DA70 and 24x36 coverage

[J. C. O'Connell]

I disagree, the lenses that fully cover 24x36 should be marked so
so there is confusion if you are using both aps and ff bodies.
jco

-----Original Message-----
From: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net] On Behalf Of
P. J. Alling
Sent: Monday, October 01, 2007 6:52 PM
To: Pentax-Discuss Mail List
Subject: Re: DA70 and 24x36 coverage


No it's not bad. DA lenses are guaranteed to cover 16x24 but may cover a

larger format. That's the only guaranteed there is. It hurts nothing if 
they cover a larger format.

J. C. O'Connell wrote:
> If the comments below are true, it's bad. The lens designation should 
> convey if a lens wont cover 24x36mm IMHO. A APS-C only lens is not the

> same thing as a 24x36 lens and there should be an easy way to know by 
> the lens designation IMHO. jco
>
> -----Original Message-----
> From: pdml-bounces at pdml.net [mailto:pdml-bounces at pdml.net] On Behalf 
> Of Godfrey DiGiorgi
> Sent: Monday, October 01, 2007 3:37 PM
> To: Pentax-Discuss Mail List
> Subject: Re: DA70 and 24x36 coverage
>
>
> On Oct 1, 2007, at 11:46 AM, Boris Liberman wrote:
>   
>> I am asking my question mainly because if it indeed covered full 
>> frame
>>     
>
>   
>> and there were no image deterioration past the APC frame, Pentax
>> probably would have given it FDA designation instead of DA.
>>     
>
> The D-FA mount includes an aperture ring control. DA lenses do not.
>
> The DA70 has no aperture ring control, it was design for use with the
> digital SLR bodies. Whether it actually covers 24x36 mm format isn't  
> really relevant to the mount designation.
>
> Godfrey
>
> ---
> Not really relevant but interesting:
>
> In the course of researching my latest lens acquisition, I saw an
> article about someone who took an M42 mount Pentax Fish-Eye-Takumar  
> 17mm lens and cobbled up a mount to fit it on a 6x6 rollfilm folder  
> with behind-lens leaf shutter. His goal was to make circular fish eye

> images inexpensively ... it produced an image circle ~ 45mm in  
> diameter on the 6x6 format film, which suited his needs perfectly.
> ---
>
>
>
>
>   


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