tag:blogger.com,1999:blog-1709537690528523236.post6708188215965294934..comments2024-03-15T06:59:20.114+10:00Comments on in my view ...: adapting a lens to fit the mountobakesanhttp://www.blogger.com/profile/13743339737847465926noreply@blogger.comBlogger26125tag:blogger.com,1999:blog-1709537690528523236.post-2695796376391661922012-04-11T23:58:11.348+10:002012-04-11T23:58:11.348+10:00Just saw this. I have a similar problem with the ...Just saw this. I have a similar problem with the Kern Switar 50mm f1.4 on the NEX-C count. It's just about 1 to 2 mm shy of getting to infinity, if I file the edge of the lens. But I can't bring myself to doing this to a beautiful lens.Lens Bubblehttps://www.blogger.com/profile/06445561503570800312noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-24457925673621151082011-09-30T22:15:02.049+10:002011-09-30T22:15:02.049+10:00Well, it took a while but I wanted to tell you it ...Well, it took a while but I wanted to tell you it worked. The adapter I bought that you had did not do the trick but I bought a Dremel (small drill-like machine) and shaved some more off the outer ring. After 2 tries I got it! So I wanted to say thanks for your patience and sound advice.<br /><br />Jeroen WolfJeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-46296608016202525472011-06-28T16:17:35.661+10:002011-06-28T16:17:35.661+10:00I guess its worth keeping in mind that not *EVERY*...I guess its worth keeping in mind that not *EVERY* C-mount can be adapted to work (and in particular not on every adpator). So before spending bucks on a lens best to check out its dimensions :-)obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-44809298857546989532011-06-28T16:10:32.277+10:002011-06-28T16:10:32.277+10:00Good and inspiring but alas, so-oo 0.5 mm away fro...Good and inspiring but alas, so-oo 0.5 mm away from what I need to do myself with my just-purchased Pentax 6mm TV c-mount lens on my GH2.<br />I really hope that many people have done this before me!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-26779858623686194612011-06-12T09:06:42.057+10:002011-06-12T09:06:42.057+10:00good luck with that, probably it'll fit withou...good luck with that, probably it'll fit without further adaptation :-)<br /><br />remember, grind the diameter of the rear barrel of the lens, not the length of the cyclinder.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-4892781393183794442011-06-12T02:00:04.324+10:002011-06-12T02:00:04.324+10:00Thanks again. I tried your piece of paper but I ca...Thanks again. I tried your piece of paper but I can't feel if it's a proper fit... <br />However I ordered an adapter like yours (your link doesn't work anymore but I found an identical adapter)<br />When I have it I will try again and start grinding if I don't get infinity. I'll keep you posted!<br /><br />JeroenJeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-2588440029969826802011-06-10T14:30:37.663+10:002011-06-10T14:30:37.663+10:00Hi Jeroen, this is an interesting experience in co...Hi Jeroen, this is an interesting experience in communication. Looking at your first picture I can see I was not clear enough. I meant the meerest tiddle bit of paper (think 2mm x 2mm) to just sit in there and as you tighten up the lens you will "feel" it if the two surfaces (the adapter and the lens back) touch. that way you <i>know</i> if it is screwing down to the right amount.<br /><br />I see from your other pictures that you are using the RJ Camera adaptor (as in my first image in this blog). This one will just cause heaps of hassle for you and you will not be able to be modify the adaptor without it becoming dangerously thin and risk braking.<br /><br />I have annotated your image here:<br />http://farm3.static.flickr.com/2656/5816791649_cd09aa52ff_b.jpg<br /><br />do demonstrate a couple of things.<br /><br />1) do not grind down the back part of the lens near the thread, that will cause you problems in getting infinity properly in focus. Instead you need to grind down the outsides of the cylinder to allow it to fit against the surface of the adaptor. <br /><br />2) you really need to think about the lens you have when picking an adaptor OR be willing to do heaps of modification.<br /><br />From what I hear the Pentax is a tough one to mount, but that it can be machined down (again, I stress on the outside of the cylinder not the base) to fit and there is quite some amount of brass which can be removed to have it fit.<br /><br />:-)obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-91765952856516364962011-06-10T01:07:43.057+10:002011-06-10T01:07:43.057+10:00I posted 6 more pictures that should give you all ...I posted 6 more pictures that should give you all the info you need.