I'm not going with any DOF tables. If you look at the photo that I referenced at the top of this thread, you will see that BOTH of the model's eyes are in crisp, sharp focus. So.. DOF or no DOF, it certainly IS possible. All I'm trying to do here is figure out why it's not happening for me.
Originally Posted by Marco Gilardetti
** My negs are "in focus", but not "tack sharp"
Originally Posted by Soeren
I'm using a Saunders VCCE XLG with a Schneider Componon-S 80mm lens. Should be more then adequate. I'm enlarging to about 8x10.
Are your enlarger, -lens and -technique good ?
Negative density varries from shoot to shoot, but this problem has persisted all throughout - this is years worth of negs we're talking about here.
Are your negs contrasty or soft, dense or thin ?
I own 2 PS-series lenses, same problem. As for another system, I plan on making a stop at B&H Photo and putting a roll through one of their demo floor-model Mamiya 645-AFD to see if there's a difference. Same with their Hassies.
It could be that the lens you own is a dog. Try another one out if you can. Maybe even another system.
I'll certainly look into that, thanks for the tip.
Read Barry Thornton's "Edge of Darkness". That man is a sharpness freak and although very basic there is a couple of good points in his Book.
Originally Posted by David A. Goldfarb
This certainly occured to me. But shooting at F/11 @ 1/250th I should be able to get pretty damn close to this. I'll try using a higher F-stop, but somehow I'm not convinced the problem isn't in the camera itself.
I consulted on this matter with Philip Cohen, a personal friend and a well known commercial photographer. He brought to my attention that the problem could very well be mirror slapping - apparently a known ailment of the Bronicas. Seeing as mine is an Sq-a, long discontinued, it is quite possible that the dampner has hardened and the shock is causing the lack of sharpness. I plan on doing a test later this afternoon, shooting newsprintg as well as a live model, comparing frames with and without pre-lock. I will post my results.
Originally Posted by df cardwell
That's a beautiful portrait, and though generally in focus, I don't know that I'd agree about the eyelashes being tack sharp as in the image referenced in my original post.
Rodinal's a great developer, and certainly enhances accutance. However, it can only work with the latent image that is already on the exposed film, and somehow I think mine are lacking in this regard. Where? How? that remains to be seen But I will continue updating this thread as progress is made. Time permitting of course.
The film to sharpness ratio has to do with the magnification of the image: how big is the detail you're trying to image relative to the granularity ?
Originally Posted by iserious
Tri X is perfectly capable of rendering eyelashes with great clarity ( normal lens, from 2 meters ) at a 4 to 5x enlargement.
TMY, a 7 to 8x enlargement.
But only if the light shows them clearly.
But you DON'T need an acutance developer to make sharp pictures.
Can you see the focus screen clearly ?
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I've shot a SQa for ten years and (I think) I don't have a problem. I shoot any film I can get my hands on, developed in what ever I have on hand (right now HC-110 and Rodinal with Diafine thrown in). My negs are acceptably sharp. I shoot the S series lenses, and by the way, PS does not stand for Pro Series, they are just the newer series of lenses.
Thoughts that come to my mind is whether your focusing screen is out of sync. What you see as in focus on the screen may not be what is getting to the film. Is the screen the original or replacement? Is it seated properly? Did the mirror get knocked out of alignment?
I'm not a professional or an expert but I'll put my Brony up against a Hassy anyday.
PS, I you're going to trash it, send me a PM. I have a nice trash can I can put it in.
What are you using to focus your enlarger? What are you using for a negative carrier? Do you use the waist level finder with a tripod and mirror up? Some tripods though otherwise very stable can show the results of harmonic virbrations if the shutter/mirror causes such vibrations that are incompatible with a given tripod. A Adams discussed this problem that he had between a very large Gitzo for 8x10 work and his Hasselblad which did not allow him to produce sharp results with this combination.
Last edited by Claire Senft; 04-21-2006 at 11:47 AM. Click to view previous post history.
Claire (Ms Anne Thrope is in the darkroom)
Does the SQa have mirror lock-up? That would confirm whether there is a mirror slap problem or not
Searching my way to perplexion
Perhaps it would help to diagnose your problem if you could post an image of yours that shows the problem you're having.
As with your contrast control issue with HP5+, I don't know where the source of your sharpness problem is coming from, as the Bronica system has had an excellent reputation for tack-sharp optics, and has been used quite successfully for many years by many working professionals.
Yes, is it a DOF issue? Is something in the shot "tack sharp" but not the rest, as much as you like? Or is it an overall softness, which would point to focus, optical, or steadiness issues in either the camera or enlarger? See if you can rule out DOF first.
Originally Posted by TheFlyingCamera
You could try shooting a high detail static subject with a wide lens at a smallish stop, and fast shutter, on a tripod, using mirror lock up, for big DOF with maximum steadiness, and examine the resulting print for overall sharpness. If its still mushy, you can probably rule out DOF.