Discussion Forum for various Lenses of different major labels in a shared environment at Photography In Malaysia

1. From : Robert Glenn Middleton (the_redd_groyne@hotmail.co.uk)
Url : http://
Date : 01:26 AM Friday 21 March, 2008

Jeremie,

The M39 designation is used for a screw mount for camera lenses. It is what some people call the old screw thread Leica mount, used on the rangefinder models prior to the release of the M mount models. Technically the 39mm diameter thread used on the pre M series Leicas, should not be designated M39 - This designation is for a thread with BOTH a metric diameter and METRIC pitch. The 39mm thread, as used by Leitz had an Imperial or INCH pitch - this anomaly arose because the RMS thread specifications were the norm at that time for optical instruments. RMS was an imperial or inch standard.

All Leica copies use the true M39 designation thread - except perhaps some very early FEDS, which were a direct copy of the Leica 1. In practise however, the difference in thread pitch does not stop Leica lenses fitting on the copies and Russian lenses fitting on the Leicas. Only in rare cases, when machining tolerances come into play, will you find trouble in mating a Leica Screw Mount item with a M39 mount item.

2. From : Jeremie L (private@nomail2spam.com)
Url : http://
Date : 04:00 PM Thursday 20 March, 2008

Brothers: I have always been reading some articles, quoting M39 mount but they are not Leica cameras (i do know leica has M mount and R munt), I have tried to find out but most answers are from forum. anyone here can shed some light on this ? is M39 refering to the size of the mount ?

3. From : Robert Glenn Middleton (the_redd_groyne@hotmail.co.uk)
Url : http://
Date : 10:15 AM Thursday 20 March, 2008

Lee,

You will not be able to find a replacement element for your zoom lens, your only choice is to look out for another lens. If the replacement lens has a more worn exterior, swap out the front element. I do not recall that this lens has any matched elements in the optics, therefore a straight swap should be OK.

As for the f1.2; it is possible to silver solder a new tab onto the actuator ring. You will have to strip down the rear assembly, but the repair is easy and functions well. The alternative is to purchase an optically damaged lens for spares. Any ring from a '1.4' rear assembly will fit. Note the '1.4' rear assembly is the one fitted to the more high spec lenses or telephotos. It has the actuator rings running on ball bearings - it called the '1.4' type because it first appeared on the nFD f1.4 50mm standard lens. So an optically damaged f1.4/50mm would supply the part needed.

4. From : Lee (zr1lee@netzero.net)
Url : http://
Date : 02:47 PM Wednesday 19 March, 2008

Unfortunately, my baby, Canon FD 85x300mm, fell out of it's hard case and shattered the outer large element. Does anybody know if someone can repair/replace the element?

I also have a Canon 50mm f1.2 with a broken aperture arm that is broke off-? (square tab on back of lens), any help in bringing these lenses back from the dead would be highly appreciated!

Thanks,
Lee
zr1lee@netzero.net

5. From : Steve Pisano (steve@stevepisano.com)
Url : http://
Date : 12:05 PM Tuesday 18 March, 2008

I have a
Nikon ED
AF-S Nikkor 80-200mm 1:2.8 D
I got it for $50.00 yes Fifty Dollars it works good it has a slight squeak in the motor when it focus. The plastic were the contacts has a crack in it on the inside but is not broke. (can that be replaced?)

I need a hood for the lens does anyone know what type and were can I get. I have read that the hood size is different for every lens. it is a 77mm.

Thanks for any info you can give.
Steve

6. From : rick oleson (rick_oleson@yahoo.com)
Url : http://rick_oleson.tripod.com
Date : 10:12 AM Sunday 16 March, 2008

Hi Jess:

To expand just a little on Glenn's explanation:

The 21/4 Nikkor was an early design that required the mirror to be locked up in order to fit the deep-set lens into the camera, as Glenn suggested. With the mirror locked up, the camera's viewfinder cannot be used so you will need an auxiliary finder. The 20/4 Nikkor was a later design. This is a retrofocus lens that is designed to fit in front of the mirror so that the standard viewfinder can be used.

7. From : Robert Glenn Middleton (the_redd_groyne@hotmail.co.uk)
Url : http://
Date : 02:43 AM Sunday 16 March, 2008

Jess,

I think you will find that the lens+auxiliary viewfinder combination are generally for rangefinder cameras and not slr cameras. Some older designs of wideangle lenses protrude too far into the mirror box on the slr, thus will only fit if the mirror is locked up. Extreme wideangle lenses are a problem when you are trying to design a built in viewfinder for a rangefinder body. The optical design for these does not sit well with the optics required for a 28mm to 135mm range of lenses. Certainly the 8mm and 15mm lenses that are available in Leica M and other mounts, just cannot be accommodated within the built in finder optics of a rangefinder camera. The slr is an entirely different kettle of fish, extreme wideangles can be designed so that the mirror function is not impeded. You can find the above mentioned older designs of extreme wideangles that will only fit on an slr if the mirror is locked up - in this case you would have to use an auxiliary finder. This is completely again the reasoning for the slr, hence the obsolescence of this type of design.

8. From : Jess (ask@yoursite.com)
Url : http://
Date : 01:50 PM Saturday 15 March, 2008

Can I ask why there are some lenses such as 21mm f4, 8mm f5.6 featured in your site says it needs a separate finder that attached to the "hotshoe"? I have a friend who has a 20mm f/4 (Nikon) which is 'wider" than 21mm and he doesn't need one. Is it because the aperture is different or something else that I am not aware of ?

9. From : F5er (prefer@private.com)
Url : http://
Date : 02:01 PM Wednesday 12 March, 2008

Yes and No (TC-16A - there were 2 models, one for older F3 and the other for normal Nikon to convert manual focus lens to autofocus). See http://www.mir.com.my/rb/photography/hardwares/classics/NikonF5/compatibility/index.htm thanks for the info, I didn't know that link (S/N). Looks like mine was a 2001 produce.

10. From : wong (jason_wongx1@hotmail.com)
Url : http://
Date : 01:49 PM Wednesday 12 March, 2008

Hello. Anyone here know the old AF Optical TELE_CONVERTER TC16A will work with the Nikon F5 ? p.s. thanks for the serial number page, I have found my new purchase was made in 1998. (http://www.mir.com.my/rb/photography/hardwares/classics/NikonF5/background/index1.htm#S/N). nice info !

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