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AUCTION SOON OVER
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PostPosted: Sat May 01, 2010 6:29 pm    Post subject: AUCTION SOON OVER Reply with quote
Anyone feeling adventurous and got a m4/3 with a D mount?

http://www.shopgoodwill.com/auctions/Yashinon-114-f13mm-No-81069486-Yashica-Lens-6129338.html

Forget the box (which isn't anything to do with the lens, but as usual they describe in detail.. as they never have a clue what they are selling)

Doug


PostPosted: Sat May 01, 2010 9:18 pm    Post subject: Reply with quote
This only covers 8mm - why would anyone want that if you need 21mm for m4/3 - hello??


PostPosted: Sun May 02, 2010 12:22 am    Post subject: Reply with quote
Aha! Sad
kds315* wrote:
This only covers 8mm - why would anyone want that if you need 21mm for m4/3 - hello??
Embarassed

Doug


PostPosted: Sun May 02, 2010 1:47 am    Post subject: Reply with quote
kds315* wrote:
This only covers 8mm - why would anyone want that if you need 21mm for m4/3 - hello??



Seems perfectly usable to me!


Some quick "back of the envelope" math:
Four Thirds sensor: 17.3 x 13 mm = 224.9 mm^2
Standard 8 film frame: 4.5 x 3.3 mm = 14.85 mm^2 = 6.6% of m4/3
Super 8 film frame : 5.79 x 4.01 mm = 23.22 mm^2 = 10.3% of m4/3

For the sensors, Panasonic has 12.1 or 12.11 megapixels, depending on the model, and Olympus has 12.3. Using 12.11 for our calculations, we get the following:
12.11 * 6.6% = 0.8 megapixels
12.11 * 10.3% = 1.25 megapixels

Now, in terms of pixel counts, these are comparable to the standard resolutions of 1024x768 and 1280x1024. While not enough for enlargements or medum/large prints, either of these is plenty of resolution for most web galleries.

The figures above also make the assumption that you crop to the original 8mm film frame sizes. But since the lenses will certainly cover a larger shape, if you can tolerate some vignetting in the corners you could enlarge your crop area a bit and gain quite a bit more resolution.... even to the point of using the whole image circle. There are likely some odd optical artifacts outside the center of the frame, but that's just part of the character of these old lenses.

Wink


PostPosted: Sun May 02, 2010 5:59 am    Post subject: Reply with quote
So maybe I was not as silly as was once supposed? Smile

Thanks

Doug

Scheimpflug wrote:
kds315* wrote:
This only covers 8mm - why would anyone want that if you need 21mm for m4/3 - hello??



Seems perfectly usable to me!


Some quick "back of the envelope" math:
Four Thirds sensor: 17.3 x 13 mm = 224.9 mm^2
Standard 8 film frame: 4.5 x 3.3 mm = 14.85 mm^2 = 6.6% of m4/3
Super 8 film frame : 5.79 x 4.01 mm = 23.22 mm^2 = 10.3% of m4/3

For the sensors, Panasonic has 12.1 or 12.11 megapixels, depending on the model, and Olympus has 12.3. Using 12.11 for our calculations, we get the following:
12.11 * 6.6% = 0.8 megapixels
12.11 * 10.3% = 1.25 megapixels

Now, in terms of pixel counts, these are comparable to the standard resolutions of 1024x768 and 1280x1024. While not enough for enlargements or medum/large prints, either of these is plenty of resolution for most web galleries.

The figures above also make the assumption that you crop to the original 8mm film frame sizes. But since the lenses will certainly cover a larger shape, if you can tolerate some vignetting in the corners you could enlarge your crop area a bit and gain quite a bit more resolution.... even to the point of using the whole image circle. There are likely some odd optical artifacts outside the center of the frame, but that's just part of the character of these old lenses.

Wink


PostPosted: Sun May 02, 2010 7:54 am    Post subject: Reply with quote
nemesis101 wrote:
So maybe I was not as silly as was once supposed? Smile


Not at this price point! I probably would have gone for it if they shipped internationally.


PostPosted: Sun May 02, 2010 8:01 am    Post subject: Reply with quote
I'm always happy to relay stuff for members.. Smile

Doug

PS At Goodwill they have has 11 C and D mount lenses recently - no idea why!


Scheimpflug wrote:
nemesis101 wrote:
So maybe I was not as silly as was once supposed? Smile


Not at this price point! I probably would have gone for it if they shipped internationally.
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