Where have all the Focal-reducers gone? (with apologies)

Started 5 months ago | Discussions thread
Tom Caldwell
Forum ProPosts: 17,791
Like?
Re: Out taking photos with them? :-)
In reply to Habs Fan27, 5 months ago

Habs Fan27 wrote:

boardsy wrote:

Habs Fan27 wrote:

Are any of these photos cropped? I was thinking of getting an FD Lens Turbo but many people have said that you only get good sharpness in the 1/3rd around the center.

I have a recently acquired 24mm f2 FD . From what I have read, the corners will be no better than the SEL 16 pancake and probably worse with the LT

I haven't done a lot of shooting at 24mm + LT, but with good FDn's - 35/2, 50/1.4, 100/2.8 - I get good sharpness to the edges, much better than i expected to be honest and i would have happily lived with soft edges. I guess the FDn's are just that good! The robin is almost 100% crop, but the others aren't, except the portrait architectural shot, which had a very minor crop around +7 barrel distortion correction to straighten the lines - you can see it's sharp right into the corner at f5.6 on the FDn 50/1.4!

-- hide signature --

Regards,
Alan
my Flickr

OK, thanks for the reply. It sounds like like the LT is very lens specific. Many seem to have good success with it using the 50mm f1.4. I used to have the SSC version of this lens. Never really like 50mm on APS-C I find it both too long and too short but would be great with LT.

I might see if I can get a used LT to try out then. I'd like to try it with my 85mm as well. I don't think it will work well with the 24mm f2.

Ask willym he may have one to sell.

Seriously, the issues seem to be that if you have a great lens then the focal reducer will enhance its performance.  If your lens has problems then it will enhance them as well.  The focal reducer don't fix duff lenses, they make them worse.  Furthermore a FF capable lens is often using the best part of the image circle to make an aps-c image.  The softest part of the lens might not be seen until the focal reducer jacks the lens up to FF image capture on aps-c.  If the lens just happens to be soft around the edges then the focal reducer will show that where it might never have been seen before.

Alan shows that Focal Reducer adapters are not necessarily poor performers per se.

Furthermore these adapters are made without reference  to any specific lens and can be used with 1,001 varieties of lenses by users quite randomly outside the Focal reducer manufacturers control.

I think it is fair comment that the blue spot is now recognised as a ghost reflection of the sensor off a flat surface inside the lens that is mounted.  Usually possible because when the lenses were made they were made for film use and film is not nearly as reflective as a sensor.

-- hide signature --

Tom Caldwell

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow