Olympus-OM
[Top] [All Lists]

[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: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Fri, 22 Feb 2008 16:23:51 -0500
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
==============================================

<Prev in Thread] Current Thread [Next in Thread>
Sponsored by Tako
Impressum | Datenschutz