<br /><br />http://www.flickr.com/photos/40757923@N04/5814861721/in/photostream/<br /><br />thanks again,<br /><br />JeroenJeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-57764649229408924062011-06-09T19:43:43.596+10:002011-06-09T19:43:43.596+10:00I'm sorry, but that picture doesn't tell m...I'm sorry, but that picture doesn't tell me anything about how the adaptor and the lens are interacting, what you've ground off the lens and how.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-88453546387598397892011-06-09T19:31:46.842+10:002011-06-09T19:31:46.842+10:00Here's a link to the adapted lens+adapted adap...Here's a link to the adapted lens+adapted adapter. The inner ring of the adapter is not completely ground down but the surface of the rear barrel seems on par with the edge of the adapter...<br /><br />http://www.flickr.com/photos/40757923@N04/5703868932/in/photostream/<br /><br />But maybe I have to grond the adapter until the inner ring is completely gone! (that's why I asked: can the lens sink too deep?)<br /><br />thanks for your assistance!Jeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-38814972660598054712011-06-08T21:02:13.625+10:002011-06-08T21:02:13.625+10:00Joren ... do you know if the base of the lens is a...Joren ... do you know if the base of the lens is actually making it to touch the bottom of the adaptor? Need to be sure that the flat surfaces are meeting. Try a thin piece of paper and see if when you screw the lens on, that the sufraces are squeezing it together.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-30494306962563170232011-06-08T20:18:21.356+10:002011-06-08T20:18:21.356+10:00I don't understand. I had someone grind down t...I don't understand. I had someone grind down the rear barrel of my Pentax 6mm, grind some of the adapter when it wasn't enough and I still don't get infinity... drives me nuts. <br />I want to grind down more of the adapter but have a question before I do so: can the lens sink in too far? If I grind down another 2mm, could it be that that would be too much and affect the functionality of the lens?Jeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-54585959966537850252011-06-08T01:45:34.814+10:002011-06-08T01:45:34.814+10:00Very useful post! The newest Hawks adapter is quit...Very useful post! The newest Hawks adapter is quite a bit slimmer although my computar 12.5 f/1.3 still needs chamfering for infinity focus. Same with my Pentax 6mm f/1.2, although much more chamfering is needed since the lens does not step down like the computar.Shrigghttps://www.blogger.com/profile/11176617325552319664noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-28540571372343877472011-04-21T22:51:53.907+10:002011-04-21T22:51:53.907+10:00These are links to C-MOUNT 1/2 and 2/3 fast wide a...These are links to C-MOUNT 1/2 and 2/3 fast wide angle lenses that probably would fit GH2 and would fill the ETC 2.6x sensor area (some lenses needs modification in body or rear barrel):<br /><br />the rule to find the 35mm equivalent focal lenght is:<br />C-Mount focal lenght / 8.3 x 43,2 = full frame 35mm equivalent<br /><br />Observation: I do not know if some of them are fish eye<br /><br />Kowa 4-10mm<br />http://www.kowascope.com/frontend/proddetail.asp?pn=LMVZ41&co=10000343<br /><br />Kowa 3.5mm<br />http://www.kowascope.com/frontend/proddetail.asp?pn=LM4NCR&co=10000341<br /><br />Kowa 4.5mm<br />http://www.kowascope.com/frontend/proddetail.asp?pn=LM5NCR&co=10000341<br /><br />Kowa 6mm<br />http://www.kowascope.com/frontend/proddetail.asp?pn=LM6NCR&co=10000341<br /><br />Tokina 6-15mm<br />http://www.bhphotovideo.com/c/product/586064-REG/Tokina_TVR0614_TVR0614_1_2_C_Mount.html<br /><br />Pentax 4.2mm<br />http://www.bhphotovideo.com/c/product/340784-REG/Pentax_C60402KP_C60402_4_2_mm_f_1_6.html<br /><br />Pentax 4.8mm<br />http://www.bhphotovideo.com/c/product/609634-REG/Pentax_C30405KP_C30405KP_2_3_C_Mount.html<br /><br />Pentax 6mm<br />http://www.bhphotovideo.com/c/product/750911-REG/Pentax_C60636KP_1_2_C_Mount_6mm.html<br /><br />Pentax 6mm (other)<br />http://www.bhphotovideo.com/c/product/573470-REG/Pentax_C60607KP_C60607KP_1_2_C_Mount.html<br /><br />Fujinon 6mm<br />http://www.bhphotovideo.com/c/product/404242-REG/Fujinon_DF6HA1B_DF6HA_1B_6mm_F1_2_Fixed.html<br /><br />Fujinon 3.8-13mm<br />http://www.bhphotovideo.com/c/product/736855-REG/Fujinon_DV3_4X3_8SA_1_3_MP_Varifocal_Lens.html<br /><br />Tamron 4-12mm<br />http://www.bhphotovideo.com/c/product/414195-REG/Tamron_12VM412ASIR_12VM412ASIR_1_2_4_12_F_1_2.html<br /><br />Ikegami 4-12mm<br />http://www.bhphotovideo.com/c/product/560265-REG/Ikegami_IK_12VM412ASIR_IK_12VM412ASIR_1_2_C_Mount.html<br /><br />Arecont 4-10mm<br />http://www.bhphotovideo.com/c/product/737955-REG/Arecont_Vision_LENS4_10AI_Varifocal_Megapixel_Lens_4_10.htmlAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-77227922941598250772011-04-12T20:10:53.871+10:002011-04-12T20:10:53.871+10:00Thanks. I'll ask someone with the proper gear ...Thanks. I'll ask someone with the proper gear to keep damages to a minimum!Jeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-71295634529357474792011-04-12T19:07:35.067+10:002011-04-12T19:07:35.067+10:00Jeroen
