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Drop in filter holder and 3d printing

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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Topic: Drop in filter holder and 3d printing
    Posted: 03 February 2015 at 22:56
I've just received a Minolta 300mm f/4 lens and already have a Minolta 500mm f/8 reflex.

The subject of replacement drop in filters for these lenses , including such as the 300mm f/2.8 and 400mm f/4.5 , often come up .

While my lenses are complete I was wondering about using other filters in them.
The 300mm f/4 use a 42mm screw in filter , but after searching the net , they don't seem to exist .
I am considering having a firm such as SRB Gritturn make some 42mm filter rings for me and cut down some larger filters to size and mount myself.
I'd also like to set one up for a polarizer , but the holder would have had to been modified .


So my question is , given the increase in 3d printers , with domestic sized models becoming available , does any member here own one ?

If so would they consider making some blank mounts that filters could be inserted into , with or without a thread ?

If so , for how much ?

As I have the original , I can take all the relevant measurement's .




Updated to remove typo


Edited by neilt3 - 24 February 2015 at 20:21
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
 



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momech View Drop Down
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Post Options Post Options   Quote momech Quote  Post ReplyReply Direct Link To This Post Posted: 03 February 2015 at 23:14
Sony still uses 42mm drop in filters for their 300/2.8 and 500/4 lenses so you should be able to order from them.
I know that Sony does still make the 42mm CPol. It's not just the filter itself, but a housing and geared wheel assembly so that it can be rotated while inserted in the drop-in slot. It is somewhat expensive, although not as much as what you're talking about spending. I don't have the part #, but someone else should.
Not sure what other filters they may make in this size; maybe someone that owns one of these lenses can fill us in.
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Post Options Post Options   Quote revdocjim Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 01:23
Yup, I've checked with Sony and you can order either the drop-in filter holder, the filters or the CPL unit. But I think the 500/8 Reflex uses a different size.

Having said that, this stuff isn't cheap so you might be able to do better with a 3D printer. My 300/2.8 doesn't have the holder or any filters so I just cover up the hole with some white electrical tape.
Gallery A7S, A7Rii, Batis 18/2.8, 25/2 Sony 35/2.8, 55/1.8, 90/2.8M, 24-105/4, Minolta 135STF, 200/2.8 Blog
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 10:59
Originally posted by momech momech wrote:

Sony still uses 42mm drop in filters for their 300/2.8 and 500/4 lenses so you should be able to order from them.
I know that Sony does still make the 42mm CPol. It's not just the filter itself, but a housing and geared wheel assembly so that it can be rotated while inserted in the drop-in slot. It is somewhat expensive, although not as much as what you're talking about spending. I don't have the part #, but someone else should.
Not sure what other filters they may make in this size; maybe someone that owns one of these lenses can fill us in.

Hi thanks for the reply .
I know that sony still use the 42mm drop in filter holder but I wasn't sure if the holder in my 300mm f/4 was the same size / design as the f/2.8 lenses . Can anyone confirm that ?

Regards the polariser , likewise I have seen them and have been weighing up other options , Nikon and canon ones , but the bodies of the holders look too dis-similar to adapt.

Regards price , I wasn't considering buying either the original Sony CPol , or the actual 3d printer . Both of which are more than I would be prepared to spend .
That and the fact I probably couldn't switch the printer on , let alone do the programme to print anything !

Hence the question if anyone here has one so they could run a batch off and I could adapt them to do what I need.
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 11:09
Originally posted by revdocjim revdocjim wrote:

Yup, I've checked with Sony and you can order either the drop-in filter holder, the filters or the CPL unit. But I think the 500/8 Reflex uses a different size.

Having said that, this stuff isn't cheap so you might be able to do better with a 3D printer. My 300/2.8 doesn't have the holder or any filters so I just cover up the hole with some white electrical tape.


Hi Jim , after looking on Micheal Hohner's site I thought Sony didn't sell the filters on there own ?

The filter holder with the clear filter and the Cpol one , sure , at a price . But just the 42mm filter .
I know Minolta did , as they were originally for film camera , filters for black and white photography were supplied .
As Sony only do digital , apart from the Cpol , they don't appear to do separate filters.

Regarding the colour filters , I intend to use the lens with black and white film too , not just digital , and having a few 42mm filter's to carry around would be easier than the big front mounted filters .

A lot comes down to price though .

P.S , yes the 500mm reflex drop in filters are a different size ,(smaller) , luckily I have both for mine .
I only mention that lens , as if someone does have a 3d printer , a batch of them could be made , as that's another one that's always being asked for.   
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Bob J View Drop Down
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Post Options Post Options   Quote Bob J Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 11:31
I would imagine that some school/college design and technology departments might have invested in a 3D printer - you could always contact them and see if they would be interested to take it on as a project...
 



