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Alt Lens FAQ

LightShow
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p.7 #1 · p.7 #1 · Alt Lens FAQ

Apr 28, 2017 at 06:53 AM

timballic
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p.7 #2 · p.7 #2 · Alt Lens FAQ

Thanks LightShow, I wish the link on pg 1 could be changed to that.

Apr 29, 2017 at 06:42 AM

jcolwell
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p.7 #3 · p.7 #3 · Alt Lens FAQ

timballic wrote:
Thanks LightShow, I wish the link on pg 1 could be changed to that.

I'll ask Fred if he can insert a new, second post for addendum, just before the first reply by @philber . This could be used to update expired links, and maybe provide a Table of Contents, with links to within the thread. I don't think it's realistic to expect Fred to maintain the TOC/Updates post (if it can be inserted), but there must be a way to allow edit-access to one or, preferably, a few members. I'd be happy to contribute some time to this. I'll send a PM to Fred about this, and report back if he has a chance to address it.

May 01, 2017 at 09:51 AM

LightShow
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p.7 #4 · p.7 #4 · Alt Lens FAQ

Good news, Stephen Westin has posted new links to his well used Mount Register list
https://www.dpreview.com/forums/thread/3935349, I've already thanked him in the thread.
And the new links below for convenience:
http://stephen-westin.com/misc/mounts-alphabetical.html
http://stephen-westin.com/misc/mounts-by-register.html

Jul 23, 2017 at 10:10 PM

wayne seltzer
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p.7 #5 · p.7 #5 · Alt Lens FAQ

Link to fast fifties shootout, Battle of the Fifties:

https://www.fredmiranda.com/forum/topic/996387

Aug 20, 2017 at 05:25 AM

chris9
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p.7 #6 · p.7 #6 · Alt Lens FAQ

deleted

Edited on Oct 05, 2017 at 04:15 AM · View previous versions

Oct 04, 2017 at 02:33 AM

chris9
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p.7 #7 · p.7 #7 · Alt Lens FAQ

moved

Oct 04, 2017 at 02:47 AM

LightShow
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p.7 #8 · p.7 #8 · Alt Lens FAQ

M39 is by far the most confusing mounts it has been used for everything, so you need to research this mount if you intend to buy a lens that has it to confirm its of the flavour you want.
M39 Enlarger lenses, they have no spicific register, the back focus is approximately its focal length.
M39 [45.2mm] aka Z39(Zenit) (Silver Helios 44, Industar 50 thin version) very close to M42 register(M42 = 45.46mm).
M39 [28.8mm] aka L39, aka LTM, aka L mount, aka LSM, (Leica, Canon, Voigtlander, etc... Industar 50 tall version) (M39x1 / 26tpi, depends on the origin).
M39 BelOMO Chaika-II (Industar 69)(Half frame) it has a unique register slightly less than LTM, and requires modification to reach infinity on LTM adapters. Search Industar 69 infinity mod if you buy one. http://vintagecameralab.com/belomo-chaika-ii-anniversary/
M39 Paxette

Which is which? Both are Industar 50's, left is Z39(SLR), right is LTM(Rangefinder)

http://forum.mflenses.com/industar-50-5cm-red-p-f3-5-leica-screw-l39-sony-nex-m39-t39927.html

Other than that, the bulk of lens mounts are relatively straight forward, with the mount swappable mounts being a bit more complex.

http://stephen-westin.com/misc/mounts-by-register.html (used to be hosted here: http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html ) I use it often.
https://en.wikipedia.org/wiki/Lens_mount (This one is quite good)
http://camera-wiki.org/wiki/Lens_mounts

May 02, 2018 at 11:37 AM

LightShow
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p.7 #9 · p.7 #9 · Alt Lens FAQ

Thought some may find this useful to post here.
Steve Spencer wrote:
Basically all modern macro lenses drop focal length when they go to 1:1. Here are some examples:

