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Picture pentax F*300 4.5 disassembly
Pentax F*300 4.5 disassemblyThis disassembly can be seen/achieved in 3 parts
A- Front Objective Part
B- MID Part
C- last lens assembly part

the full set of pictures at

1)the objective part is seperated by reversing half of the rubber as shown in pic '1-c' to expose three holes (these are in the same axis), put the lens in manual mode, rotate as in to focus in manual mode, once one sees one screws, all three will be seen remove the screws. 2) Then unscrew the whole objective assembly to access the aperture assembly see 'pic 2' dis assembled. the front part of the picture is the front objective, keep it aside- this part disassembly will not be discussed.

now we have the mid part and last lens assembly part.
refer 'pic-3'
1) remove the screws
2) remove the bayonet -take care of the contact springs below

3) remove the aperture setting assembly- ring and the lever(refer 'pic-4' aperture ring and lever is in the background)
4)put it in a transperent poly bag remove the aperture ring dont loose the micro ball
5)unscrew the eyepiece assembly
6)remove the 2 screw which hold the electric contactspart remove the top part
7)remove the gear part (copper part) by uncrewing the two screws and removing the same
7)remove the 4 screws hold the shutter aperture lever and slowly remove the top part see 'pic-5' do not remove the two screws which hold the aperture lever before removing the top part
'pic 6' represents alignment part for reassembly
8) this will access the spring remove the spring refer 'pic 7 &7a' picture shown spring removed.

seperating the mid part and last lens assembly part
1)refer 'pic 8'- remove the three screw, then remove the copper ring (more than semicircle), reverse the aperture assembly will come out, else get it in f4.5 position/wide open and remove the aperture assembly.
2)note the trinangular part in 'pic-9'
3)'pic 9a' is the lower part of the aperture

pic-6 when one rotates the edge part reflects needs good quality lubricant- aviation grade with high tolerance to temperature
in pic-6 below the rubber grip remove the screws and the plates with screws and disassemble, be careful on the bearings
13 05-15-2014 08:04 PM
  tokina 19-35
0 None

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