[LRFlex] Re: A blessing and a curse.
- From: Bob Palmieri <rpalmier@xxxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Tue, 5 Jul 2005 10:28:53 -0500
David -
Your post has reminded me that I don't remember whatever it was that I used to kindof know about depth-of-field (I even remember writing a paper on the subject in school in the '70's) - but my vague recollection is that it would be effectively the same no matter what other means you used to get the critter to be that size in the final form (including moving in closer without the converter or cropping.)
Somebody kindly remind me whass up with this issue... Or maybe I'll just pull out the books and straighten myself out. Or both.
Bob Palmieri
On Jul 5, 2005, at 10:11 AM, David Young wrote:
As most of you know, I'm having an absolute ball with Leica glass on a Canon 20D.
However, the 1.6 magnifcation factor is both a blessing and a curse.
As a wildlife enthusiast, I find the boost in the 400 Telyt + 2x converter to an effective 1280mm a huge asset. Not to mention a money saver - not having to buy a bigger lens! Another big plus is that this combination (at least, using the old SL 2x converter) suffered noticeable vignetting. It still does, but with the smaller, 17x23mm sensor, the vignetting does not apear in the final photo!
If you doubt this, compare:
http://www3.telus.net/~telyt/heron.htm to http://ww3.telus.net/~telyt/red-neck grebe.htm
The big problem with a 1280mm lens combo, is the incredible lack of Depth of Field.
Out at Tunkwa, the day before yesterday, I saw a marmot... and the marmot saw me.
See: http://www3.telus.net/~telyt and then click on Featured Photo.
This shot is sharp as a tack ... see his (her?) right (our left) eye. Yet the DOF is so small at such focal lengths, that the nose and teeth are fuzzy, to the point where the entire photo looks unsharp. And closing down does not seem to make any appreicable differrence, at least until you get to the point where you can't use the viewfinder, and it all becomes pointless.
Still, at high ISOs, the performance in all other respects, is remarkable.
Comments and criticism on the marmot (or any other shot) welcomed, as usual.
Thanks for looking.
David Young,
Logan Lake, BC
CANADA.
Personal Web-site at: http://www3.telus.net/~telyt
Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm
- References:
- [LRFlex] A blessing and a curse.
- From: David Young
Other related posts:
- » [LRFlex] A blessing and a curse.
- » [LRFlex] Re: A blessing and a curse.
However, the 1.6 magnifcation factor is both a blessing and a curse.
As a wildlife enthusiast, I find the boost in the 400 Telyt + 2x converter to an effective 1280mm a huge asset. Not to mention a money saver - not having to buy a bigger lens! Another big plus is that this combination (at least, using the old SL 2x converter) suffered noticeable vignetting. It still does, but with the smaller, 17x23mm sensor, the vignetting does not apear in the final photo!
If you doubt this, compare:
http://www3.telus.net/~telyt/heron.htm to http://ww3.telus.net/~telyt/red-neck grebe.htm
The big problem with a 1280mm lens combo, is the incredible lack of Depth of Field.
Out at Tunkwa, the day before yesterday, I saw a marmot... and the marmot saw me.
See: http://www3.telus.net/~telyt and then click on Featured Photo.
This shot is sharp as a tack ... see his (her?) right (our left) eye. Yet the DOF is so small at such focal lengths, that the nose and teeth are fuzzy, to the point where the entire photo looks unsharp. And closing down does not seem to make any appreicable differrence, at least until you get to the point where you can't use the viewfinder, and it all becomes pointless.
Still, at high ISOs, the performance in all other respects, is remarkable.
Comments and criticism on the marmot (or any other shot) welcomed, as usual.
Thanks for looking.
David Young,
Logan Lake, BC
CANADA.
Personal Web-site at: http://www3.telus.net/~telyt
Leica Reflex Forum web-page: http://www3.telus.net/~telyt/lrflex.htm
- [LRFlex] A blessing and a curse.
- From: David Young