If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#10
|
|||
|
|||
convertible lens RF? Focal plane vs. leaf shutters in MF SLRs
yes, ditto my topcon 35mm SLR, with great lenses but a hard to maintain leaf shutter in body ;-( However, a very large number of 35mm rangefinders from the 1950s and 1960s had fixed lenses and leaf shutters, provided flash synch at any speed, but without danger of getting dirt or damaging shutter during lens changes (as just one fixed lens was used). a number of leaf shutter oriented MF SLRs feature an adapter which can be machined to take other non-leaf shutter lenses. In effect, this combination is a MF SLR body with a leaf shutter mounting into which you can adapt other lenses. A similar setup is used with microscopes and telescopes. I have described how to adapt an existing low cost leaf shutter lens by removing the glass etc., largely because the kowa shutter adapter is rare and costly and busted lenses are lots cheaper ;-) (see http://medfmt.8k.com/mf/kowafaq.html). the trend seems to be the other way in many cases. For example, the 4x5" and miniview graphic cameras usually used leaf shutters in the lenses, but then added models with focal plane shutters in the camera body which could be used instead of the leaf shutters with barrel lenses (i.e., lenses which do not come with leaf shutters for view camera use etc.). the hasselblad 200/x series provide focal plane shutters in the camera body, but allow you to use leaf shutters in the lenses as well. ===== Personally, I have wondered why nobody has created a MF RF with leaf shutter and convertible lenses, as with the old contaflex and kodak retina examples, see http://www.photo.net/bboard/q-and-a-...?msg_id=003HSZ I would think that with modern glasses and precision mounts, such a system could provide very good performance, while minimizing cost and weight. Instead of paying for 3 lenses, complete with three shutters and three lens mounts, you had one lens and three lens front elements. Swap these out, and you get a wide angle, normal, or telephoto lens effects. The cost for a three lens kit would be minimal over a similar 3 lens kit model which required three separate lenses, complete with three machined mounts and integral leaf shutters in each lens, yes? ;-) but I think the mfgers would rather sell us two additional lenses at full markup than provide us with a few extra front lens elements as part of the kit, yes? ;-) grins bobm -- ************************************************** ********************* * Robert Monaghan POB 752182 Southern Methodist Univ. Dallas Tx 75275 * ********************Standard Disclaimers Apply************************* |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Formula for pre-focusing | Steve Yeatts | Large Format Photography Equipment | 9 | June 22nd 04 02:55 AM |
zone system test with filter on lens? | Phil Lamerton | In The Darkroom | 35 | June 4th 04 02:40 AM |