newmoon2night
1-May-2010, 05:56
I'm thinking of buying a Nikon 90mm F/8, and have no way of trying this lens before I buy (and it will be imported, so postage is expensive).
When using a 110mm XL lens, I know I can view the edges perfectly acceptably wide open, and I've tested stopping it down, and viewing is perfectly acceptable at F/16, but getting difficult at F/22.
I also know that when using a 72mm XL, I have great difficulty viewing anything at the edges that isn't well lit, even when wide open at F/5.6.
At the edges the 110mm lens at F/22 seems clearer to me than the 72mm lens at F/5.6.
I'm not sure I understand this, as the centre filter for the 72mm is two stops, so I would have expected it to get equal at F/11. Is it to do with the image circle used by each lens?
I'm using a dark cloth, Maxwell bright fresnel, and 6x lupe, with no lens shift.
Has anyone any idea what F stop I should set the 110mm XL at to get an approximation of how the Nikon 90mm will look at F/8?
Thanks.
When using a 110mm XL lens, I know I can view the edges perfectly acceptably wide open, and I've tested stopping it down, and viewing is perfectly acceptable at F/16, but getting difficult at F/22.
I also know that when using a 72mm XL, I have great difficulty viewing anything at the edges that isn't well lit, even when wide open at F/5.6.
At the edges the 110mm lens at F/22 seems clearer to me than the 72mm lens at F/5.6.
I'm not sure I understand this, as the centre filter for the 72mm is two stops, so I would have expected it to get equal at F/11. Is it to do with the image circle used by each lens?
I'm using a dark cloth, Maxwell bright fresnel, and 6x lupe, with no lens shift.
Has anyone any idea what F stop I should set the 110mm XL at to get an approximation of how the Nikon 90mm will look at F/8?
Thanks.