Guillaume Zuili said:I have for years an Apo-Germinar W 240 in Copal 3. I use it for 8x10 with a lot of coverage.
I can only say that these lenses are outstanding.
Alexz said:Kerry, regarding the shutters, I would have to acquire new shutter also, not only the scale. Also, I'll have SK Grimes to fix the scale on the shutter. So in my case, the total (lens + shutter and necessary work) may easily reach 600$...
kthalmann said:I'd also like to call on the collective wisdom of the APUG membership regarding the coverage of the 600mm and 750mm APO Germinars. Thanks to Arne and his articles on these lenses I know what the official specs are. I know that based on these specs the 600mm will cover 7x17 with some left over for movements, but just miss the corners of 8x20 and that the 750mm should cover 12x20 with about an inch or so left over for front rise/shift. However, it has been my experience with other lenses originally targeted at the demanding reprographics industry (APO Artars, APO Ronars, G Clarons, etc.) that the official specs are often very conservative. Those using these lenses for pictorial use (usually involving some type of contact printing) often find they cover considerably more than the official spec would indicate.
So, if anyone has any first hand knowledge of the actual usable coverage of the 600mm and 750mm APO Germinars, please share your experiences here. I don't want to oversell the capbilities of these lenses, but I also don't want any 8x20 or 12x20 users to pass on them due to overly conservative manufacturers specs.
Thanks,
Kerry
acroell said:Kerry, in addition to the official 46° coverage specs (calculates to 510mm diameter for the 600mm lens, 636mm for the 750mm lens, and 850mm for the 1000mm lens, all at infinity) there are the mysterious "infinity" circles published in a single typed page by Docter: 585mm for the 600mm lens (52°), 715mm for the 750mm lens (51°), 895mm for the 1000mm one (48°) - this is supposedly all for the barrel versions wide open (!) at f/9. Stopped down, the coverage increases a little further to values up to 57°.
Disclaimer: I have not tested these values, these are values from an old Docter leaflet.
Bob Eskridge said:Frankly, since practically no long lenses for large format are presently being manufactured now-a-days, I can see the values of all of them rising over time. I believe they are good investment. There willl always be plenty of hobbyists interested in the larger formats and even that interest appears to be growing.
kthalmann said:Arne,
<snip>
As I know of nobody currently shooting with anything larger than 20x24, there is little point in quibbling over the coverage of the 1000mm APO Germinar. It doesn't really matter if it covers 46 degrees, 48 degrees or 53 degrees, the true coverage can be summed up in one word: "enough".
For the 750mm, even if we are fairly conservative, it should cover 16x20 with quite a bit to spare. The real question with the 750 then becomes, can it cover 20x24. It sounds like it's real close and will depend on how far it is stopped down, and what the performance is near the limits of it's coverage.
<snip>
TheFlyingCamera said:Kerry- I would be interested in either the 600mm or 750mm, price dependent of course. I'm looking at building my own 12x20 portrait camera and that about fits the bill.
pelerin said:Hi,
I am interested in 750 or perhaps the 1000 depending on price. Do you know the diameter of the flange? Does it fit within the dimensions of a Sinar size board? Thanks.
Celac.
I would be interested in the Germinar lenses probably in the 150-240 range as well as the 600 assuming it can be mounted in a shutter.kthalmann said:Earlier this year, I sold several (there was a url link here which no longer exists), (there was a url link here which no longer exists) and (there was a url link here which no longer exists) lenses here on APUG..........
So, if you're interested, let me know. I'll tally the response over the next week or so and make a decision.
Thanks,
Kerry
kthalmann said:Arne,
While the 61 degree spec may seem quite high for an Artar type lens, Fuji lists the coverage of their 300mm f8.5 C as 66 degrees. They are a bit more conservative with the 450mm (57 degrees) and 600mm (55 degree) C series lenses. These are also 4 element air-spaced designs based on the classic Celor/Artar design.
Kerry
kthalmann said:Celac,
Here is the info on the mounting thread diameters for the longer lenses:
600mm = 90mm rear thread diameter
750mm = 110mm rear thread diameter
1000mm = 110mm rear thread diameter
All three lenses will fit on standard Sinar boards and mounting flange rings will be included in price of the lenses.
Kerry
claytume said:Kerry
do you have weights for the long lenses?.........my main interest is the 1000.
Clayton
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