Rokkor or Elmar 90mm lens filter question

<p>In looking at various 90mm lenses to buy for my new (for me) M6, I am seriously looking at an f/4 Elmar or Rokkor, but am concerned at their 40.5mm filter size. This seems like a pretty unusual size. That means I would have to buy duplicate filters of the 39mm filters I already have or intend to purchase. Correct? From what I read, the 90mm tele-elmarit has 39mm filter threads. If that is correct and it takes the same size filters, that might be the way to go. Any thoughts?<br>

Chuck</p>

<p>Thin tele elmarits are plagued with lens separation in rear elements. No economical repair.<br>

Mine is fine since new in 1985, but many have had problems.</p>

<p>90 4.0 Macro Elmar is current collapsible and a first class lens in all respects. I would not give min up.<br>

90 3.5 Cosina Voitlander APO. First rate lens. CameraQuest.com </p>

<p>Places like <a href="http://www.camerafilters.com/pages/colored.aspx">CameraFilters</a> and others offer a lot of 40.5mm screw-in filters. It's an older size, but they are small and not usually too expensive.</p>

<p>40.5mm filters aren't that hard to find at all, including new. The oddball size is 40mm, used almost exclusively by Canon on their RF lenses.</p>

 

<p>A someone has already mention 40.5mm filters are readily available but I can certainly appreciate the desire to standardize with 39mm. The 2 Rokkor 90's take 40.5 but the Elmar-C takes the even more oddball series 5.5. However, although not perfect it is 39mm with a different pitch. This means that a 39mm filter can screw in a couple of threads and hold the filter quite firm. If you dont force it on hard its a method that I have often used in this instance.</p>

<p>What about an Elmar or Elmarit 90mm (my recommendation) early version?! You could buy them for a song and they both have 39mm filter thread.<br>

Great for portraits, both!</p><div></div>

<blockquote>

<p>Thin tele elmarits are plagued with lens separation in rear elements.</p>

</blockquote>

<p>There are no cemented optical groups in the thin T-E to separate.</p>

<p>At this focal length, f/4 or even f/3.5 is too slow for me personally. (Remember you need higher shutter speeds than you can get away with shorter lenses.) If you're sure you don't need more lens<br>

speed, just get a 40.5 to 43 or 49mm step-up ring.</p>

<p>Hey Knut, great picture. I don't normally like telephoto portraits, but that is fantastic.</p>

<p>Cheers</p>

<p>Alan</p>