shogo Posted December 6, 2011 Share #1 Posted December 6, 2011 Advertisement (gone after registration) I just bought a used Summarit 35mm f2.5. My first Leica. At the max aperture (f2.5), I am still seeing the aperture blades through the lens at the edge of the barrel. Is this normal? All the lenses that I have owned do not have this. The aperture blades disappear and gives perfect circle defined by the lens barrel. BTW, it came with 2 certificates identifying the serial number corresponding to the lens I bought. One is the test certificate at the production stage. One is customer service certificate. Does this mean this lens was serviced by Leica? Thanks. Link to post Share on other sites More sharing options...
Advertisement Posted December 6, 2011 Posted December 6, 2011 Hi shogo, Take a look here Question: Summarit 35mm f2.5 Aperture Blades. I'm sure you'll find what you were looking for!
jaapv Posted December 6, 2011 Share #2 Posted December 6, 2011 Welcome 1. Yes that is perfectly normal with several lenses. See the regular threads we get on the subject 2. Yes that means it has been repaired by Leica Customer Service. A good thing. In general the gear leaves the Service in excellent condition and somewhat better adjusted than prodoction models. Link to post Share on other sites More sharing options...
luigi bertolotti Posted December 6, 2011 Share #3 Posted December 6, 2011 A bit of "closing" of the diaphragm at maximum aperture is normal on some lenses , both old and new: don't forget that, depending on the glass elements in front of it (typically, a group with convergence effect) it can be that this apparent small closing has no effect at all on the let'say "quantity" of incoming lightrays. Does the customer service certificate have a date ? I suppose it means a service, probably carried on during warranty... what I am sure of is that my Summarit 75, bought new, had only a quality assurance factory certificate. Link to post Share on other sites More sharing options...
01af Posted December 6, 2011 Share #4 Posted December 6, 2011 I just bought a used Summarit-M 35 mm 1:2.5. My first Leica. Good choice! It's an excellent lens with nice bokeh. Personally, I even prefer it over the Summicron-M 35 mm Asph. Its special strength is the far-better-than-average (almost perfect) resistance against reflexes and veiling glare in backlight situations. At the max aperture (f/2.5), I am still seeing the aperture blades through the lens at the edge of the barrel. Is this normal? Yes, it is. Don't ask me why ... but mine does the same. By the way, so does the Summarit-M 50 mm. <speculation>I suppose this design helps keeping vignetting down at full aperture. I guess when the aperture blades would disappear completely then the effective lens speed would be, say, 1:2.4 or 1:2.3—but only at the frame's center, not at the borders. However, I'm just speculating. I don't actually know why the aperture blades don't go out of the way entirely.</speculation> BTW, it came with two certificates identifying the serial number corresponding to the lens I bought. One is the test certificate at the production stage. One is customer service certificate. Does this mean this lens was serviced by Leica? I guess that's what it means. Link to post Share on other sites More sharing options...
Keith (M) Posted December 6, 2011 Share #5 Posted December 6, 2011 Presumably a feature of the Summarit range as the blades are visible in my 75mm too. Link to post Share on other sites More sharing options...
shogo Posted December 7, 2011 Author Share #6 Posted December 7, 2011 Welcome 1. Yes that is perfectly normal with several lenses. See the regular threads we get on the subject 2. Yes that means it has been repaired by Leica Customer Service. A good thing. In general the gear leaves the Service in excellent condition and somewhat better adjusted than prodoction models. Wow! Thank you guys. Very helpful information. I am new to Leica world, so I thought my question would be disregarded... I have been to other forums... But anyway. Thank you very much for the information. BTW, which one is considered the regular thread? Thanks. Link to post Share on other sites More sharing options...
Shade Posted December 7, 2011 Share #7 Posted December 7, 2011 Advertisement (gone after registration) Welcome 1. Yes that is perfectly normal with several lenses. See the regular threads we get on the subject 2. Yes that means it has been repaired by Leica Customer Service. A good thing. In general the gear leaves the Service in excellent condition and somewhat better adjusted than prodoction models. I would second what Jaap said. Link to post Share on other sites More sharing options...
andybarton Posted December 7, 2011 Share #8 Posted December 7, 2011 BTW, which one is considered the regular thread?. Jaap means that threads with similar questions come up regularly. Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.