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adrios
Joined: 20 Oct 2015
Posts: 5
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 Posted: Tue Oct 20, 2015 4:50 pm Post subject: is the Pentax 25mm f 1.4 I' m looking for? |
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adrios wrote:
Hi everyone!
I' m about to buy the famous Pentax/Cosmicar 25mm f 1.4 c-mount, but then i found that exist two version of it
one for 2/3" sensor, the other for 1"
I wish to buy the one that fits my m4/3 camera entirely, and for what I know is the 1" one, am I right?
I found a vendor who probabily has both the version, but then how I can discover which one is looking at them? (I already asked the vendor and he doesn't know)
they look like this:
one another like this:
and the last like this:
can somebody help me?
Last edited by adrios on Tue Oct 20, 2015 11:16 pm; edited 2 times in total |
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mo
Joined: 27 Aug 2009
Posts: 8982
Location: Australia
Expire: 2016-07-30
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| Posted: Tue Oct 20, 2015 10:52 pm Post subject: Re: is the Pentax 25mm f 1.4 I' m looking for? |
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mo wrote:
| adrios wrote: |
Hi everyone!
I' m about to buy the famous Pentax/Cosmicar 25mm f 1.4 c-mount, but then i found that exist two version of it
one for 2/3" sensor, the other for 1"
I wish to buy the one that fits my m4/3 camera entirely, and for what I know is the 1" one, am I right?
I found a vendor who probabily has both the version, but then how I can discover which one is looking at them? (I already asked the vendor and he doesn't know)
they look like this:
http://imgur.com/a/gOAn1
can somebody help me? |
Welcome to the forum,Sadly I don't know enough about C mount lenses,I am sure someone will help you eventually...you may want to browse this section of the forum until you get a reply.
Use the URL button to attach links not the code button,also your first post can not contain a link or image as its an anti spam measure.All should work now 
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Fuji XE-1,Pentax K-01,Panasonic G1,Panasonic G5,Pentax MX
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adrios
Joined: 20 Oct 2015
Posts: 5
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| Posted: Tue Oct 20, 2015 11:14 pm Post subject: Re: is the Pentax 25mm f 1.4 I' m looking for? |
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adrios wrote:
| mo wrote: |
| adrios wrote: |
Hi everyone!
I' m about to buy the famous Pentax/Cosmicar 25mm f 1.4 c-mount, but then i found that exist two version of it
one for 2/3" sensor, the other for 1"
I wish to buy the one that fits my m4/3 camera entirely, and for what I know is the 1" one, am I right?
I found a vendor who probabily has both the version, but then how I can discover which one is looking at them? (I already asked the vendor and he doesn't know)
they look like this:
http://imgur.com/a/gOAn1
can somebody help me? |
Welcome to the forum,Sadly I don't know enough about C mount lenses,I am sure someone will help you eventually...you may want to browse this section of the forum until you get a reply.
Use the URL button to attach links not the code button,also your first post can not contain a link or image as its an anti spam measure.All should work now |
thank you 
I went crazy trying to figure out why no images nor links was working, edited the post like 10 times :/ ended up using the code tag
I already did a search in section and found this:
http://forum.mflenses.com/pentax-c22525kp-25mm-f1-4-t47367,highlight,%2Bpentax+%2B25mm+%2Bf+%2B1+%2B4.html
that has been usefull thanks to this reply:
| std wrote: |
| The ones for 2/3" are not good - they are ok if you use 6:6 aspect ratio only. On normal 4:3 you see the image circle. |
but I still need to discover how the 1" version looks like |
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IAZA
Joined: 16 Apr 2010
Posts: 2587
Location: Indonesia
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| Posted: Wed Oct 21, 2015 1:44 am Post subject: |
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IAZA wrote:
I dont have experience with this lens.
