Re: Flip side: Ex: Infinity Focus problem
Simon King wrote: Hi All, What about a 50mm lens that doesn't quite get to infinity? I just went out with Sam (http://wwwstaff.murdoch.edu.au/~sking/index.htm) and found that my f/2 50 paired with my Super Program doesn't focus at infinity. If you don't choose to do anything about it, that's okay, because at most reasonable apertures, you can set it at a hyperfocal distance to let the top end go to infinity, and not worry about it. Just have to remember to do it with that lens... keith wehaley - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Flip side: Ex: Infinity Focus problem
Simon, You may want to check to see if your other lenses are focusing to infinity with your camera to rule out mirror misalignment. Or put the lens on another body to check as well. If the mirror is misaligned on the body, you will have focusing inaccuracies; especially when you open up the lens (shallow depth of field). Regards, Jose R. Rodriguez From: Simon King [EMAIL PROTECTED] Date: 2002/08/14 Wed AM 05:11:12 CDT To: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Subject: Flip side: Ex: Infinity Focus problem Hi All, What about a 50mm lens that doesn't quite get to infinity? I just went out with Sam (http://wwwstaff.murdoch.edu.au/~sking/index.htm) and found that my f/2 50 paired with my Super Program doesn't focus at infinity. Cheers, Simon From: David Weiss Subject: Re: Infinity Focus problem Date: Tue, 13 Aug 2002 09:50:10 -0700 Rob, From what you said below, it seems that this problem does not really effect the ability of the lens to focus. I am going to take a few pics and see if it does. Thanks for the information. Dave Rob said: Given this information I expect that this particular lens has a problem. In some cases, through constant use, the infinity stop can become worn or the screws fixing the components can become loose HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
RE: Flip side: Ex: Infinity Focus problem
I just checked it with another lens (135mm) and the problem's there too :-( Is there any fix besides a CLA? Thanks Simon -Original Message- From: Jose R. Rodriguez [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 14 August 2002 9:54 PM To: [EMAIL PROTECTED] Subject: Re: Flip side: Ex: Infinity Focus problem Simon, You may want to check to see if your other lenses are focusing to infinity with your camera to rule out mirror misalignment. Or put the lens on another body to check as well. If the mirror is misaligned on the body, you will have focusing inaccuracies; especially when you open up the lens (shallow depth of field). Regards, Jose R. Rodriguez From: Simon King [EMAIL PROTECTED] Date: 2002/08/14 Wed AM 05:11:12 CDT To: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Subject: Flip side: Ex: Infinity Focus problem Hi All, What about a 50mm lens that doesn't quite get to infinity? I just went out with Sam (http://wwwstaff.murdoch.edu.au/~sking/index.htm) and found that my f/2 50 paired with my Super Program doesn't focus at infinity. Cheers, Simon From: David Weiss Subject: Re: Infinity Focus problem Date: Tue, 13 Aug 2002 09:50:10 -0700 Rob, From what you said below, it seems that this problem does not really effect the ability of the lens to focus. I am going to take a few pics and see if it does. Thanks for the information. Dave Rob said: Given this information I expect that this particular lens has a problem. In some cases, through constant use, the infinity stop can become worn or the screws fixing the components can become loose HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
RE: Flip side: Ex: Infinity Focus problem
Simon, If the camera has never been CLA'd or it has been a long time ( 5~7 yrs.) since the last one, then I recommend that you have the camera CLA'd. I highly recommend that you send it to a Pentax Authorized Repair Facility or one that has an experienced technician who is very familiar with Pentax Cameras. The CLA should include adjusting the mirror for accurate focusing. However, if the camera works perfectly otherwise (accurate shutter/meter, light seals in good shape, viewfinder clean and clear, etc...) then you may want to contact the repair facility and ask for a quote to have your misaligned mirror properly adjusted. My local repair technician charge me ~ $35 to align my MX's mirror, since it is not a complicated repair/adjustment... Regards, Jose R. Rodriguez [EMAIL PROTECTED] Pflugerville, TX -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Simon King Sent: Wednesday, August 14, 2002 7:17 PM To: '[EMAIL PROTECTED]' Subject: RE: Flip side: Ex: Infinity Focus problem I just checked it with another lens (135mm) and the problem's there too :-( Is there any fix besides a CLA? Thanks Simon -Original Message- From: Jose R. Rodriguez [mailto:[EMAIL PROTECTED]] Sent: Wednesday, 14 August 2002 9:54 PM To: [EMAIL PROTECTED] Subject: Re: Flip side: Ex: Infinity Focus problem Simon, You may want to check to see if your other lenses are focusing to infinity with your camera to rule out mirror misalignment. Or put the lens on another body to check as well. If the mirror is misaligned on the body, you will have focusing inaccuracies; especially when you open up the lens (shallow depth of field). Regards, Jose R. Rodriguez From: