Archived posting to the Leica Users Group, 2004/01/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Simon, From a mathematical standpoint it is a half a stop. However, B.D. is correct that from a transmission standpoint it is much closer to a 5.6. So, if using a handheld meter, consider it a 5.6 lens if you usually use a handheld meter and have calibrated all your other steps accordingly. On the other hand, if you are merely trying to find out just how slow this lens is, then do consider it a 6.8. In daylight conditions, the ergonomics of the Telyt package are very good for holding the lens still. This doesn't do much good if you are getting 1/30th for an ice skating event however. On another practical note, the faster telephoto's used up close have real issues with what is out of focus; composition is critical wide open which is why those who do use fast long glass successfully are truly talented individuals. In the Leica realm, I highly recommend the 400 Telyt as a first long lens as it is very light, amazingly sharp in any 8-12mm dimension on the film plane, and relatively inexpensive so not much is lost if telephoto's are not your cup of tea. One other reason to have a Telyt in your arsenal is that making one flare is next to impossible; as a cemented doublet the only flare is reflections off the flat black tube and any bright spots in the mirror box. Don dorysrus@mindspring.com - -----Original Message----- From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us] On Behalf Of animal Sent: Sunday, January 25, 2004 9:49 AM To: leica-users@mejac.palo-alto.ca.us Subject: [Leica] how much is a 6.8 opening? Is it half a stop between 5.6 and 8? Thanks simon jessurun - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html