[IMPOSSIBLE]Setting your lenses f-stops for greatest sharpness

Started by NickP, September 27, 2012, 12:56:00 AM

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NickP

This could be totally out there, I have no idea if this could be possible, but it's something I was thinking over yesterday.
My idea here would be to have a list of on the magic lantern interface of all lenses: Canon, Nikon, Sigma, Tokina, etc. and to pick which lens you are using at that moment in time. Once you pick your lens, magic lantern would set your f-stop for the aperture that would optimize the greatest sharpness (2.8, 5.6, etc.).

Please let me know if this is totally out there, or if it could be possible.

Roman

It doesnt sound like a technically complicated request, but a very tedious and time consuming one if someone would be expected to compile massive list of this information.

How is the greatest sharpness determined, regardless?

Is it a subjective opinion to some extent, or is it possible to be quantified?

Is there a list of all of this information available on the internet somewhere?

I'd certainly be interested just for sake of reference, what these apetures are for the lenses I've got if this information is floating around on the net somewhere, in an easy to read format.

nanomad

It's actually technically impossible because many non-canon lenses actually identfy themselves with a spoofed canon model ....
Moreover, if you own a lens you probably know its "sweet spot". Implementing such database would require a huge amount of work....
EOS 1100D | EOS 650 (No, I didn't forget the D) | Ye Olde Canon EF Lenses ('87): 50 f/1.8 - 28 f/2.8 - 70-210 f/4 | EF-S 18-55 f/3.5-5.6 | Metz 36 AF-5

NickP

Quote from: Roman on September 27, 2012, 01:20:27 AM
It doesnt sound like a technically complicated request, but a very tedious and time consuming one if someone would be expected to compile massive list of this information.

How is the greatest sharpness determined, regardless?

Is it a subjective opinion to some extent, or is it possible to be quantified?

Is there a list of all of this information available on the internet somewhere?

I'd certainly be interested just for sake of reference, what these apetures are for the lenses I've got if this information is floating around on the net somewhere, in an easy to read format.

Well unfortunately a lot of this information would be physically testing lenses. There is no list of this information online which is why I thought magic lantern might be the first to compile it. It would take a lot of time though and some people might disagree that one "sweet spot" is not correct.

NickP

Quote from: nanomad on September 27, 2012, 01:21:52 AM
It's actually technically impossible because many non-canon lenses actually identfy themselves with a spoofed canon model ....
Moreover, if you own a lens you probably know its "sweet spot". Implementing such database would require a huge amount of work....
This is very true. Totally understandable. It would take a TON of research. I just thought it'd be great for beginners. Thanks for considering though.

discocalculi

I usually try to keep the lens information in my head when I go out and take pictures. Usually the bag is not filled with all the lenses so it should be no problem to keep track of the numbers. Back in the day you read about f/8 everywhere as the sweet spot and nowadays most lenses seem to be performing best around f/5.6...

http://www.dxomark.com/index.php/en../Lenses/Camera-Lens-Ratings
http://www.lenstip.com/lenses_reviews.html
http://photozone.de/canon-eos
http://photozone.de/canon_eos_ff
http://www.the-digital-picture.com/Reviews/
http://www.dpreview.com/lensreviews/?category=lenses&order=date
http://slrlensreview.com/web/
http://www.juzaphoto.com/index2.php?l=en&pg=articoli



All sites have iso12233 charts, or similar which are handy to find out the facts about each lens.. There are also a lot of forums that can fill in the gaps which are left out in the various reviews... ML would probably become very bloated if everything was to be put in the memory or on the sd..

Some examples...

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=687&Camera=453&Sample=0&FLI=2&API=0&LensComp=108&CameraComp=453&SampleComp=0&FLIComp=0&APIComp=0

http://www.dpreview.com/lensreviews/canon_100_2p8_is_usm_c16/4

http://www.photozone.de/canon_eos_ff/485-canontse17f4ff?start=2

http://www.lenstip.com/344.4-Lens_review-Canon_EF_200_mm_f_2.0L_IS_USM_Image_resolution.html

http://www.dxomark.com/index.php/Lenses/Camera-Lens-Database/Sigma/85mm-F1.4-EX-DG-HSM-Canon/(camera)/436/(cameraname)/CANON-EOS-1Ds-Mark-III#div1anchor

http://slrlensreview.com/web/reviews/canon-lenses/canon-super-telephoto/56-canon-ef-400mm-f56l-usm-lens-review

http://www.juzaphoto.com/article.php?l=en&article=69

jpjgilchrist

Just throwing the idea out there, but would it be possible for ML to have a table where users could enter their lenses and the aperture they prefer for a limited number of lenses, say 5?  This would eliminate the burden of testing lenses and arguments over a particular sweet spot, and it would lessen the storage requirements.

a1ex

Then, what's the point of this? they could just dial that aperture.

gerk.raisen

[Aperture Range Mode]

Hello,

I think that a useful feature and more flexible than the proposal one is to have an option to manually set a range of aperture values (ex. f5.6 to f8) and the camera can only set a value between the two values.
The user can set these values according to the best for the lens in use or the type of photos (ex. boken)

It's possible to implement this?
P.S. I think can be useful also for some point-and-shoot when you don't have the time to manually dial between the proposal aperture values.

Thanks.

nanomad

Overriding auto mode decisions didn't go nicely when we tried it for ISO
And you can do that in P mode, let the camera set the exposure then use the wheel to select between the possible alternatives
EOS 1100D | EOS 650 (No, I didn't forget the D) | Ye Olde Canon EF Lenses ('87): 50 f/1.8 - 28 f/2.8 - 70-210 f/4 | EF-S 18-55 f/3.5-5.6 | Metz 36 AF-5

ilguercio

Canon EOS 6D, 60D, 50D.
Sigma 70-200 EX OS HSM, Sigma 70-200 Apo EX HSM, Samyang 14 2.8, Samyang 35 1.4, Samyang 85 1.4.
Proud supporter of Magic Lantern.

gerk.raisen

I think can be useful also for some point-and-shoot when you don't have the time to manually dial between the proposal aperture values.

ilguercio

Quote from: gerk.raisen on October 04, 2012, 02:38:56 PM
I think can be useful also for some point-and-shoot when you don't have the time to manually dial between the proposal aperture values.
???
How would you find the time to activate the option then?
Canon EOS 6D, 60D, 50D.
Sigma 70-200 EX OS HSM, Sigma 70-200 Apo EX HSM, Samyang 14 2.8, Samyang 35 1.4, Samyang 85 1.4.
Proud supporter of Magic Lantern.

discocalculi

I think the best way to deal with this option is to choose f/5.6 for most of the time, and keep your camera in AV or Manual mode setting (in manual mode, you could select auto iso and still tell the camera to keep a example 1/100 shutter and f/5.6 aperture. simple!)

I personally shoot a lot using TV mode (for mirror lenses and other longer lenses and when I want to make sure that my shutter is fast enough) or I choose AV mode (for landscape, every-day-situation snapshots, etc.) and at times M mode for those times when I have time to play around and want to have a bit more control.

All those stuff stays the same whether I am using Magic Lantern or not.