Simon King [EMAIL PROTECTED] Date: 2002/08/14 Wed AM 05:11:12 CDT To: '[EMAIL PROTECTED]' [EMAIL PROTECTED] Subject: Flip side: Ex: Infinity Focus problem Hi All, What about a 50mm lens that doesn't quite get to infinity? I just went out with Sam (http://wwwstaff.murdoch.edu.au/~sking/index.htm) and found that my f/2 50 paired with my Super Program doesn't focus at infinity. Cheers, Simon From: David Weiss Subject: Re: Infinity Focus problem Date: Tue, 13 Aug 2002 09:50:10 -0700 Rob, From what you said below, it seems that this problem does not really effect the ability of the lens to focus. I am going to take a few pics and see if it does. Thanks for the information. Dave Rob said: Given this information I expect that this particular lens has a problem. In some cases, through constant use, the infinity stop can become worn or the screws fixing the components can become loose HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Vs: Infinity Focus problem
Nah - don´t worry, it IS normal behaviour. Relatively, at least. You focus so that the image is sharp on the screen - period. There might be some wear in the focusing helicoid but start worry only when you cannot get proper focus or pictures are unsharp. All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho -Alkuperäinen viesti- Lähettäjä: David Weiss [EMAIL PROTECTED] Vastaanottaja: P. List [EMAIL PROTECTED] Päivä: 13. elokuuta 2002 1:54 Aihe: Re: Infinity Focus problem Date: Mon, 12 Aug 2002 21:29:44 +0200 From: Raimo Korhonen [EMAIL PROTECTED] Subject: Vs: Infinity Focus problem Raimo said: No problem - almost all lenses do that, especially longer lenses - focus beyond infinity, to take care of the different heat expansion characteristics of the glasses and barrel materials so that you get infinity focus whatever the temperature. All the best! Raimo Raimo and others, Let me relate why I ask this question. I was at a sports stadium this weekend, focused on a light tower with a 35mm lens, noticed that with the split screen, that it was not in focus unless I turned the focusing ring back a bit. Checked this with 2 other lenses (50 and 105mm), they focused on the light tower when focus ring was turned as far as it would go. From what others have said, since it is not AF lens or telephoto lens, than this is not normal behavior. Is it therefore indicative of a problem with focusing at all distances or just with infinity or? Surely others have had lenses that do this! Or am I just that unlucky? Don't lenses sometime go bad in this way through wear and tear? What would wear so that this might happen? Dave - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus Problem
Bob, The lens I am having the infinity focus problem with: focal length: 35mm I have to move the focusing ring back, so instead of being on the infinity mark, it is between infinity and the next mark, which happens to be 15 ft. Dave You didn't tell us which lens. You didn't tell us if the lens mark moves past infinity or if when the lens is at the end the mark is at infinity and you have to back it off. No proper answer can be given until you give us this information. Regards, Bob... 7EÔ - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus problem
Rob, From what you said below, it seems that this problem does not really effect the ability of the lens to focus. I am going to take a few pics and see if it does. Thanks for the information. Dave Rob said: Given this information I expect that this particular lens has a problem. In some cases, through constant use, the infinity stop can become worn or the screws fixing the components can become loose HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus Problem
The bad news: This is not normal behavior for a 35mm lens (or any short, non auto focus lens). The good news: Since you can actually focus to infinity, it doesn't matter. (I was afraid this might not be the case.) Regards, Bob... From: David Weiss [EMAIL PROTECTED] Bob, The lens I am having the infinity focus problem with: focal length: 35mm I have to move the focusing ring back, so instead of being on the infinity mark, it is between infinity and the next mark, which happens to be 15 ft. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Infinity Focus problem
Hi all, I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. Does anyone know what causes this? Does this indicate that the lens does not focus correctly through the whole range or that it is just off at infinity? Screwmount lens, btw. thanks Dave HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus problem
David, What is the focal length of the lens?? Some/most telephoto lenses (300mm or ) tend to focus beyond infinity to compensate for expansions and contractions from temperatures. Regards, Jose R. Rodriguez From: David Weiss [EMAIL PROTECTED] Date: 2002/08/12 Mon AM 09:25:10 CDT To: P. List [EMAIL PROTECTED] Subject: Infinity Focus problem Hi all, I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. Does anyone know what causes this? Does this indicate that the lens does not focus correctly through the whole range or that it is just off at infinity? Screwmount lens, btw. thanks Dave HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org . - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus problem
