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Forum: Pentax SLR Lens Discussion 04-02-2014, 12:05 AM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
In fact, I mentioned the device from blueprints above :)
Forum: Pentax K-5 09-10-2012, 01:07 PM  
K5: -/+ and ISO button question.
Posted By vizzy
Replies: 6
Views: 1,352
In fact, this was kind of surprise for me, when I borrowed K-7 for a week after my Samsung GX-20, it took me few days to get used to it.
Forum: Pentax K-5 09-09-2012, 09:23 PM  
K5: -/+ and ISO button question.
Posted By vizzy
Replies: 6
Views: 1,352
Yes, it was, both on K-7 and K-5, but you had to hold the button on previous models.
Forum: Pentax SLR Lens Discussion 09-04-2012, 01:28 PM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
Ethanol (was available), but I prefer isopropanol, it is much more efficient and convenient.
Forum: Welcomes and Introductions 09-04-2012, 12:58 PM  
Hello from Russia
Posted By vizzy
Replies: 1
Views: 407
Hello, my name is Vitaly Baranov. I was born and live in the town of Ivanovo, 200 miles from Moscow. I make my living working as an electronics design engineer, I design medical electronic equipment, mainly power electronic circuits.

I was fond of drawing and painting in the childhood and eventually took up photography in 2007, beginning with the father's Zenit SLR. Began using Pentax gear in 2008 and really like it since then for great design and value.

Here I am with my Mamiya RZ67, looking for a shot on a cloudy day.
Attachment 139641

You are welcome to visit my photostream on Flickr: Flickr: vitaly.baranov's Photostream
Forum: Pentax SLR Lens Discussion 09-04-2012, 12:36 PM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
I suppose, that you will need to unscrew three screws on the front of the lens assembly and take the front elements out, then you'll gain access to the aperture blades.
Forum: Pentax SLR Lens Discussion 09-04-2012, 12:10 PM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
Good sense of humour :) A little more offtopic. Here is the device from these blueprints and myself (left): Creators, part 1 | Flickr - Photo Sharing!
Forum: Pentax SLR Lens Discussion 09-04-2012, 11:35 AM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
7. Unscrew the screws shown by arrows (1). Be careful with the ball, that clicks aperture stops (2).
Attachment 139623

8. Unscrew the screw (1). After that you can take the lens assembly with the helicoid and electronics out of the external barrel. While doing this, the AF drive shaft (2) may fall out. Take care of the flex PCB with the contacts (see previous pictures).
Attachment 139624

9. So, the lens assembly is out. Remove the aperture lever (1). You'll need to detach the spring (2).
Attachment 139625

10. Very important notice: remove the contact brush (shown by arrow) before removing the focusing ring, otherwise you can bend or brake the contacts.
Attachment 139626

11. Take the decorative lens housing off (if you have not done it yet). Set the focus to the MFD, so that the moving lens housing is all the way out. There are three screws around this moving part (one of them shown with an arrow), unscrew them.
Attachment 139627

12. Unscrew three screws shown by arrows and remove the focusing ring.
Attachment 139628

13. Clean the contact tracks with solvent, just in case.
Attachment 139629

14. In order to take the lens assembly out of the helicoid, set the focus to MFD and unscrew four screws that hold the guiding parts. Pay attention to the place, where each of them belongs to, they are different.
Attachment 139630

15. After that you can take the lens assembly out. It is recommended to mark alignment of parts, otherwise you will need to assemble them by trial and error :)
Attachment 139631

And that's all. I didn't need to disassemble further, because cleaning and lubrication do not require this.

Assemble the lens in reverse order.
Forum: Pentax SLR Lens Discussion 09-04-2012, 10:49 AM  
FA50 disassembly and infinity focus adjustment
Posted By vizzy
Replies: 21
Views: 13,799
The same manual in Russian: ???????? FA50 - ?????? ?????-?????

Being unable to find a manual on the disassembly of these popular lenses, I had to find the method by trial and error. By the way, my experience can be useful for the community :) The lens described is the FA50/1.7, FA50/1.4 must be identical, or very similar.

Of course, you perform the actions described below on your own risk :)

It is recommended to have a set of quality screwdrivers.

0. Infinity focus adjustment. If you just want to adjust infinity focus (like me), you don't need to disassemble the lens! I found this out after disassembly, as always :)

0a. Set the focus to the MFD, so that the moving lens housing is all the way out. There are three screws around this moving part (one of them shown with an arrow), unscrew them.
Attachment 139609
Take the decorative lens housing off.

0b. Set the focus to infinity. There are three screws inside the focusing ring that are holding it,shown by arrows on the picture below. Loosen them. Be attentive: the screws in the deep, closer ones hold the front lens group, don't touch them!
Attachment 139610

0c. Hold one of the screws with tweezers or something similar and turn the inner ring counter clockwise. When the infinity focus is obtained (check on the camera), carefully set the outer focusing ring on the infinity mark (to the limit) and fasten the screws.

0d. Install the decorative lens housing back.

Lens disassembly.

1. Unscrew the five screws shown by arrows and remove the bayonet mount. Hold it while removing, because there are spring loaded contacts inside. In my case they did not actually jump out, but who knows...
Attachment 139611

2. Here are the contacts and springs, don't lose them.
Attachment 139612

Attachment 139613

3. Remove the aperture ring, A-position lock button will fall out of it.
Attachment 139614

4. Remove the round part that transfers the set aperture stop to the aperture blades and camera lever.
Attachment 139615

Attachment 139616

5. Remove the plastic contact group housing, it is held by one screw.
Attachment 139617

6. Remove the screws, shown by arrows.
Attachment 139618
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