vk2109 Posted March 28, 2012 Share #1  Posted March 28, 2012 Advertisement (gone after registration) Hi Guy  Just wanted to see for those using the above lens...do your eyes get tired faster with this lens ? I feel like it's way demanding more in terms of focusing than a 50lux at 1.4 ?  my vision is totally fine and I even use a slight diopter to increase the contrast...I don't know why but this lens not very appealing in terms of use compared to the 50lux/35cron;-)  Thanks  Vadim Link to post Share on other sites More sharing options...
Advertisement Posted March 28, 2012 Posted March 28, 2012 Hi vk2109, Take a look here Leica Elmarit M-90 User/owner. I'm sure you'll find what you were looking for!
jaapv Posted March 28, 2012 Share #2 Â Posted March 28, 2012 Umm-no... I find this one of the easier lenses to focus. Certainly not in the league of an Apo Summicron 90 asph for critical focussing. Did you check your diopter correction? Link to post Share on other sites More sharing options...
lct Posted March 28, 2012 Share #3 Â Posted March 28, 2012 A 90/2.8 is indeed more demanding that a 50/1.4 at full aperture but remains within the accuracy range of the rangefinder. It is not far from the latter's limit on the M8 though. Did you try a stronger correction lens or a magnifier? Link to post Share on other sites More sharing options...
jaapv Posted March 28, 2012 Share #4 Â Posted March 28, 2012 In terms of DOF yes, but the focus throw on this lens is close to ideal, making it an easy focuser. Link to post Share on other sites More sharing options...
vk2109 Posted March 28, 2012 Author Share #5 Â Posted March 28, 2012 I tried a magnifier and also diopter (even -3) while wearing contact lens...!!! maybe the lens need calibration ?!! Link to post Share on other sites More sharing options...
farnz Posted March 29, 2012 Share #6 Â Posted March 29, 2012 Using a magnifier is a double-edged sword: it makes the focus patch larger but it also reduces contrast. Â I've been using a Leica 1.25x on my M9-P continuously for a number of months because I've had my 90 APO-Summicron asph attached most of the time but I took it off a few days ago while using my 28 Summicron and I was amazed at the increased contrast in the viewfinder. So much so that I find it easier to focus the 90 AA without it and the magnifier will find a new home. Â Pete. Link to post Share on other sites More sharing options...
Double Negative Posted March 29, 2012 Share #7 Â Posted March 29, 2012 Advertisement (gone after registration) It's a sweet lens. Nice size, great IQ. The difference is you're looking at smaller framelines... Which might be straining your eyes. It doesn't bother me any though. Link to post Share on other sites More sharing options...
payasam Posted March 30, 2012 Share #8 Â Posted March 30, 2012 The size and location of the R/F patch do not change, never mind which lens is mounted. Oops. Which camera body is being spoken of? Link to post Share on other sites More sharing options...
Peter H Posted March 30, 2012 Share #9 Â Posted March 30, 2012 For no reason I can explain, I find the 90 E-M very easy to focus and I get a higher spot-on hit-rate with it at full aperture than I do with a 50 Summilux wide open, even though the 50 is my most-used lens. Link to post Share on other sites More sharing options...
Ralf Posted March 30, 2012 Share #10 Â Posted March 30, 2012 For no reason I can explain, I find the 90 E-M very easy to focus and I get a higher spot-on hit-rate with it at full aperture than I do with a 50 Summilux wide open, even though the 50 is my most-used lens. Â +1 Link to post Share on other sites More sharing options...
vk2109 Posted March 30, 2012 Author Share #11 Â Posted March 30, 2012 The size and location of the R/F patch do not change, never mind which lens is mounted.Oops. Which camera body is being spoken of? Â I use it on the M9 Link to post Share on other sites More sharing options...
vk2109 Posted March 30, 2012 Author Share #12 Â Posted March 30, 2012 +1 Â ....maybe i will give more try !! Link to post Share on other sites More sharing options...
payasam Posted March 31, 2012 Share #13 Â Posted March 31, 2012 The range-finder of an M Leica does not see through the lens that is mounted. It relies on a mechanical link between two optical systems. Thus no lens should be more or less difficult to focus than any other. Long lenses are more difficult to focus accurately, as are lenses of large aperture, because depth of field is so shallow that the smallest errors show up on the results. There is the question of "focus throw": longer and faster lenses usually have to be rotated more to get the same amount of movement of the R/F second image, which of course makes possible greater accuracy. A fact that is often neglected is that the user's eye is part of the optical system of the R/F and must be made to match the rest of the system. This is why diopters (and magnifiers) exist. Link to post Share on other sites More sharing options...
lct Posted March 31, 2012 Share #14 Â Posted March 31, 2012 The range-finder of an M Leica does not see through the lens that is mounted. It relies on a mechanical link between two optical systems. Thus no lens should be more or less difficult to focus than any other... There are always limits to rangefinders' accuracy. Lenses difficult to focus are generally those which exceed or approach these limits like fast telephotos typically. Link to post Share on other sites More sharing options...
payasam Posted March 31, 2012 Share #15 Â Posted March 31, 2012 I did not make this explicit, but it is what I meant when I spoke of focal length and maximum aperture. Link to post Share on other sites More sharing options...
IWC Doppel Posted March 31, 2012 Share #16 Â Posted March 31, 2012 On my M8 I think it's great but I do gave a habit of back focussing quite often, I have checked and it would seem to be me, not the lens. But a very smooth and straightforward action. Don't forget at f2.8 it's a shorter DOF than the 50 at 1.4 (from memory) closer to the Noctilux I think ! Link to post Share on other sites More sharing options...
lct Posted March 31, 2012 Share #17 Â Posted March 31, 2012 At full aperture, 90/2.8 is more demanding DoF wise than 50/1. Link to post Share on other sites More sharing options...
vk2109 Posted April 2, 2012 Author Share #18 Â Posted April 2, 2012 At full aperture, 90/2.8 is more demanding DoF wise than 50/1. Â I may be more demanding but feel the bokeh isn't as shallow as with the 50 1.4 at full aperture...and therefore weird that more demanding.. Link to post Share on other sites More sharing options...
lct Posted April 2, 2012 Share #19  Posted April 2, 2012 Depends on the value of the rangefinder's critical baselength. The higher this value the more demanding the lens is DoF wise. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/175876-leica-elmarit-m-90-userowner/?do=findComment&comment=1970630'>More sharing options...
vk2109 Posted April 2, 2012 Author Share #20  Posted April 2, 2012 Depends on the value of the rangefinder's critical baselength. The higher this value the more demanding the lens is DoF wise.  that's an interesting chart !! is there a way to get that with other lens...just curious  Thanks  Vadim Link to post Share on other sites More sharing options...
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