I have Schneider xenoplan 35/1,9 for 2/3" it has appearance similar to this
no rubber grip. and judging the rear optic, it protude, maybe it has vignette on m4/3. I guess this one is for 2/3"
not sure absolutely though
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adrios
Joined: 20 Oct 2015
Posts: 5
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| Posted: Wed Oct 21, 2015 10:51 am Post subject: |
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adrios wrote:
| IAZA wrote: |
I dont have experience with this lens.
I have Schneider xenoplan 35/1,9 for 2/3" it has appearance similar to this
no rubber grip. and judging the rear optic, it protude, maybe it has vignette on m4/3. I guess this one is for 2/3"
not sure absolutely though |
mmmh, may it depends in the back of the lens?
for example, this:
looks smaller than this:
could be the difference between a 1" lens mount and a 2/3"? |
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kds315*
Joined: 12 Mar 2008
Posts: 16544
Location: Weinheim, Germany
Expire: 2021-03-09
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| Posted: Wed Oct 21, 2015 1:04 pm Post subject: |
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kds315* wrote:
Usually only for smaller video camera sensors
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"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
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IAZA
Joined: 16 Apr 2010
Posts: 2587
Location: Indonesia
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| Posted: Thu Oct 22, 2015 6:27 am Post subject: |
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IAZA wrote:
yes, smaller optic for smaller sensor. I'm sure of that theory, specially from same factory
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adrios
Joined: 20 Oct 2015
Posts: 5
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| Posted: Wed Oct 28, 2015 2:07 pm Post subject: |
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adrios wrote:
I still have no clue :/ |
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std
Joined: 09 Feb 2010
Posts: 1827
Location: Bulgaria
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| Posted: Wed Oct 28, 2015 2:15 pm Post subject: |
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std wrote:
it looks like the big one
i have the 2/3 version and it seems smaller in diameter
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Stefan
My lens list:
SLR MD: Rokkor 1,7/50 Exakta: Kilfitt-Makro-Kilar E 3.5/4cm; CZJ 2/50 Pancolar;M42: CZJ 2.8/50 Tessar; Mir-1B 2.8/37; Jupiter-9 2/85 T-mount: Tamron 5.9/200; Tamron 6.9/300; Tamron 7.5/400 C-mount: Cosmicar 1.8/50 Y/S: Sun 3.5/38-90, Sun 4/70-210 RF Contax RF: Jupiter-8 2/50; Contax G:CZ 2,8/21 Biogon T; CZ 2,8/28 Biogon T; CZ 2/35 Planar T; CZ 2/45 Planar T; CZ 2,8/90 Sonnar T |
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adrios
Joined: 20 Oct 2015
Posts: 5
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| Posted: Thu Oct 29, 2015 12:03 pm Post subject: |
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adrios wrote:
| std wrote: |
it looks like the big one
i have the 2/3 version and it seems smaller in diameter |
thank you for the answer!
do you mind sending some pictures of it? |
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std
Joined: 09 Feb 2010
Posts: 1827
Location: Bulgaria
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| Posted: Thu Oct 29, 2015 8:13 pm Post subject: |
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std wrote:
Just checked mine lens and it turned it is a Fuji for 2/3" not Pentax.
The outside diameter is around 29mm. Here it is next to Cosmicar 1.8/50 for size comparison.
Not the same lens but you can get the idea.
If i can choose i would get the bigger lens (first 2 pics)
#1
#2
#3
#4
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My lens list:
SLR MD: Rokkor 1,7/50 Exakta: Kilfitt-Makro-Kilar E 3.5/4cm; CZJ 2/50 Pancolar;M42: CZJ 2.8/50 Tessar; Mir-1B 2.8/37; Jupiter-9 2/85 T-mount: Tamron 5.9/200; Tamron 6.9/300; Tamron 7.5/400 C-mount: Cosmicar 1.8/50 Y/S: Sun 3.5/38-90, Sun 4/70-210 RF Contax RF: Jupiter-8 2/50; Contax G:CZ 2,8/21 Biogon T; CZ 2,8/28 Biogon T; CZ 2/35 Planar T; CZ 2/45 Planar T; CZ 2,8/90 Sonnar T |
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