K-1 and analog lenses - help!

Photogoof · 11-13-2022, 09:50 AM

I had the focus on infinity. I don't have my photos on any sites such as Flickr, so I can't post a link.

pschlute · 11-13-2022, 05:43 PM

Originally posted by Photogoof

I had the focus on infinity.

Most modern lenses can be focussed beyond infinity. The reason they are made this way is to allow for expansion due to heat.

if you turn the focus ring to the maximum you are focussing beyond infinity and will get a poor image.

**gaweidert** · 11-16-2022, 11:13 AM

Originally posted by pschlute

Most modern lenses can be focussed beyond infinity. The reason they are made this way is to allow for expansion due to heat.

if you turn the focus ring to the maximum you are focussing beyond infinity and will get a poor image.

They also went past infinity to properly focus past infinity. I have an old lens or two that actually marks the IR infinity point.

**mikesbike** · 11-20-2022, 01:32 PM

To test for infinity focus, it is not best to do so with your frame filled with subject matter located a lot closer than the horizon. Manually focusing to infinity for a scene like this would more likely put most of it out of focus. To test for accurate focus other than infinity, it is best to set AF to center-only spot AF and find one particular object having clear-cut edges and well defined detail to focus on. A tree with a bunch of leaves allows the focus point to be hard to recognize, being trained about anywhere within the scope of the shot!

One of your old prime (non-zoom) lenses might have a distance scale by the aperture ring which will allow you to maximize your depth of field (DOF) for a particular lens when shooting from a particular spot.

Last edited by mikesbike; 11-20-2022 at 01:38 PM.

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11-13-2022, 09:50 AM	#16
Photogoof Pentaxian Join Date: Jan 2008 Location: Prague Photos: Gallery Posts: 6,422 Original Poster	I had the focus on infinity. I don't have my photos on any sites such as Flickr, so I can't post a link.

11-13-2022, 05:43 PM	#17
pschlute Moderator Loyal Site Supporter Join Date: Mar 2007 Location: Surrey, UK Photos: Gallery Posts: 8,211	Originally posted by Photogoof I had the focus on infinity. Most modern lenses can be focussed beyond infinity. The reason they are made this way is to allow for expansion due to heat. if you turn the focus ring to the maximum you are focussing beyond infinity and will get a poor image.

11-16-2022, 11:13 AM	#18
gaweidert Loyal Site Supporter Join Date: Mar 2012 Location: Rochester, NY Photos: Gallery Posts: 5,325	Originally posted by pschlute Most modern lenses can be focussed beyond infinity. The reason they are made this way is to allow for expansion due to heat. if you turn the focus ring to the maximum you are focussing beyond infinity and will get a poor image. They also went past infinity to properly focus past infinity. I have an old lens or two that actually marks the IR infinity point.

11-20-2022, 01:32 PM	#19
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,558	To test for infinity focus, it is not best to do so with your frame filled with subject matter located a lot closer than the horizon. Manually focusing to infinity for a scene like this would more likely put most of it out of focus. To test for accurate focus other than infinity, it is best to set AF to center-only spot AF and find one particular object having clear-cut edges and well defined detail to focus on. A tree with a bunch of leaves allows the focus point to be hard to recognize, being trained about anywhere within the scope of the shot! One of your old prime (non-zoom) lenses might have a distance scale by the aperture ring which will allow you to maximize your depth of field (DOF) for a particular lens when shooting from a particular spot. Last edited by mikesbike; 11-20-2022 at 01:38 PM.