[rollei_list] Re: Rollei Planars
- From: Ardeshir Mehta <ardeshir@xxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 26 May 2005 22:54:27 -0400
On 26-May-05, at 3:10 PM, Allen Zak wrote:
> Lenses vary among types and from one sample to another, but the
> Tessar and Xenotar should both give @ equivalent results at f 11.
> At smaller apertures, a comparison between them should demonstrate
> a little more contrast from the Tessar and of the Xenotar a bit
> more resolution. The Xenotar should be sharper at wider openings
> and also render a flatter field. Other differences I regard as of
> character, not quality. If they are great it could be anything from
> misalignment to subtle clouding of the Tessar lens elements (you
> would have noticed major gunk on the glass if it were that).
>
> Allen Zak
Thanks Allen.
My Tessar, while capable of giving decent enlargements of 20 x 20
inches, is DECIDEDLY less sharp than my Xenotar at that magnification
and larger. I see no visible defects on the Tessar's glass (indeed
it's the Xenotar which has visible cleaning marks on the front
element!) so I really can't figure out why.
Cheers.
+++++
> On May 26, 2005, at 12:40 PM, Ardeshir Mehta wrote:
>
>> On 26-May-05, at 1:53 AM, Peter K. wrote:
>>
>>> Because they are both good for different reasons. I agree here
>>> too. I prefer the 2.8 Planar as I like the wide open look of the
>>> Planar. And when stopped down it is very hard to better a Tessar.
>>
>> Ah.
>>
>> I wonder, then, why my Tessar-equipped Automat gives much less
>> sharp results than my Xenotar-equipped 2.8D, when both are stopped
>> down to about f/11. Do you think the lens might be out of whack?
>> (It doesn't APPEAR to be so). Maybe a Fleenorisation is called
>> for? What do you think?
>>
>>
>> Cheers.
>>
>> +++++
>>
>>
>>> On 5/25/05, Ardeshir Mehta <ardeshir@xxxxxxx> wrote:
>>>
>>>> On 25-May-05, at 7:13 PM, Eric Goldstein wrote:
>>>>
>>>>> I myself and partial to the 2.8 Planar and 3.5 Tessar.
>>>>>
>>>> May I ask why? (Just wondering.)
---
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