I believe so ... although the bottom will ...Jeroen<br /><br />I believe so ... although the bottom will (like mine) look that wee bit ugly<br /><br />:-)obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-87746471055100832032011-04-12T17:49:44.999+10:002011-04-12T17:49:44.999+10:00Nice work! I have the Pentax 6mm 1.2 and have a C-...Nice work! I have the Pentax 6mm 1.2 and have a C-mount which seems to miss the second 'outer ring' on your lens. <br /><br />http://www.flickr.com/photos/40757923@N04/5610213396/<br /><br />The rear barrel is 1mm too wide to fit the adapter. Is it safe to just 'shave off' the metal on the barrel? (btw: any idea why don't they make adapters that fit these lenses?)Jeroen Wolfhttps://www.blogger.com/profile/06435448537547023350noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-7326319484164552912011-04-08T07:03:42.271+10:002011-04-08T07:03:42.271+10:00Hi
focus close is simply extending the lens furth...Hi<br /><br />focus close is simply extending the lens further from the mount. Often the markers for distance are (quoting from "Pirates of the Caribbean") more like a guide line. <br /><br />You can get closer focus by just unscrewing the lens a little on the mount (be careful it does not fall off, you will know where that point is) as both are just threads right?<br /><br />Also you can get small 'extension' rings which allow you to mount the lens further from the mount for very little on ebay ... they are just simply threaded tubes. I have an example of these for FD lenses on this page<br /><br />http://cjeastwd.blogspot.com/2009/11/why-i-love-my-g1.html<br /><br />the C-mount ones are much more compactobakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-84471037048050877462011-04-07T23:11:36.072+10:002011-04-07T23:11:36.072+10:00I have one that focuses to infinity but minimum fo...I have one that focuses to infinity but minimum focusing distance is about 3ft., nowhere near .4m indicated on the focusing ring. Have you adjusted this as well?Lens Wide-Open Photographyhttps://www.blogger.com/profile/17644092657183169438noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-12815438036767693092011-03-14T07:03:54.170+10:002011-03-14T07:03:54.170+10:00Hi
good point. I can confirm that it does screw d...Hi<br /><br />good point. I can confirm that it does screw down to meet the surface firmly.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-11385917405792051832011-03-14T05:27:54.675+10:002011-03-14T05:27:54.675+10:00Just thought i'd say that the "final chec...Just thought i'd say that the "final check" alignment mark on the lens is neither here nor there.<br />It doesn't have any particular position, seeing as its totally adjustable after loosening the 3 grub screws on the chrome collar and rotating the lens through 360 degrees... once the C-mount screw has seated home fully against the mount.<br />So unless you know the latter has been achieved, you cant take that mark to mean anything.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-77549390604876601172010-04-13T23:23:54.772+10:002010-04-13T23:23:54.772+10:00Thanks Obakesan, I got this lens and did the modif...Thanks Obakesan, I got this lens and did the modification. However I also removed the focus lock screw underneath the rubber focus ring. This gives more focus ring rotation to achieve perfect infinity + closer focus possibility. <br /><br />good work!<br />AntoineAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-15580551635535508462009-10-12T03:37:42.239+10:002009-10-12T03:37:42.239+10:00David
lens is working out ok ... vignetting and s...David<br /><br />lens is working out ok ... vignetting and samples can be found here:<br /><br />http://www.flickr.com/search/?q=c%20mount&w=63096645%40N00obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-88641326452931119042009-10-12T03:07:51.924+10:002009-10-12T03:07:51.924+10:00Wondering how this lens is working on your G1. I&#...Wondering how this lens is working on your G1. I'm considering a similar lens/adapter combo. Is there substantial vignetting? Is it fairly sharp?<br /><br />Thanks!<br />DavidPhototransformationshttps://www.blogger.com/profile/06276988643618191467noreply@blogger.comtag:blogger.com,1999:blog-1709537690528523236.post-61204597386500297832009-06-28T18:29:07.648+10:002009-06-28T18:29:07.648+10:00Hi there
sadly I don't have any experience wi...Hi there<br /><br />sadly I don't have any experience with those lenses. Please let me know if you do find out.obakesanhttps://www.blogger.com/profile/13743339737847465926noreply@blogger.com