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#1
July 11th 04, 03:51 PM
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DSLR lenses
Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes,
how much do they cost ? Another issue is that DSLRs have a pixel pitch of 7.7 micrometer, which corresponds to 64 lp/mm. Most SLR lenses, have a not too high MTF at 64 lp/mm (0.5 or lower) and I'd guess that a zoom lens has even lower MTF values. Am I right ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html 
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#2
July 11th 04, 04:07 PM
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DSLR lenses
Alfred Molon wrote:
Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? By the way, just did the following quick test (indoors) with my current camera (Olympus 5050). Set the camera to aperture priority and obtained the folowing readings: ISO 64, F1.8, 1/10 s ISO 64, F3.6, 1/2.5s ISO 64, F4, 1/2s ISO 400, F4, 1/10s In other words, with a zoom which starts at F4 you are forced to shoot at ISO 400 to get the same exposure time as at F1.8 at ISO 64. Basically if your DSLR zoom lens starts at F4, you are forced to shoot at ISO 400 in low light and the advantage of the lower DSLR noise (with respect to "compact" cameras) is gone. -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html
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#3
July 11th 04, 04:07 PM
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DSLR lenses
Alfred Molon wrote:
Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? By the way, just did the following quick test (indoors) with my current camera (Olympus 5050). Set the camera to aperture priority and obtained the folowing readings: ISO 64, F1.8, 1/10 s ISO 64, F3.6, 1/2.5s ISO 64, F4, 1/2s ISO 400, F4, 1/10s In other words, with a zoom which starts at F4 you are forced to shoot at ISO 400 to get the same exposure time as at F1.8 at ISO 64. Basically if your DSLR zoom lens starts at F4, you are forced to shoot at ISO 400 in low light and the advantage of the lower DSLR noise (with respect to "compact" cameras) is gone. -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html
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#4
July 11th 04, 04:18 PM
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DSLR lenses
"Alfred Molon" wrote in message
... Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? There are plenty of f2.8 zooms out there- the cheapest from Tamron, Tokina and Sigma are 24/28-70/80mm and cost about £300 in the UK. There was one 28-70mm f2.6 zoom from Angenieux that might be possible to find, IIRC it was made in EF fit- certainly Nikon AF. AFAIK there is nothing faster available in EF mount. -- Martin Francis http://www.sixbysix.co.uk "Go not to Usenet for counsel, for it will say both no, and yes, and no, and yes...."
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#5
July 11th 04, 04:18 PM
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DSLR lenses
"Alfred Molon" wrote in message
... Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? There are plenty of f2.8 zooms out there- the cheapest from Tamron, Tokina and Sigma are 24/28-70/80mm and cost about £300 in the UK. There was one 28-70mm f2.6 zoom from Angenieux that might be possible to find, IIRC it was made in EF fit- certainly Nikon AF. AFAIK there is nothing faster available in EF mount. -- Martin Francis http://www.sixbysix.co.uk "Go not to Usenet for counsel, for it will say both no, and yes, and no, and yes...."
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#6
July 11th 04, 04:46 PM
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DSLR lenses
"Alfred Molon" wrote in message ... Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? Another issue is that DSLRs have a pixel pitch of 7.7 micrometer, which corresponds to 64 lp/mm. Most SLR lenses, have a not too high MTF at 64 lp/mm (0.5 or lower) and I'd guess that a zoom lens has even lower MTF values. Am I right ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html Yes, f2.8 zoom lenses exist for the 300D, since it uses the same EF mount lenses as any Canon AF body film or digital. The only exception is that the 300D can utilize the 18-55 EF-S, which the other Canons cannot. prices range from a low of about $400 for 28-70 f2.8 lenses from third party mfrs to about $1600 for the Canon 70-200 f2.8L IS USM. -- Skip Middleton http://www.shadowcatcherimagery.com
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#7
July 11th 04, 04:56 PM
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DSLR lenses
"Alfred Molon" wrote in message ... Alfred Molon wrote: Do bright zoom lenses (F2-2.8 or similar) exist for the 300D ? If yes, how much do they cost ? By the way, just did the following quick test (indoors) with my current camera (Olympus 5050). Set the camera to aperture priority and obtained the folowing readings: ISO 64, F1.8, 1/10 s ISO 64, F3.6, 1/2.5s ISO 64, F4, 1/2s ISO 400, F4, 1/10s In other words, with a zoom which starts at F4 you are forced to shoot at ISO 400 to get the same exposure time as at F1.8 at ISO 64. Basically if your DSLR zoom lens starts at F4, you are forced to shoot at ISO 400 in low light and the advantage of the lower DSLR noise (with respect to "compact" cameras) is gone. -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html Ah, doing a little trolling on the side, eh? ;-) IF, indeed, your DSLR lens did start at f4, you would have a point. But many of them don't. And if your DSLR lens has image stabilization, you pick up two or three stops, there. Most of us can't hand hold at 1/2 sec, some can, but at that speed, you're on a tripod, anyway, so the speed advantage diminishes. As an example, my zoom lens "collection" includes a 17-35 f2.8-4 (f2.8 at the wide end), a 28-70 f2.6-2.8, a 28-135 f3.5-5.6 IS and a 100-400 f4.5-5.6L IS. You don't say at what focal lengths your readings were taken, but that lens on the 5050 is a variable aperture, isn't it? So, I'm guessing that the readings were taken at the wide (35mm?) end, where it is easier to hand hold, though. And what aperture does it default to at the long end? Improved optics in the SLR lenses makes up for a lot vs point and shoot lenses, too, although Oly is known for some stellar glass. -- Skip Middleton http://www.shadowcatcherimagery.com
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#8
July 11th 04, 05:52 PM
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DSLR lenses
Skip M wrote:
You don't say at what focal lengths your readings were taken, but that lens on the 5050 is a variable aperture, isn't it? So, I'm guessing that the readings were taken at the wide (35mm?) end, where it is easier to hand hold, though. And what aperture does it default to at the long end? It's F1.8-2.6, and the readings were taken at the wide end. -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html
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#9
July 11th 04, 05:56 PM
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DSLR lenses
Martin Francis wrote:
There are plenty of f2.8 zooms out there- the cheapest from Tamron, Tokina and Sigma are 24/28-70/80mm and cost about £300 in the UK. There was one 28-70mm f2.6 zoom from Angenieux that might be possible to find, IIRC it was made in EF fit- certainly Nikon AF. AFAIK there is nothing faster available in EF mount. Good to know. So with a 24-70 you are around 38-105, assuming a crop factor of 1.5 ? By the way, the pixel pitch of a 300D is 7.7 micrometer, which corresponds to 64 lp/mm. How is the MTF of these affordable zooms at 64 lp/mm ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html
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#10
July 11th 04, 05:56 PM
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DSLR lenses
Martin Francis wrote:
There are plenty of f2.8 zooms out there- the cheapest from Tamron, Tokina and Sigma are 24/28-70/80mm and cost about £300 in the UK. There was one 28-70mm f2.6 zoom from Angenieux that might be possible to find, IIRC it was made in EF fit- certainly Nikon AF. AFAIK there is nothing faster available in EF mount. Good to know. So with a 24-70 you are around 38-105, assuming a crop factor of 1.5 ? By the way, the pixel pitch of a 300D is 7.7 micrometer, which corresponds to 64 lp/mm. How is the MTF of these affordable zooms at 64 lp/mm ? -- Alfred Molon ------------------------------ http://groups.yahoo.com/group/Olympus_405080/ Olympus 5050 resource - http://www.molon.de/5050.html Olympus 5060 resource - http://www.molon.de/5060.html Olympus 8080 resource - http://www.molon.de/8080.html
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