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[OM] Re: PTLens bug, was: lightroom vs lightzone vs olymaster vs olystud

Subject: [OM] Re: PTLens bug, was: lightroom vs lightzone vs olymaster vs olystudio vs ps vs capture 1
From: "Walters, Martin" <mwalters@xxxxxxxxxxx>
Date: Fri, 22 Feb 2008 16:34:13 -0500

 Chuck:
Don't have PTLens in front of me, so this may be a dumb question. How do
you know the issue is fixed? Is there an downloadable database? I know I
have been able to select the 24/2.8 and I think in conjunction with
"35mm SLR". Will have to check. Of course, maybe PTLens was doing
nothing....


Martin 

-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of Chuck Norcutt
Sent: Friday, February 22, 2008 4:24 PM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: PTLens bug, was: lightroom vs lightzone vs olymaster
vs olystudio vs ps vs capture 1

Wow!  That was fast.  The problems described below are already fixed. 
One was an error in the database.  I don't know what the other was. 
Anyhow you can now select the Zuiko 24/2.8 for any full frame SLR even
though you might not be able to actually mount it.

Chuck Norcutt

Chuck Norcutt wrote:
> But lens profiles are based on the film/sensor form factor.  
> Therefore, the data I supplied for the 24/2.8 is only usable on full 
> frame digital or 35mm film.  If you want to use a 24/2.8 on a 4/3 
> camera someone will have to submit a separate test.  Likewise, it 
> could not be used with a Canon small sensor DSLR.
> 
> I also discovered a bug in PTLens in that the 24/2.8 profile is not 
> accessible to you if you declare that you're using an Olympus 35mm 
> film image.  All that appears once you've chosen Olympus SLR is DZ 
> lenses even though you also say "35mm film".  But if you choose Canon 
> or Pentax SLR all the 35mm primes in the database are selectable.  The

> Olympus related bug also continues further in that, having once chosen

> Olympus SLR and 35mm film if you then go back and change the camera to

> Canon SLR PTLens will go catatonic with respect to distortion 
> correction and disable all distortion correction selections.  The only

> way out is to exit and restart.  But this latter half of the bug only 
> occurs on the standalone version and not on the PS plug-in.  As a 
> practical matter, however, you could tell it that the scanned OM film 
> image was really a Canon 5D image.  It wouldn't know the difference 
> and would allow access to the 24/2.8 profile.  Note that PTLens 
> requires you to disable camera and/or model # and/or lens type 
> detection in the EXIF if you're going to play games with these
paramaters.
> 
> I've reported the bug to the author but not heard back yet.
> 
> Chuck Norcutt
> 
> 
> C.H.Ling wrote:
>> Thanks! it is good to know PTLens support the old lenses, the 
>> vignetting and CA tools are also interesting, at $15 it seems a good 
>> investment.
>>
>> C.H.Ling
>>
>>
>> ----- Original Message ----- From: "Chuck Norcutt" 
>> <chucknorcutt@xxxxxxxxxxxxxxxx>
>>
>>> I just answered your question by submitting data for the OM mount 
>>> Tokina RMC 17/3.5 and Zuiko 24/2.8 with test data shot on a 5D.  The

>>> data was added to the PTLens database only yesterday.  I would go 
>>> shoot some more OM mount lenses if it wasn't so cold and snowy.
>>>
>>> PTLens advises to shoot test images from a distance of 20-50 feet 
>>> and that the data should be good for about 10 feet or further.  No 
>>> attempt is made for support of anything closer than that.
>>>
>>> Chuck Norcutt
>>>
>>> C.H.Ling wrote:
>>>> PTLens looks interesting but I see some problem for shots at 
>>>> different focus distance, like the Zuiko 18/3.5, it has very slight

>>>> pincushion distortion for distance object but high barrel 
>>>> distortion at close distance.
>>>> I wonder if PTLens will accept the OM Zuiko wides, since sooner or 
>>>> later I will get a 5D successor for my OM lenses ;-)
>>
>>
>> ==============================================
>> List usage info:     http://www.zuikoholic.com
>> List nannies:        olympusadmin@xxxxxxxxxx
>> ==============================================
>>
>>
>>
> 

==============================================
List usage info:     http://www.zuikoholic.com
List nannies:        olympusadmin@xxxxxxxxxx
==============================================
==============================================
List usage info:     http://www.zuikoholic.com
List nannies:        olympusadmin@xxxxxxxxxx
==============================================

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