Site Sponsors
Results 1 to 3 of 3

Thread: Ricoh GW-3 wide angle converter on DP1m

  1. #1
    Member
    Join Date
    Jan 2011
    Posts
    35
    Post Thanks / Like

    Ricoh GW-3 wide angle converter on DP1m

    I've just bought a Gw-3 to try out on my DP1M - it was a bit opportunistic - London Camera Exchange had them for 95. I did wonder - with the Ricoh GR you have to use an adaptor which in effect is a spacer, whereas with the Sigma it screws directly into the filter thread. Is there any optical reason to experiment with filter spacers to increase that distance - I've found a 6mm spacer at SRB but they could be stacked of course. I'll try it as is, probably well stopped down but if results are not good, do you think adding spacers is a route worth going down? (PS, what I know about optical theory would have agrophobia on a pinhead)

    I'm not expecting miracles as it's less than 10% of the cost of the DP0 Quattro, but arguably 10x more portable.

  2. #2
    Member
    Join Date
    Jan 2011
    Posts
    35
    Post Thanks / Like

    Re: Ricoh GW-3 wide angle converter on DP1m

    Well no-one else interested so I'll start a conversation with myself. On the basis of a few handheld test shots in the fields round our village, actually better than Iad expected. Rather than being hopeless in the corners/edges, seems to be fairly even degradation of sharpness across frame. This is just onscreen at up to 100%; no idea how it will look in A4, A3 size printed.

    What I don't understand is the optical theory behind these converters; why does it focus at all, given its screwed directly into the lens filter thread whereas on the camera its designed for, the Ricoh GR, it has a big spacer.

  3. #3
    Senior Member
    Join Date
    Jun 2013
    Posts
    415
    Post Thanks / Like

    Re: Ricoh GW-3 wide angle converter on DP1m

    Quote Originally Posted by NigelC View Post
    ..What I don't understand is the optical theory behind these converters; why does it focus at all, given its screwed directly into the lens filter thread whereas on the camera its designed for, the Ricoh GR, it has a big spacer.
    Me too, so I couldnt answer, but I am interested.^^

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •