Thought FF (k1) would give me. Significant increase in light gathering vs k70

Lord Lucan · 12-09-2017, 12:38 PM

Originally posted by D1N0

it is not very pragmatic to start talking about 35mm film. You smarty-pants remark only serves confusion.

You started talking about a lens (Pentax-M 20mm F4) which was designed for 35mm film. In that, its original design function, it was an ultra-wide lens, and I can show you Pentax catalogues in which it is described as such; can you show me a Pentax catalogue which describes it as "moderately wide"? Of course you can use it on an APS-C body when it then acts moderately wide, but that is not its native use. I'm baffled as to what you see as "smarty-pants" about this fact.

D1N0 · 12-10-2017, 12:57 AM

Originally posted by Lord Lucan

You started talking about a lens (Pentax-M 20mm F4) which was designed for 35mm film. In that, its original design function, it was an ultra-wide lens, and I can show you Pentax catalogues in which it is described as such; can you show me a Pentax catalogue which describes it as "moderately wide"? Of course you can use it on an APS-C body when it then acts moderately wide, but that is not its native use. I'm baffled as to what you see as "smarty-pants" about this fact.

Apparently the context of this topic is lost on you. I know perfectly well what the 20 was designed for. But that doesn't really matter when shooting aps-c apart from that it is still one of the widest primes you can get for Pentax aps-c.

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12-09-2017, 12:38 PM	#31
Lord Lucan Pentaxian Join Date: Sep 2017 Location: South Wales Photos: Gallery Posts: 2,977	Originally posted by D1N0 it is not very pragmatic to start talking about 35mm film. You smarty-pants remark only serves confusion. You started talking about a lens (Pentax-M 20mm F4) which was designed for 35mm film. In that, its original design function, it was an ultra-wide lens, and I can show you Pentax catalogues in which it is described as such; can you show me a Pentax catalogue which describes it as "moderately wide"? Of course you can use it on an APS-C body when it then acts moderately wide, but that is not its native use. I'm baffled as to what you see as "smarty-pants" about this fact.

12-10-2017, 12:57 AM	#32
D1N0 Pentaxian Join Date: May 2012 Location: --- Photos: Gallery Posts: 6,802	Originally posted by Lord Lucan You started talking about a lens (Pentax-M 20mm F4) which was designed for 35mm film. In that, its original design function, it was an ultra-wide lens, and I can show you Pentax catalogues in which it is described as such; can you show me a Pentax catalogue which describes it as "moderately wide"? Of course you can use it on an APS-C body when it then acts moderately wide, but that is not its native use. I'm baffled as to what you see as "smarty-pants" about this fact. Apparently the context of this topic is lost on you. I know perfectly well what the 20 was designed for. But that doesn't really matter when shooting aps-c apart from that it is still one of the widest primes you can get for Pentax aps-c.