[optimal] Re: Photographing techniques using a Zeiss 2x magnification lens
- From: JamesStrong <jamesdstrong@xxxxxxxxx>
- To: optimal@xxxxxxxxxxxxx
- Date: Sun, 10 Aug 2014 09:00:44 -0400
FWIW - changing settings on the camera body will have no affect on
focus/parfocality - it's an optics issues.
j-
On Sat, Aug 9, 2014 at 11:22 AM, Eric Kegley <ekegley@xxxxxxxxxxxxxxxxx>
wrote:
> Because the mag is higher, it is very important that your image is as
> sharp as possible trough the eyepiece. Also, you said something about the
> diopter compensation wheel being as plus as possible. You shouldn't have
> to change that unless your subject is very hyperopic. My advice would be to
> make sure your reticle is very well focused and then focus carefully on the
> center of the frame.
>
> Thanks,
> EK
>
> Eric Kegley, CRA, COA
> Director of Ophthalmic Imaging
> 6560 Fannin St., Suite 750
> Houston, TX 77030
> Main 713 524-3434
>
> Sent from my iPhone
>
> On Aug 9, 2014, at 9:31 AM, Marshall Tyler <marshalletyler@xxxxxxxxx>
> wrote:
>
> Are the eyepiece sharp at the same time as the image is sharp?
> Try a test target of a ruler or sm as 'll printed text which you tilt
> relative to the plane of focus. It should be sharp in the center. If sharp
> closer or further away you have a focusing problem. If is not sharp
> anywhere you may have a lens/system problem.
>
> Thank you,
> Marshall
> Marshall E Tyler
> On Aug 8, 2014 11:09 PM, <aissa9400@xxxxxxxxx> wrote:
>
>> Thanks Jeremy for the eye opener. I hope it's not a waste $ for the lens.
>>
>> I've changed the compensation lens to the highest plus mag on the FF4 and
>> turn the dial all the way. The image looked clearer but no cigar. I'm going
>> to try and change the setting on the 6D itself to macro, not sure what will
>> happen and if it will even let me change the setting while it's connected
>> to the PC.
>>
>> I would like more input on my thoughts if possible.
>>
>> Aissa
>>
>> A.D. sent by iPhone
>>
>>
>> On Aug 8, 2014, at 10:16 PM, Jeremy Pantell <jpantell@xxxxxxxxxxxxx>
>> wrote:
>>
>> HI AISSA! I guess the question is whether the Canon 6D/Zeiss 2X adapter
>> will "parfocal" with the Zeiss eyepiece. I would focus off your monitor
>> while trying to come up with a better solution. When using the 2X with a
>> film setup there was no particular magic about it. Just focus very
>> carefully and compose within the viewfinder grid. Good patients would
>> yield very nice results.
>>
>> sincerely, jeremy p. pantell bfa cra
>>
>>
>> On Friday, August 8, 2014 4:06 PM, Aissa Dirawatun <aissa9400@xxxxxxxxx>
>> wrote:
>>
>>
>> Hello everyone,
>>
>> Our practice purchased a Zeiss 2x lens adapter for our FF4 (w/ Canon 6D)
>> camera to use for ONH pictures. I'm having trouble focusing the image. I
>> need your advice.
>>
>> Thank you!
>>
>> Aissa Dirawatun, COA
>> Ophthalmic Photographer/Technician
>> Virginia Retina Center
>> 20 Rock Pointe Lane Suite 20
>> Warrenton, VA 20155
>>
>> --
>> *"Reading makes immigrants of us all. It takes us away from home, but
>> more important, it finds homes for us everywhere." ~ **Jean Rhys
>> 1890-1979*
>>
>>
>>
>>
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