If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Hello Folks,
Ok, so i've gotten back some 4x5 transparencies on Kodak 64T, using the Tominon 127mm lens. Comparing them to the other Schneider Xenar 135mm pictures i took of the same paintings, the tominon has much more even sharpness overall; none of the "rainbow" effect (thin blue line where the white canvas meets the black felt background) which plagues the edges of the Xenar. However, i could swear that the Xenar is actually a bit sharper in the center of the image! I used my 10x loupe to really look at the details. At first i thought it was because these latest pics were very slightly underexposed, but now i don't think so. It seems that the Xenar would actually be a very good lens when using it for 6x6, or 120 film, as this is using only the very sharp center of the lens. I really do like the Copal One type shutter that the tominon is mounted in, esp. the self-cocking feature! A MUCH nicer working shutter than my Synchro Compur-P. However, i would like to try the APO-Ronar, or another lens someone could recommend. I don't think the APO-Ronar fits into a Copal One though... is there another good copy lens that i could eBay that would fit the Copal one? My artwork Sizes range from 8.5"x11" to about 4'x3'. I usually end up about 0.8-1.8 meters away or so. If another lens isn't better, i could settle for the tominon. I would exchange a slightly less sharp center for better overall sharpness and no "rainbow" effect. Thanks for any feedback, Dr. Slick |
#2
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Dr. Slick wrote:
However, i could swear that the Xenar is actually a bit sharper in the center of the image! I used my 10x loupe to really look at the details. At first i thought it was because these latest pics were very slightly underexposed, but now i don't think so. It seems that the Xenar would actually be a very good lens when using it for 6x6, or 120 film, as this is using only the very sharp center of the lens. Try different f stops.. I'd say shoot a braket of f11 to f22 and compare. And yes you might find to get good corner sharpness you will give up a little center sharpness? Sometimes this center to corner sharpness can be adjusted by the lens spacing in the shutter. Just curious if you checked to make sure the cells are tightly screwed into the shutter? And I agree those self cocking shutters (with preview using another cable release) are great! -- Stacey |
#3
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Hi, Slick. Been reading up on lenses lately, or rather, reading up on
reading lens specs. The Xenar is optimized for long distance, meaning aberrations are corrected for infinity focus at the expense of close focus. This sounds rather consistent with the chromatic aberration you're describing. It doesn't mean the Xenar is necessarily a bad lens. You'll likely find the opposite to be true of the Tominon, but that's a pure guess on my part. (And it makes you wonder about all the pictures people have shot of their garage doors over the decades.) The lens you want is the APO Macro Sironar. The Apo Symmar is said to be optimized for 1:10 to infinity, the Super Symmar is optimized for infinity, and the Macro Symmar is unsurprisingly optimized for 1:1. That's just book larnin; I have no actual experience. Mike. "Dr. Slick" wrote in message om... Hello Folks, Ok, so i've gotten back some 4x5 transparencies on Kodak 64T, using the Tominon 127mm lens. Comparing them to the other Schneider Xenar 135mm pictures i took of the same paintings, the tominon has much more even sharpness overall; none of the "rainbow" effect (thin blue line where the white canvas meets the black felt background) which plagues the edges of the Xenar. However, i could swear that the Xenar is actually a bit sharper in the center of the image! I used my 10x loupe to really look at the details. At first i thought it was because these latest pics were very slightly underexposed, but now i don't think so. It seems that the Xenar would actually be a very good lens when using it for 6x6, or 120 film, as this is using only the very sharp center of the lens. I really do like the Copal One type shutter that the tominon is mounted in, esp. the self-cocking feature! A MUCH nicer working shutter than my Synchro Compur-P. However, i would like to try the APO-Ronar, or another lens someone could recommend. I don't think the APO-Ronar fits into a Copal One though... is there another good copy lens that i could eBay that would fit the Copal one? My artwork Sizes range from 8.5"x11" to about 4'x3'. I usually end up about 0.8-1.8 meters away or so. If another lens isn't better, i could settle for the tominon. I would exchange a slightly less sharp center for better overall sharpness and no "rainbow" effect. Thanks for any feedback, Dr. Slick |
#4
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
|
#5
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Stacey wrote in message ...
Try different f stops.. I'd say shoot a braket of f11 to f22 and compare. And yes you might find to get good corner sharpness you will give up a little center sharpness? Sometimes this center to corner sharpness can be adjusted by the lens spacing in the shutter. Just curious if you checked to make sure the cells are tightly screwed into the shutter? They are tightened as tight as you can with your fingers. Should be tight enough? And I agree those self cocking shutters (with preview using another cable release) are great! Yes, and the new cable release i got has made life a lot easier! Slick |
#6
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Dr Slick
Tominon 127mm Lens Preliminary Results My artwork Sizes range from 8.5"x11" to about 4'x3'. I usually end up about 0.8-1.8 meters away or so. Get a longer lens for the smaller work and keep yourself at 2 meters or longer. Weight your tripod with a one gallon water jug hung from the center of the tripod. Use copy lenses if you can find them. Most are f9. Bob AZ |
#7
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
Dr. Slick wrote:
Stacey wrote in message ... Try different f stops.. I'd say shoot a braket of f11 to f22 and compare. And yes you might find to get good corner sharpness you will give up a little center sharpness? Sometimes this center to corner sharpness can be adjusted by the lens spacing in the shutter. Just curious if you checked to make sure the cells are tightly screwed into the shutter? They are tightened as tight as you can with your fingers. Should be tight enough? Yep. -- Stacey |
#8
|
|||
|
|||
Tominon 127mm Lens Preliminary Results
On 2/4/2004 3:20 PM RWatson767 spake thus:
Dr Slick Tominon 127mm Lens Preliminary Results My artwork Sizes range from 8.5"x11" to about 4'x3'. I usually end up about 0.8-1.8 meters away or so. Get a longer lens for the smaller work and keep yourself at 2 meters or longer. Weight your tripod with a one gallon water jug hung from the center of the tripod. Use copy lenses if you can find them. Most are f9. The Tominon *is* a copy lens. -- It's fun to demonize the neo-cons and rejoice in their discomfiture, but don't make the mistake of thinking US foreign policy was set by Norman Podhoretz or William Kristol. They're the clowns capering about in front of the donkey and the elephant. The donkey says the UN should clean up after them, and the elephant now says the donkey may have a point. Somebody has come out with a dustpan and broom. - Alexander Cockburn, _CounterPunch_ (http://www.counterpunch.org), 9/17/03 |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
New Leica digital back info.... | Barney | 35mm Photo Equipment | 19 | June 30th 04 12:45 AM |
A question about lens hood | Mojtaba | 35mm Photo Equipment | 5 | June 22nd 04 03:00 PM |
Kodak Ektar 127mm lens | Msherck | Large Format Photography Equipment | 22 | March 29th 04 12:59 AM |
@@@ Sweet Spot Aperture for Tominon 127mm ?????????????? | Dr. Slick | Large Format Photography Equipment | 15 | February 8th 04 05:42 PM |
one unsharp corner on prints? Help! | Ed Margiewicz | In The Darkroom | 6 | February 4th 04 09:11 PM |