Canon 100 f/2.8L - drops to 75mm
Nikon 105 f/2.8 G VR - drops to 78.5mm (25% drop)
Sony 90 f/2.8 G - drops to 70mm (22% drop)
Leica R 100 f/2.8 APO - drops to 75mm with elpro 1:1 adapter (no drop at 1:2)
Voigtlander 125 f/2.5 APO - drops to 95mm (24% drop)
Voigtlander 110 f/2.5 APO - drops to 87.5 (20% drop)
Zeiss Milvus (or ZE/ZF) - drops to only 97mm at 1:2 (when lenses only go to 1:2 we tend to not see them drop...Show more →

Dec 18, 2018 at 02:34 AM

LightShow
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p.7 #10 · p.7 #10 · Alt Lens FAQ

Came across a nice graphic that illustrates angle of view. I just noticed that the AOV looks off for 35mm-28mm vs 50mm-40mm, and 40mm-35mm, each being 10deg different, 28mm seems way too close to 35mm.

It's source page is worth a look: https://www.casualphotophile.com/2019/04/02/zeiss-flektogon-lens-review/

A nice little summery of Zeiss: http://www.company7.com/zeiss/history.html

Sep 20, 2019 at 08:16 AM

Matt Grum
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p.7 #11 · p.7 #11 · Alt Lens FAQ

LightShow wrote:
28mm seems way too close to 35mm.

Yes that jumped straight out at me as being obviously wrong, even before I read your description!

Nov 03, 2020 at 06:32 AM

freewings2x2
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p.7 #12 · p.7 #12 · Alt Lens FAQ

Dec 19, 2021 at 01:00 AM

LightShow
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p.7 #13 · p.7 #13 · Alt Lens FAQ

timballic wrote:
Just tried the link on #1 post on the first page, comprehensive list of mount register distances here and it no longer works. Can it be reset, as it is so useful.
If that one on cornell.edu is no longer available, here's one on camera-wiki
http://camera-wiki.org/wiki/Lens_mounts
Here's the updated link: http://www.graphics.cornell.edu/~westin/misc/mounts-by-register.html Hmmm, they look identical, mine works and yours doesn't yet I don't see any difference. Clicking your link seems to take me there, but opening it in a new tab brings up an FM notice "The link you have opened does not appear to have originated from this site!"
So this seems to be a FM site issue.

And the author of that list provided a link to his own site: http://stephen-westin.com/misc/mounts-by-register.html
They are slightly different, I haven't looked to see what's different yet. (Samsung NX-M is in one but not the other, Exakta is another).

This one is also useful because it includes other dimensions. https://en.m.wikipedia.org/wiki/Flange_focal_distance
It's in the "Standard Mounts" section.

Feb 10, 2022 at 11:05 AM

prh5551
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p.7 #14 · p.7 #14 · Alt Lens FAQ

Hello,

I am thinking of buying a Leica SL2.
I own Zeiss Batis and Voigtlander lenses for Sony A74. Is it possible to adapt the E-mount system to Leica SL?

Thanks for a response.

Apr 18, 2023 at 07:48 AM

SrMi
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p.7 #15 · p.7 #15 · Alt Lens FAQ

Nov 12, 2023 at 06:55 PM

LBJ2
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p.7 #16 · p.7 #16 · Alt Lens FAQ

prh5551 wrote:
Hello,

I am thinking of buying a Leica SL2.
I own Zeiss Batis and Voigtlander lenses for Sony A74. Is it possible to adapt the E-mount system to Leica SL?

Thanks for a response.

As others have posted, no. You can however, adapt Voitgtlander M-mount lenses to the SL2 and there is a rather large selection of L-Mount lenses both AF and MF.

https://lesdeuxpiedsdehors.com/en/lenses-for-l-mount/

Dec 02, 2023 at 11:38 AM

coralnut
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p.7 #17 · p.7 #17 · Alt Lens FAQ

LightShow wrote:
Came across a nice graphic that illustrates angle of view. I just noticed that the AOV looks off for 35mm-28mm vs 50mm-40mm, and 40mm-35mm, each being 10deg different, 28mm seems way too close to 35mm.
I think that's an error in the diagram:

35mm = 65*
28mm = 75*
24mm = 83*

Obviously, if you look at the degree values, the field of view for 75* should be about midway between 65* and 83*, but the diagram doesn't show that. If the table is right then the diagram is wrong, and 28mm needs to be drawn wider.

Jan 16, 2024 at 08:49 PM

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