OK, I admit I'm way over my head here and it probably shows. It would seem to me that the distance from the sensor to the exit pupil, rather than the rear element, would be what detemines the angle at which light would hit the sensor (no doubt there can be other factors, perhaps the diameter of the exit pupil??).

Nov 13, 2009 at 03:38 AM

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