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SnowFella View Drop Down
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Post Options Post Options   Quote SnowFella Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 11:51
Doubt you are going to find many non commercial printers that can manage to print something as fine as a filter thread, let alone a scanner that can replicate the thread for printing.
Best bet would be a modified design that can house something like a metal step down ring to 42mm.
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Post Options Post Options   Quote revdocjim Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 13:07
I can confirm that the drop-in filters and holder are the same size for the 300/4, 300/2.8, 400/4.5 and 600/4.

And you may be right about the colored filters. I know you can get the clear one but I'm not sure about the others.
Gallery A7S, A7Rii, Batis 18/2.8, 25/2 Sony 35/2.8, 55/1.8, 90/2.8M, 24-105/4, Minolta 135STF, 200/2.8 Blog
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 04 February 2015 at 22:34
Thanks for the help/suggestions and information .

I shall have a think on this further .

I've ordered a 42mm - 39mm step down ring from China , to see if 39mm filters are usable .
I know some Nikon drop in filters use 39mm , so might be O.K .
On the 300mm f/4 the filter is next to the aperture blades , so as long as it doesn't act like a waterhouse stop , it might be a workable solution.

The polarizer might a problem......
A blank filter holder will do me , something to work with .

see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Post Options Post Options   Quote michelb Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2015 at 01:22
These filters (except the Polarizing) came as standard equipment with early versions of the 300 F2.8 and 600 F4 APO lenses.

Why not try a Want to Buy here at dyxum ? Some member who has one of these lenses may be willing to part with the filters.

They actually came in a nice leather case
Michel B
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Post Options Post Options   Quote ddd Quote  Post ReplyReply Direct Link To This Post Posted: 05 February 2015 at 10:41
First, the generic drop-in filter holder and the special CPol filter set from the "white ones" do fit into the 500 reflex and work without trouble.
Vice versa the two fixed drop-in filters from the 500 reflex have a smaller open diameter and you will get some vignetting using them with a "white one".

Minolta used to deliver a filter holder and a set of b&w filters (Normal/CLR, ND4x, 1B Skylight, Y52 yellow, O56 orange, R60 red) with the 300/2.8 and 600/4, but the later 400/4.5 and 300/4 where sold with a filter holder and CLR (and afaik a ND4x filter?) only. Two color correction filters (85/A12 dark orange and 80B/B12 blue) and the CPol filter set were separate sold items those days, and are rare.

Sony still use the same filter holder, but only manufacture the CLR filter and the CPol set. 300/2.8SSM and 500/4SSM are both sold with the filter holder, CLR and CPol filter set. These part are only available as spare parts and are very expensive:

Filter holder: A-1199-446-A (~ $130)
Normal (CLR) filter: 2-691-294-01 (~ $115)
CPol w/ holder: A-1199-756-A/B (~$720)
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Post Options Post Options   Quote pingu666 Quote  Post ReplyReply Direct Link To This Post Posted: 23 February 2015 at 03:43
https://www.3dhubs.com/ will make the op happy
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 24 February 2015 at 20:15
Originally posted by pingu666 pingu666 wrote:

https://www.3dhubs.com/ will make the op happy

Very happy , thanks for the link .
Turn's out their are loads of people quite local to me that do 3d printing .
I need to look into it a bit further , but as I do have the original parts , making a plan should be easy .
I just need to work out how to make a printable plan !
Link's are on the website .

As a side note , I have got some pieces of plastic together , a milling cutter ( although I don't have a milling machine , my pillar drill will be fine to cut plastic held in a vice ).
Glue , files , small hammer , big hammer etc !

Going to have a go at making the CPol out of bits first , but will also look at doing the plan for the 3d printer.

Thanks for the help and ideas.
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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polyglot View Drop Down
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Post Options Post Options   Quote polyglot Quote  Post ReplyReply Direct Link To This Post Posted: 24 February 2015 at 22:43
Access to 3D printers is easy, you'll probably find a hackerspace or three in Manchester that will give you use of a printer. There are also online services like shapeways and ponoko that will print an STL file for you, and they can typically print in very high quality using laser sintering instead of extrusion.

The hard part is the design. Personally I use OpenSCAD and that seems to be a common solution amongst the open-3D-print (i.e. reprap) world because of its openness, but it has a bit of a learning curve. See also thingiverse as a repository of designs; if you're willing to share a successful design then please release the source CAD files under an open-hardware license and place them on a big repository like thingiverse.

There are also free/online CAD tools but I don't trust them to continue existing in the long term. Make sure that whatever tool you use, you can export the source files in a recognised format, and not just the output (STL) files.

Have a good long look at the reprap forums; they have a lot of advice that will be useful to you even if you're not using a reprap to perform the print, e.g. where to look for design tools.
C&C always welcome
ex-Pic-A-Day
on flickr
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