David wrote: I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. All long telephoto lenses and many auto focus lenses are designed to focus past the infinity setting. Most likely you have such a lens. Pål - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Infinity Focus problem
I think the word 'setting' should be emphasized, in your statement below. Why do you believe that to be true ~ to account for the lens construction material's expansion and contraction, as another on this thread has said? That the markings are only good at room temperature, and if you soak the lens at far different temperatures than that, there has to be some accommodation? Infinity is usually difficult to focus upon, so without AF, which I think doesn't focus on it either, in spite of arguments to the contrary, how do you tell what is right? I couldn't depend on a frenzel or split screen, frankly, to tell the difference between infinity and 100 feet! Except for focal lengths over 1000 inches or so, I don't think any rather normal lens could either... Ao, the question arises, why focus to 'beyond' the infinity setting? Do you suppose anyone can tell the difference between 100 feet and 1000 ft.? Or between 1000 ft. and infinity, on the film or the print? Do you suppose that an AF lens can, regardless of how it measures the distance between lens and subject? I suggest that maybe just setting the lens barrel on the infinity mark might be just fine, if that's what you want to take a picture of. Just some thoughts on the matter... Keith Whaley Pål Jensen wrote: David wrote: I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. All long telephoto lenses and many auto focus lenses are designed to focus past the infinity setting. Most likely you have such a lens. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Vs: Infinity Focus problem
No problem - almost all lenses do that, especially longer lenses - focus beyond infinity, to take care of the different heat expansion characteristics of the glasses and barrel materials so that you get infinity focus whatever the temperature. All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho -Alkuperäinen viesti- Lähettäjä: David Weiss [EMAIL PROTECTED] Vastaanottaja: P. List [EMAIL PROTECTED] Päivä: 12. elokuuta 2002 16:22 Aihe: Infinity Focus problem Hi all, I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. Does anyone know what causes this? Does this indicate that the lens does not focus correctly through the whole range or that it is just off at infinity? Screwmount lens, btw. thanks Dave HotJobs - Search Thousands of New Jobs http://www.hotjobs.com - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Re: Vs: Infinity Focus problem
Raimo Korhonen wrote: No problem - almost all lenses do that, especially longer lenses - focus beyond infinity, to take care of the different heat expansion characteristics of the glasses and barrel materials so that you get infinity focus whatever the temperature. Is that when the ring is rotated against it's stops? Or whenever it's placed exactly on the infinity mark? keith whaley All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho -Alkuperäinen viesti- Lähettäjä: David Weiss [EMAIL PROTECTED] Vastaanottaja: P. List [EMAIL PROTECTED] Päivä: 12. elokuuta 2002 16:22 Aihe: Infinity Focus problem Hi all, I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. Does anyone know what causes this? Does this indicate that the lens does not focus correctly through the whole range or that it is just off at infinity? Screwmount lens, btw. thanks Dave - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
Vs: Vs: Infinity Focus problem
When you focus the lens with split-image rangefinder or by AF the correct infinity setting may be past the engraved setting - or before it. The stop is not to be relied on absolutely but normally the depth-of-field takes care of small errors. And yes, it applies to all settings, not just infinity All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho -Alkuperäinen viesti- Lähettäjä: Keith Whaley [EMAIL PROTECTED] Vastaanottaja: [EMAIL PROTECTED] [EMAIL PROTECTED] Päivä: 12. elokuuta 2002 21:20 Aihe: Re: Vs: Infinity Focus problem Raimo Korhonen wrote: No problem - almost all lenses do that, especially longer lenses - focus beyond infinity, to take care of the different heat expansion characteristics of the glasses and barrel materials so that you get infinity focus whatever the temperature. Is that when the ring is rotated against it's stops? Or whenever it's placed exactly on the infinity mark? keith whaley All the best! Raimo Personal photography homepage at http://www.uusikaupunki.fi/~raikorho -Alkuperäinen viesti- Lähettäjä: David Weiss [EMAIL PROTECTED] Vastaanottaja: P. List [EMAIL PROTECTED] Päivä: 12. elokuuta 2002 16:22 Aihe: Infinity Focus problem Hi all, I have a lens that is little off when attempting to focus to infinity--instead of moving the focus all the way to the end, you have to back it off a little. It is only with this one lens and not a problem of the camera with other lenses. Does anyone know what causes this? Does this indicate that the lens does not focus correctly through the whole range or that it is just off at infinity? Screwmount lens, btw. thanks Dave - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
