|
Forum: Monthly Photo Contests
12-01-2011, 04:32 AM
|
| |
Exif datas:
Pentax *ist DL2
0,011 sec (1/90)
Aperture f/5,6
ISO 800
The lens is a manual focus one an old Sigma 70-210mm @210mm
|
|
Forum: Sold Items
07-23-2008, 12:51 AM
|
| |
I've sent you a pm on the SIGMA but I haven't received any reply...
Can you quote me a price shipped to Italy and Paypalled???
TNX
|
|
Forum: Sold Items
07-20-2008, 03:23 AM
|
| |
If you still searching a trade 18-55 (NEW and BOXED) for yours 135mm let me know!
|
|
Forum: Sold Items
07-10-2008, 03:33 AM
|
| |
| |
|
Forum: Sold Items
07-05-2008, 05:08 AM
|
| |
Would you quote me a price including shipping to Italy?
Kindest regards,
Domenico
|
|
Forum: Pentax SLR Lens Discussion
05-18-2008, 03:51 AM
|
| |
The cosinon is a manual lens as the Pentax M, works fine in stop-down. I just bought one (not tried yet) from a man who doesn't know that on its k100D he can go in stop down with this lens, so he give it away...
|
|
Forum: Pentax SLR Lens Discussion
05-18-2008, 01:20 AM
|
| |
Hallo,
You can use any M42 lenses on your k10 with an adapter. Please note that there are two types of adapter, a good version that permit infinity focus and a cheaper version that don't allow the full use of the lenses.
The cosinon is hard to admit but will give better performance on an aps-c camera then the Pentax will do.
Cosninon original list price:59£, Pentax original list price: 68£
If You give a look at the MTF curves of the M1.4 and of the Cosinon 1.4 You will find the following average behavoire for the two lenses:
50mm f/1.4 @ 10lpm
Cosinon 83% (maximum on centre @87% lowest on extreme border @77%)
Pentax75% (maximum on middle @78% lowest on full centre and extreme borders @72%)
50mm f/1.4 @ 20lpm
Cosinon 61% (maximum middle @65% lowest on extreme border @57%)
Pentax53% (maximum on middle @60% lowest on extreme borders @42%)
50mm f/1.4 @ 40lpm
Cosinon 30% (maximum on middle @33% lowest on extreme border @27%)
Pentax23% (maximum on centre @30% lowest on extreme borders @12%)
Average values for 50mm @2.8
10lpm
Cosinon 95% costant value
Pentax 93% (90 on borders)
20lpm
Cosinon 84% costant value
Pentax 75% (60% on borders)
40lpm
Cosinon 55% (40% on borders)
Pentax 43% (18% on borders)
Wish it helps...
The above values are valid only on APS-C Camera!!! Not on full frame
Regards,
Domenico
|
