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Heavystar Focus Tab Install for 40/2 Rokkor?
Old 12-19-2011   #1
Frank Petronio
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Heavystar Focus Tab Install for 40/2 Rokkor?

So I have the Heavystar tabs coming for a 40/2 Rokkor CLE... read that I need to unscrew the front element. Sorry to sound so flustered but what is the best way to do this? Any cautions, hints, etc?
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me too
Old 12-21-2011   #2
myM8yogi
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me too

I would love to do this too. Hope someone comes forward with some advice.

I have 40/2 CLE and much prefer the 35 'cron ASPH style focus tabs rather than the pressure finger grip thing on there right now. I have a spare tab but cannot seem to work out how to remove the old one. I have jeweller's scewdrivers and locksmith's files available, but otherwise no specialist tools.
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Old 01-11-2012   #3
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Question

Anyone????
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Old 01-11-2012   #4
sanmich
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Quote:
Originally Posted by Frank Version Two View Post
So I have the Heavystar tabs coming for a 40/2 Rokkor CLE... read that I need to unscrew the front element. Sorry to sound so flustered but what is the best way to do this? Any cautions, hints, etc?
Frank
Did you get the tab from Heavystar?
It has been a while since I last saw them listed on ebay...
thanks...
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Old 01-11-2012   #5
Frank Petronio
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I ended up going with a v.3 Cron and sold my Rokkor ;-p I consider their image quality similar but the Cron is a heavier build and has better resale value, not that it matters but it's nice to have the Leica lens if you can afford it....

I'm pretty crude, I thought the 35/2.5 VC was pretty much indistinguishable too, and it was new.
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Old 01-11-2012   #6
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I just saw this. Looks like too late.
I replaced a tab from a 50mm Elcan.
You don't unscrew it from the front, but remove a retaining ring from the back and the whole lens head comes off. Then you have access to the screw that holds the tab.
But often, every lens is slightly different. I really need to have it in my hands to see how to take it apart.

....Vick
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Old 02-06-2012   #7
filmfan
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I wonder if this would work on the 28mm M-Rokkor?
Anyone?
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Old 02-24-2012   #8
myM8yogi
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I just saw your response Vick - so I have to unscrew the scews on lens mount itself to get access to the small screw holding the focus tab?

I must admit, I thought it must work something like that because I could not see how else it would work.

Soooo, am I brave enough to try?

A lens disassembly diagram would help. Anyone seen such a thing for the 40/2?
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Old 02-24-2012   #9
myM8yogi
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Found it at the foot of this page:
http://www.jumboprawn.net/jesse/cams...cron-40mm.html

It actually looks like I use a spanner wrench to remove the brass ring ("retaining ring") around the lens elements. I don't need to touch the screws in the lens mount at all.
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Old 06-09-2012   #10
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Quote:
Originally Posted by filmfan View Post
I wonder if this would work on the 28mm M-Rokkor?
Anyone?
I would also like to know this.
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Old 03-08-2013   #11
myM8yogi
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I just stumbled over this old thread and thought I should update it...

About 8 months ago I pushed with regular but firm pressure on the old focus tab and found that it very (surprisingly) easily popped off the tiny screw holding it to the lens. So it turns out I didn't have to take the lens apart to make this modification after all. I then placed some Araldite (2-component epoxy glue) that I had premixed onto the lens screw and the new 35 cron ASPH thumb focus tab. I held the tiny screw down away from the lens barrell and applied the new focus tab. It has stayed in place ever since. There are no scratching noises or increases in friction that would indicate the screw projecting back into the lens barrell. The lens still works perfectly optically, but the handling has been transformed. I can now focus comfortably and quickly with a single finger.

I recommend this ergonomic upgrade to anyone not shy about modifying an old "user" lens. I had already filed down the mount to enable automatic selection of the 35mm frame lines on an M9.

What a fantastic beautiful little lens this is - my favourite normal lens by far!
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Old 03-08-2013   #12
lam
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Thanks for updating this thread, i'm going to be doing this immediately once my 40 Cron arrives.. any photos and or idea where you got the ASPH tab too? I have some Heavy Star V3 Cron tabs but am curious how a ASPH tab looks.
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Old 05-08-2013   #13
kaiwasoyokaze
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any pics? i would love to see how it looks and how it sits flush with the focusing ring.
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Old 05-08-2013   #14
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Quote:
Originally Posted by kaiwasoyokaze View Post
any pics? i would love to see how it looks and how it sits flush with the focusing ring.

Not the Rokkor but the 40mm Summicron:


http://doingphoto.wordpress.com/2012...-focusing-tab/

More on this thread

http://www.rangefinderforum.com/foru...d.php?t=103446
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Old 05-09-2013   #15
kaiwasoyokaze
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Thanks for the links, I especially love reading that off kilter English of the Russian site. Bookmarked for later!
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Old 05-25-2013   #16
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I have some coming in now and look forward to doing this mod!
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Old 07-06-2013   #17
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So i'm trying to remove the bezel at the rear of the lens to remove the optial unit to get at the screw for the tab.

I have tried to get it off using some tweezers, screwdrivers, but to no avail.

I gave up recently and bought a dedicated tool on ebay for removing these things (it's unofficial name is spanner wrench <that google image results totally disagree with>, but officially i couldn't find a name for these tools.)

Has anybody removed that rear part without using this dedicated tool? and if so, please give suggestions. It was really annoying.
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Old 07-07-2013   #18
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thanks for all the info guys, where can we get tabs?
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Old 07-07-2013   #19
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You can buy a workable spanner in the watch department at WalMart...

They sell it for opening watch cases to replace batteries.
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Old 07-09-2013   #20
kaiwasoyokaze
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ah...walmart would be a little hard to find at my location, but maybe at the local street market there might be something...
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Old 07-11-2013   #21
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Quote:
So i stripped the two indents on the nut surrounding the lens rear element.

I think i have been through every swear word in the english language.

This ####### thing will not unscrew from the rear so I can take the whole optical assembly out. I bought the proper tool from ebay, i have taped up the rear optical element so i wouldnt get these metal shavings on it.

is there any way i can get this off or to loosen it? has it been super glued on or something?!
i must have missed one more last curse word.


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