DOF preview in OVFs of DSLRs is crippled
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From: Alfred Molon on 18 Jun 2008 06:42 In article <g38vef$25lq$1(a)agate.berkeley.edu>, Ilya Zakharevich says... > But if one forgets this piece of illiteracy, the conclusion of the > paper holds... And that is the problem. I'm about to switch to a DSLR (from the Sony R1) and the more I learn about DLSRs, the less impressed I am. Problems with DLSRs include: 1. Front focus/back focus issues: this problem simply does not exist in a camera with contrast AF 2. Mirror slap vibrations: you are forced to use MLU which not all DSLRs offer. Problem does not exist in compacts... 3. DLSR Viewfinder which could be misaligned with the main sensor resulting in tilted images. Problem does not exist in compacts. 4. Optical viewfinder not showing 100% of the scene (this is really pathetic - any camera with live preview shows 100%) 5. Optical viewfinder being too dark if you use DOF preview 6. DOF preview being inaccurate anyway for checking DOF The only solution to all these problems is to have live preview on a high res LCD screen or EVF. -- Alfred Molon ------------------------------ Olympus 50X0, 8080, E3X0, E4X0, E5X0 and E3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: David J Taylor on 18 Jun 2008 12:13 Alfred Molon wrote: > In article <g38vef$25lq$1(a)agate.berkeley.edu>, Ilya Zakharevich > says... > >> But if one forgets this piece of illiteracy, the conclusion of the >> paper holds... > > And that is the problem. I'm about to switch to a DSLR (from the Sony > R1) and the more I learn about DLSRs, the less impressed I am. > Problems with DLSRs include: > > 1. Front focus/back focus issues: this problem simply does not exist > in a camera with contrast AF > 2. Mirror slap vibrations: you are forced to use MLU which not all > DSLRs offer. Problem does not exist in compacts... > 3. DLSR Viewfinder which could be misaligned with the main sensor > resulting in tilted images. Problem does not exist in compacts. > 4. Optical viewfinder not showing 100% of the scene (this is really > pathetic - any camera with live preview shows 100%) > 5. Optical viewfinder being too dark if you use DOF preview > 6. DOF preview being inaccurate anyway for checking DOF > > The only solution to all these problems is to have live preview on a > high res LCD screen or EVF. Alfred, Whilst you are theoretically correct about these issues, in practice: 1 - contrast AF is desperately slower than phase-detect AF. 2 - not an issue for 99% of my photos. 3, 4 - are you sure that all compacts, and live-view cameras, give exactly 100% framing, and don't allow some margin? 5 - Perhaps, but it depends on just what is "too dark" in particular circumstances. 6 - That's a function of a particular viewfinder design, not a generic defect. LCD screens can be very poor in daylight, and require that you focus your eyes closely, and/or hold the camera in a poor position. EVFs - at their present resolution - are a very poor substitute for an optical viewfinder. They can have an advantage in low-light level conditions where the gain-up feature allows a brighter display than direct view, but ii is suitable for framing only, not for any critical judgements. As you will know, I have used both types. Cheers, David
From: Cynicor on 18 Jun 2008 12:19 Alfred Molon wrote: > In article <g38vef$25lq$1(a)agate.berkeley.edu>, Ilya Zakharevich says... > >> But if one forgets this piece of illiteracy, the conclusion of the >> paper holds... > > And that is the problem. I'm about to switch to a DSLR (from the Sony > R1) and the more I learn about DLSRs, the less impressed I am. Problems > with DLSRs include: > > 1. Front focus/back focus issues: this problem simply does not exist in > a camera with contrast AF > 2. Mirror slap vibrations: you are forced to use MLU which not all DSLRs > offer. Problem does not exist in compacts... > 3. DLSR Viewfinder which could be misaligned with the main sensor > resulting in tilted images. Problem does not exist in compacts. > 4. Optical viewfinder not showing 100% of the scene (this is really > pathetic - any camera with live preview shows 100%) > 5. Optical viewfinder being too dark if you use DOF preview > 6. DOF preview being inaccurate anyway for checking DOF > > The only solution to all these problems is to have live preview on a > high res LCD screen or EVF. Conclusion: Cell phone cameras outclass the Nikon D3.
From: Ray Fischer on 18 Jun 2008 12:40 Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <g38vef$25lq$1(a)agate.berkeley.edu>, Ilya Zakharevich says... > >> But if one forgets this piece of illiteracy, the conclusion of the >> paper holds... > >And that is the problem. I'm about to switch to a DSLR (from the Sony >R1) and the more I learn about DLSRs, the less impressed I am. When you worship technology you will be disappointed. > Problems >with DLSRs include: > >1. Front focus/back focus issues: this problem simply does not exist in >a camera with contrast AF How fast can a P&S focus? A DSLR takes maybe 1/5th of a second. >2. Mirror slap vibrations: you are forced to use MLU which not all DSLRs >offer. Problem does not exist in compacts... It doesn't exist in SLRs, either. >3. DLSR Viewfinder which could be misaligned with the main sensor >resulting in tilted images. Problem does not exist in compacts. Vastly higher resolution in the SLR's viewfinder. >4. Optical viewfinder not showing 100% of the scene (this is really >pathetic - any camera with live preview shows 100%) NO camera with live preview shows 100% of the scene. They all show very low resolution versions of the scene. >5. Optical viewfinder being too dark if you use DOF preview LCD screen completely unviewable in bright light. >6. DOF preview being inaccurate anyway for checking DOF That one is completely false. >The only solution to all these problems is to have live preview on a >high res LCD screen or EVF. When you find a camera that has a 6MP LCD screeen you let us know. -- Ray Fischer rfischer(a)sonic.net
From: Alfred Molon on 18 Jun 2008 13:20
In article <48593a81$0$17227$742ec2ed(a)news.sonic.net>, Ray Fischer says... > >2. Mirror slap vibrations: you are forced to use MLU which not all DSLRs > >offer. Problem does not exist in compacts... > > It doesn't exist in SLRs, either. Then why do some DSLRs have MLU? Besides I saw some sample images, with/without MLU where you could clearly see that the image taken without MLU was soft. > >3. DLSR Viewfinder which could be misaligned with the main sensor > >resulting in tilted images. Problem does not exist in compacts. > > Vastly higher resolution in the SLR's viewfinder. > > >4. Optical viewfinder not showing 100% of the scene (this is really > >pathetic - any camera with live preview shows 100%) > > NO camera with live preview shows 100% of the scene. They all show > very low resolution versions of the scene. They do. 100% means that they show the whole scene being captured, without cutting away the borders. > >5. Optical viewfinder being too dark if you use DOF preview > > LCD screen completely unviewable in bright light. Then use the EVF. > >6. DOF preview being inaccurate anyway for checking DOF > > That one is completely false. Completely true. See the link I posted: http://www.dphotoexpert.com/2007/09/21/live-view-versus-the-cheating- dslr-viewfinder/ > >The only solution to all these problems is to have live preview on a > >high res LCD screen or EVF. > > When you find a camera that has a 6MP LCD screeen you let us know. 1024x768 RGB pixel would be sufficient. Actually, forgot to mention in my previous post that it's a shame that DLSRs have no movie mode. But I guess it's just a matter of time until DSLRs catch upo here, because most new DSLRs have a live view capable sensor. -- Alfred Molon ------------------------------ Olympus 50X0, 8080, E3X0, E4X0, E5X0 and E3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site |