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gi0rgi0ba
Joined: 16 Nov 2017
Posts: 37
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 Posted: Fri Apr 12, 2019 2:11 pm Post subject: |
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gi0rgi0ba wrote:
on http://oldlenses.blogspot.com/2012/05/canon-fl-58mm-f12-some-notes.html
someone said "you have to shave the focus heilicoil and on full frame the question is how much do you shave?
i do not think it is possible to achieve infinity focus with a full frame without having mirror collision.
my converted fl 58mm 1.2 will focus to about 16/20 feet.
i could shave more heilcoil, but how much more?
7mm sounds right, but what i need to know is how many mm past the ef mount will mirror collision happen?
a few tricks that are easy, 1, move the spacer washer that is placed for fl infinity focus."
7mm sounds strange for me if the difference in the Flange Focus Distance is about 2mm? and what is this spacer washer to be moved I do not understand.
_________________
lenses:
CZJ Biotar 58mm f/2 silver (M42),CZJ Biotar 58mm f/2 black (M40),CZJ Flektogon 20mm f/4 (M42),CZJ Flektogon 35mm f/2.4 (M42),
Staeble Kata 45mm f/2.8 (M39-Paxette), Staeble Choro 38mm f/3,5 (M39-Paxette),
Schneider-Kreuznach Xenar 50mm f/2.8 (M39-Paxette)
Asahi Pentax SMC Takumar 50mm f/1.4 (M42)
Asahi Pentax SMC Pentax-M 28mm f/2.8 |
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gi0rgi0ba
Joined: 16 Nov 2017
Posts: 37
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| Posted: Sat Apr 13, 2019 6:59 pm Post subject: |
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gi0rgi0ba wrote:
| Lightshow wrote: |
....
You can also manually confirm the back-focus/registration distance (project an image onto a wall)
Place a lamp 2-3m away from a wall, set the lens to 2-3m, get the lamp in focus, and measure to the wall from an easily measurable point on the lens, then figure out from that point where the mount flange is and subtract the difference. you should be close to 42mm.
Note: The FL/FD mount flange is buried in the lens mount. |
Hi Lightshow, I measured the Flange Focus distance as you suggested, is 42mm as expected.
I removed the front optics, this group has never been disassembled, i saw a unbroken seal (similar to that seen on the rear optics) between the retaining ring and the optics.
So the lens seem ok.
I think there is no room to move back the optics without drastically modify it.
_________________
lenses:
CZJ Biotar 58mm f/2 silver (M42),CZJ Biotar 58mm f/2 black (M40),CZJ Flektogon 20mm f/4 (M42),CZJ Flektogon 35mm f/2.4 (M42),
Staeble Kata 45mm f/2.8 (M39-Paxette), Staeble Choro 38mm f/3,5 (M39-Paxette),
Schneider-Kreuznach Xenar 50mm f/2.8 (M39-Paxette)
Asahi Pentax SMC Takumar 50mm f/1.4 (M42)
Asahi Pentax SMC Pentax-M 28mm f/2.8 |
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Patrick Harrington
Joined: 12 Nov 2023
Posts: 1
Location: Toronto
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| Posted: Sun Nov 12, 2023 12:44 am Post subject: |
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Patrick Harrington wrote:
Nice Work, Is there a link to where this EF mount can be purchased to convert The FL 58mm F1.2 I have?
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Life moves pretty fast, if you don't stop and look around once in a while, you could miss it. |
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55
Joined: 13 May 2013
Posts: 683
Location: U.S.
Expire: 2022-06-15
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| Posted: Mon Nov 13, 2023 7:03 pm Post subject: |
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55 wrote:
| Patrick Harrington wrote: |
| Nice Work, Is there a link to where this EF mount can be purchased to convert The FL 58mm F1.2 I have? |
Welcome.
It appears the topic starter hasn't been active here recently, but you could try asking him via private message or by the email address listed in his profile. |
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marcusBMG
Joined: 07 Dec 2012
Posts: 1290
Location: Conwy N Wales
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| Posted: Tue Nov 21, 2023 6:32 pm Post subject: |
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marcusBMG wrote:
TBH Patrick that looks like a diy job judging from the pics earlier in the thread.
The only people I know of who do a pro job FD to EOS are the Lens Doctor:
http://www.thelensdoctor.co.uk/page11.html
_________________
pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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